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171-396: A rocket (from Italian : rocchetto , lit.   ''bobbin/spool'', and so named for its shape) is a vehicle that uses jet propulsion to accelerate without using any surrounding air . A rocket engine produces thrust by reaction to exhaust expelled at high speed. Rocket engines work entirely from propellant carried within the vehicle; therefore a rocket can fly in

342-464: A rocket if it is unguided. Anti-tank and anti-aircraft missiles use rocket engines to engage targets at high speed at a range of several miles, while intercontinental ballistic missiles can be used to deliver multiple nuclear warheads from thousands of miles, and anti-ballistic missiles try to stop them. Rockets have also been tested for reconnaissance , such as the Ping-Pong rocket , which

513-689: A local language of Italy , most frequently the language spoken at home in their place of origin. Italian is a major language in Europe, being one of the official languages of the Organization for Security and Co-operation in Europe and one of the working languages of the Council of Europe . It is the third-most-widely spoken native language in the European Union (13% of the EU population) and it

684-417: A multi-stage rocket , and also pioneered the concept of a rocket launch pad (a rocket standing upright against a tall building before launch having been slowly rolled into place) and the rocket-launch countdown clock. The Guardian film critic Stephen Armstrong states Lang "created the rocket industry". Lang was inspired by the 1923 book The Rocket into Interplanetary Space by Hermann Oberth, who became

855-564: A nozzle . They may also have one or more rocket engines , directional stabilization device(s) (such as fins , vernier engines or engine gimbals for thrust vectoring , gyroscopes ) and a structure (typically monocoque ) to hold these components together. Rockets intended for high speed atmospheric use also have an aerodynamic fairing such as a nose cone , which usually holds the payload. As well as these components, rockets can have any number of other components, such as wings ( rocketplanes ), parachutes , wheels ( rocket cars ), even, in

1026-413: A rocket engine in the form of a fluid jet to produce thrust . For chemical rockets often the propellants are a fuel such as liquid hydrogen or kerosene burned with an oxidizer such as liquid oxygen or nitric acid to produce large volumes of very hot gas. The oxidiser is either kept separate and mixed in the combustion chamber, or comes premixed, as with solid rockets. Sometimes the propellant

1197-475: A vehicle may usefully employ for propulsion, such as in space. In these circumstances, it is necessary to carry all the propellant to be used. However, they are also useful in other situations: Some military weapons use rockets to propel warheads to their targets. A rocket and its payload together are generally referred to as a missile when the weapon has a guidance system (not all missiles use rocket engines, some use other engines such as jets ) or as

1368-484: A book in which he discussed the use of multiple rocket launching apparatus. In 1815 Alexander Dmitrievich Zasyadko constructed rocket-launching platforms, which allowed rockets to be fired in salvos (6 rockets at a time), and gun-laying devices. William Hale in 1844 greatly increased the accuracy of rocket artillery. Edward Mounier Boxer further improved the Congreve rocket in 1865. William Leitch first proposed

1539-414: A cardboard tube filled with black powder , but to make an efficient, accurate rocket or missile involves overcoming a number of difficult problems. The main difficulties include cooling the combustion chamber, pumping the fuel (in the case of a liquid fuel), and controlling and correcting the direction of motion. Rockets consist of a propellant , a place to put propellant (such as a propellant tank ), and

1710-432: A chemical reaction is initiated between the fuel and the oxidizer in the combustion chamber, and the resultant hot gases accelerate out of a rocket engine nozzle (or nozzles ) at the rearward-facing end of the rocket. The acceleration of these gases through the engine exerts force ("thrust") on the combustion chamber and nozzle, propelling the vehicle (according to Newton's Third Law ). This actually happens because

1881-417: A crane. This is generally not practical for larger space vehicles, which are assembled off the pad and moved into place on the launch site by various methods. NASA's Apollo / Saturn V crewed Moon landing vehicle, and Space Shuttle , were assembled vertically onto mobile launcher platforms with attached launch umbilical towers, in a Vehicle Assembly Building , and then a special crawler-transporter moved

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2052-499: A decomposing monopropellant ) that emit a hot exhaust gas . A rocket engine can use gas propellants, solid propellant , liquid propellant , or a hybrid mixture of both solid and liquid . Some rockets use heat or pressure that is supplied from a source other than the chemical reaction of propellant(s), such as steam rockets , solar thermal rockets , nuclear thermal rocket engines or simple pressurized rockets such as water rocket or cold gas thrusters . With combustive propellants

2223-510: A dragon's head with an open mouth. The British scientist and historian Joseph Needham points out that the written material and depicted illustration of this rocket come from the oldest stratum of the Huolongjing , which can be dated roughly 1300–1350 AD (from the book's part 1, chapter 3, page 23). Another example of an early multistaged rocket is the Juhwa (走火) of Korean development. It

2394-524: A failed launch. A successful escape of a crewed capsule occurred when Soyuz T-10 , on a mission to the Salyut 7 space station , exploded on the pad. Solid rocket propelled ejection seats are used in many military aircraft to propel crew away to safety from a vehicle when flight control is lost. A model rocket is a small rocket designed to reach low altitudes (e.g., 100–500 m (330–1,640 ft) for 30 g (1.1 oz) model) and be recovered by

2565-435: A fixed location on the ground, but would also be possible from an aircraft or ship. Rocket launch technologies include the entire set of systems needed to successfully launch a vehicle, not just the vehicle itself, but also the firing control systems , mission control center , launch pad , ground stations , and tracking stations needed for a successful launch or recovery or both. These are often collectively referred to as

2736-638: A guided rocket during World War I . Archibald Low stated "...in 1917 the Experimental Works designed an electrically steered rocket… Rocket experiments were conducted under my own patents with the help of Cdr. Brock ." The patent "Improvements in Rockets" was raised in July 1918 but not published until February 1923 for security reasons. Firing and guidance controls could be either wire or wireless. The propulsion and guidance rocket eflux emerged from

2907-560: A high pressure combustion chamber . These nozzles turn the hot gas from the combustion chamber into a cooler, hypersonic , highly directed jet of gas, more than doubling the thrust and raising the engine efficiency from 2% to 64%. His use of liquid propellants instead of gunpowder greatly lowered the weight and increased the effectiveness of rockets. In 1921, the Soviet research and development laboratory Gas Dynamics Laboratory began developing solid-propellant rockets , which resulted in

3078-408: A higher cost for deployment. Hot-staging is a type of rocket staging in which the next stage fires its engines before separation instead of after. During hot-staging, the earlier stage throttles down its engines. Hot-staging may reduce the complexity of stage separation, and gives a small extra payload capacity to the booster. It also eliminates the need for ullage motors , as the acceleration from

3249-415: A higher specific impulse means a more efficient rocket engine, capable of burning for longer periods of time. In terms of staging, the initial rocket stages usually have a lower specific impulse rating, trading efficiency for superior thrust in order to quickly push the rocket into higher altitudes. Later stages of the rocket usually have a higher specific impulse rating because the vehicle is further outside

3420-565: A huge number of civil servants and soldiers recruited from all over the country introduced many more words and idioms from their home languages— ciao is derived from the Venetian word s-cia[v]o ("slave", that is "your servant"), panettone comes from the Lombard word panetton , etc. Only 2.5% of Italy's population could speak the Italian standardized language properly when

3591-453: A limitation imposed by the laws of physics on the velocity change achievable by a rocket stage. The limit depends on the fueled-to-dry mass ratio and on the effective exhaust velocity of the engine. This relation is given by the classical rocket equation : where: The delta v required to reach low Earth orbit (or the required velocity of a sufficiently heavy suborbital payload) requires a wet to dry mass ratio larger than has been achieved in

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3762-471: A little over one million people in the United States speak Italian at home. Nevertheless, an Italian language media market does exist in the country. In Canada, Italian is the second most spoken non-official language when varieties of Chinese are not grouped together, with 375,645 claiming Italian as their mother tongue in 2016. Italian immigrants to South America have also brought a presence of

3933-441: A mission is the burn time, which is the amount of time the rocket engine will last before it has exhausted all of its propellant. For most non-final stages, thrust and specific impulse can be assumed constant, which allows the equation for burn time to be written as: Where m 0 {\displaystyle m_{\mathrm {0} }} and m f {\displaystyle m_{\mathrm {f} }} are

4104-472: A multistage rocket introduces additional risk into the success of the launch mission. Reducing the number of separation events results in a reduction in complexity . Separation events occur when stages or strap-on boosters separate after use, when the payload fairing separates prior to orbital insertion, or when used, a launch escape system which separates after the early phase of a launch. Pyrotechnic fasteners , or in some cases pneumatic systems like on

4275-658: A poetic and literary origin in the works of Tuscan writers of the 12th century, and, although the grammar and core lexicon are basically unchanged from those used in Florence in the 13th century, the modern standard of the language was largely shaped by relatively recent events. However, Romance vernacular as language spoken in the Italian Peninsula has a longer history. In fact, the earliest surviving texts that can definitely be called vernacular (as distinct from its predecessor Vulgar Latin) are legal formulae known as

4446-540: A pointed tip traveling at high speeds, model rocketry historically has proven to be a very safe hobby and has been credited as a significant source of inspiration for children who eventually become scientists and engineers . Hobbyists build and fly a wide variety of model rockets. Many companies produce model rocket kits and parts but due to their inherent simplicity some hobbyists have been known to make rockets out of almost anything. Rockets are also used in some types of consumer and professional fireworks . A water rocket

4617-613: A rail at extremely high speed. The world record for this is Mach 8.5. Larger rockets are normally launched from a launch pad that provides stable support until a few seconds after ignition. Due to their high exhaust velocity—2,500 to 4,500 m/s (9,000 to 16,200 km/h; 5,600 to 10,100 mph)—rockets are particularly useful when very high speeds are required, such as orbital speed at approximately 7,800 m/s (28,000 km/h; 17,000 mph). Spacecraft delivered into orbital trajectories become artificial satellites , which are used for many commercial purposes. Indeed, rockets remain

4788-692: A reference to 1264, recording that the "ground-rat", a type of firework , had frightened the Empress-Mother Gongsheng at a feast held in her honor by her son the Emperor Lizong . Subsequently, rockets are included in the military treatise Huolongjing , also known as the Fire Drake Manual, written by the Chinese artillery officer Jiao Yu in the mid-14th century. This text mentions the first known multistage rocket ,

4959-417: A renewed interest in linguistics in the 16th century, sparked a debate that raged throughout Italy concerning the criteria that should govern the establishment of a modern Italian literary and spoken language. This discussion, known as questione della lingua (i.e., the problem of the language ), ran through the Italian culture until the end of the 19th century, often linked to the political debate on achieving

5130-522: A result. Starting in late medieval times in much of Europe and the Mediterranean, Latin was replaced as the primary commercial language by languages of Italy, especially Tuscan and Venetian. These varieties were consolidated during the Renaissance with the strength of Italy and the rise of humanism and the arts . Italy came to enjoy increasing artistic prestige within Europe. A mark of

5301-466: A rocket system will be when performing optimizations and comparing varying configurations for a mission. For initial sizing, the rocket equations can be used to derive the amount of propellant needed for the rocket based on the specific impulse of the engine and the total impulse required in N·s. The equation is: where g is the gravity constant of Earth. This also enables the volume of storage required for

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5472-502: A sense, a person ( rocket belt ). Vehicles frequently possess navigation systems and guidance systems that typically use satellite navigation and inertial navigation systems . Rocket engines employ the principle of jet propulsion . The rocket engines powering rockets come in a great variety of different types; a comprehensive list can be found in the main article, Rocket engine . Most current rockets are chemically powered rockets (usually internal combustion engines , but some employ

5643-536: A seven-vowel system, consisting of /a, ɛ, e, i, ɔ, o, u/ , as well as 23 consonants. Compared with most other Romance languages, Italian phonology is conservative, preserving many words nearly unchanged from Vulgar Latin . Some examples: Multistage rocket By jettisoning stages when they run out of propellant, the mass of the remaining rocket is decreased. Each successive stage can also be optimized for its specific operating conditions, such as decreased atmospheric pressure at higher altitudes. This staging allows

5814-479: A single language is that they have evolved so that they are no longer mutually intelligible ; this diagnostic is effective if mutual intelligibility is minimal or absent (e.g. in Romance, Romanian and Portuguese), but it fails in cases such as Spanish-Portuguese or Spanish-Italian, as educated native speakers of either pairing can understand each other well if they choose to do so; however, the level of intelligibility

5985-402: A single rocket stage. The multistage rocket overcomes this limit by splitting the delta-v into fractions. As each lower stage drops off and the succeeding stage fires, the rest of the rocket is still traveling near the burnout speed. Each lower stage's dry mass includes the propellant in the upper stages, and each succeeding upper stage has reduced its dry mass by discarding the useless dry mass of

6156-453: A solid combination of fuel with oxidizer ( solid fuel ), or solid fuel with liquid or gaseous oxidizer ( hybrid propellant system ). Chemical rockets store a large amount of energy in an easily released form, and can be very dangerous. However, careful design, testing, construction and use minimizes risks. In China, gunpowder -powered rockets evolved in medieval China under the Song dynasty by

6327-399: A technical algorithm that generates an analytical solution that can be implemented by a program, or simple trial and error. For the trial and error approach, it is best to begin with the final stage, calculating the initial mass which becomes the payload for the previous stage. From there it is easy to progress all the way down to the initial stage in the same manner, sizing all the stages of

6498-513: A united Italian state. Renaissance scholars divided into three main factions: A fourth faction claimed that the best Italian was the one that the papal court adopted, which was a mixture of the Tuscan and Roman dialects. Eventually, Bembo's ideas prevailed, and the foundation of the Accademia della Crusca in Florence (1582–1583), the official legislative body of the Italian language, led to

6669-723: A variety of means. According to the United States National Association of Rocketry (nar) Safety Code, model rockets are constructed of paper, wood, plastic and other lightweight materials. The code also provides guidelines for motor use, launch site selection, launch methods, launcher placement, recovery system design and deployment and more. Since the early 1960s, a copy of the Model Rocket Safety Code has been provided with most model rocket kits and motors. Despite its inherent association with extremely flammable substances and objects with

6840-427: Is 89% with French, 87% with Catalan , 85% with Sardinian , 82% with Spanish, 80% with Portuguese , 78% with Ladin , 77% with Romanian . Estimates may differ according to sources. One study, analyzing the degree of differentiation of Romance languages in comparison to Latin (comparing phonology , inflection , discourse , syntax , vocabulary , and intonation ), estimated that distance between Italian and Latin

7011-483: Is a commonly used rocket system to attain Earth orbit. The spacecraft uses three distinct stages to provide propulsion consecutively in order to achieve orbital velocity. It is intermediate between a four-stage-to-orbit launcher and a two-stage-to-orbit launcher. Other designs (in fact, most modern medium- to heavy-lift designs) do not have all three stages inline on the main stack, instead having strap-on boosters for

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7182-415: Is a safe and reasonable assumption to say that 91 to 94 percent of the total mass is fuel. It is also important to note there is a small percentage of "residual" propellant that will be left stuck and unusable inside the tank, and should also be taken into consideration when determining amount of fuel for the rocket. A common initial estimate for this residual propellant is five percent. With this ratio and

7353-415: Is a type of model rocket using water as its reaction mass. The pressure vessel (the engine of the rocket) is usually a used plastic soft drink bottle. The water is forced out by a pressurized gas, typically compressed air. It is an example of Newton's third law of motion. The scale of amateur rocketry can range from a small rocket launched in one's own backyard to a rocket that reached space. Amateur rocketry

7524-759: Is also spoken by a minority in Monaco and France, especially in the southeastern part of the country. Italian was the official language in Savoy and in Nice until 1860, when they were both annexed by France under the Treaty of Turin , a development that triggered the " Niçard exodus ", or the emigration of a quarter of the Niçard Italians to Italy, and the Niçard Vespers . Giuseppe Garibaldi complained about

7695-453: Is generally assembled at its manufacturing site and shipped to the launch site; the term vehicle assembly refers to the mating of all rocket stage(s) and the spacecraft payload into a single assembly known as a space vehicle . Single-stage vehicles ( suborbital ), and multistage vehicles on the smaller end of the size range, can usually be assembled directly on the launch pad by lifting the stage(s) and spacecraft vertically in place by means of

7866-534: Is higher than that between Sardinian and Latin. In particular, its vowels are the second-closest to Latin after Sardinian . As in most Romance languages, stress is distinctive. Italian is the official language of Italy and San Marino and is spoken fluently by the majority of the countries' populations. Italian is the third most spoken language in Switzerland (after German and French; see Swiss Italian ), although its use there has moderately declined since

8037-577: Is impractical to directly compare the rocket's certain trait with the same trait of another because their individual attributes are often not independent of one another. For this reason, dimensionless ratios have been designed to enable a more meaningful comparison between rockets. The first is the initial to final mass ratio, which is the ratio between the rocket stage's full initial mass and the rocket stage's final mass once all of its fuel has been consumed. The equation for this ratio is: Where m E {\displaystyle m_{\mathrm {E} }}

8208-428: Is intermediate between a five-stage-to-orbit launcher and a three-stage-to-orbit launcher, most often used with solid-propellant launch systems. Other designs do not have all four stages inline on the main stack, instead having strap-on boosters for the "stage-0" with three core stages. In these designs, the boosters and first stage fire simultaneously instead of consecutively, providing extra initial thrust to lift

8379-404: Is less necessary, a pressurised fluid is used as propellant that simply escapes the spacecraft through a propelling nozzle. The first liquid-fuel rocket , constructed by Robert H. Goddard , differed significantly from modern rockets. The rocket engine was at the top and the fuel tank at the bottom of the rocket, based on Goddard's belief that the rocket would achieve stability by "hanging" from

8550-460: Is markedly lower between Italian-Spanish, and considerably higher between the Iberian sister languages of Portuguese-Spanish. Speakers of this latter pair can communicate with one another with remarkable ease, each speaking to the other in his own native language without slang/jargon. Nevertheless, on the basis of accumulated differences in morphology, syntax, phonology, and to some extent lexicon, it

8721-454: Is not burned but still undergoes a chemical reaction, and can be a 'monopropellant' such as hydrazine , nitrous oxide or hydrogen peroxide that can be catalytically decomposed to hot gas. Alternatively, an inert propellant can be used that can be externally heated, such as in steam rocket , solar thermal rocket or nuclear thermal rockets . For smaller, low performance rockets such as attitude control thrusters where high performance

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8892-462: Is not difficult to identify that for the Romance varieties of Italy, the first extant written evidence of languages that can no longer be considered Latin comes from the ninth and tenth centuries C.E. These written sources demonstrate certain vernacular characteristics and sometimes explicitly mention the use of the vernacular in Italy. Full literary manifestations of the vernacular began to surface around

9063-427: Is repeated until the desired final velocity is achieved. In some cases with serial staging, the upper stage ignites before the separation—the interstage ring is designed with this in mind, and the thrust is used to help positively separate the two vehicles. Only multistage rockets have reached orbital speed . Single-stage-to-orbit designs are sought, but have not yet been demonstrated. Multi-stage rockets overcome

9234-553: Is split into three categories according to total engine impulse : low-power, mid-power, and high-power . Hydrogen peroxide rockets are used to power jet packs , and have been used to power cars and a rocket car holds the all time (albeit unofficial) drag racing record. Corpulent Stump is the most powerful non-commercial rocket ever launched on an Aerotech engine in the United Kingdom. Launches for orbital spaceflights , or into interplanetary space , are usually from

9405-594: Is spoken as a second language by 13.4 million EU citizens (3%). Including Italian speakers in non-EU European countries (such as Switzerland, Albania and the United Kingdom ) and on other continents, the total number of speakers is approximately 85 million. Italian is the main working language of the Holy See , serving as the lingua franca (common language) in the Roman Catholic hierarchy as well as

9576-514: Is the empty mass of the stage, m p {\displaystyle m_{\mathrm {p} }} is the mass of the propellant, and m P L {\displaystyle m_{\mathrm {PL} }} is the mass of the payload. The second dimensionless performance quantity is the structural ratio, which is the ratio between the empty mass of the stage, and the combined empty mass and propellant mass as shown in this equation: The last major dimensionless performance quantity

9747-402: Is the mass of the oxidizer and m f u e l {\displaystyle m_{\mathrm {fuel} }} is the mass of the fuel. This mixture ratio not only governs the size of each tank, but also the specific impulse of the rocket. Determining the ideal mixture ratio is a balance of compromises between various aspects of the rocket being designed, and can vary depending on

9918-455: Is the payload ratio, which is the ratio between the payload mass and the combined mass of the empty rocket stage and the propellant: After comparing the three equations for the dimensionless quantities, it is easy to see that they are not independent of each other, and in fact, the initial to final mass ratio can be rewritten in terms of structural ratio and payload ratio: These performance ratios can also be used as references for how efficient

10089-549: Is used, and the town of Chipilo near Puebla, Mexico; each continues to use a derived form of Venetian dating back to the 19th century. Other examples are Cocoliche , an Italian–Spanish pidgin once spoken in Argentina and especially in Buenos Aires , and Lunfardo . The Rioplatense Spanish dialect of Argentina and Uruguay today has thus been heavily influenced by both standard Italian and Italian regional languages as

10260-509: The Il Globo (Australia) and the La gazzetta del Sud Africa (South Africa). Italian is widely taught in many schools around the world, but rarely as the first foreign language. In the 21st century, technology also allows for the continual spread of the Italian language, as people have new ways to learn how to speak, read, and write languages at their own pace and at any given time. For example,

10431-991: The La Voce del Popolo ( Croatia ), the Corriere d'Italia (Germany), the L'italoeuropeo (United Kingdom), the Passaparola ( Luxembourg ), the America Oggi (United States), the Corriere Canadese and the Corriere Italiano (Canada), the Il punto d'incontro (Mexico), the L'Italia del Popolo ( Argentina ), the Fanfulla (Brazil), the Gente d'Italia ( Uruguay ), the La Voce d'Italia ( Venezuela ),

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10602-493: The 'fire-dragon issuing from the water' (Huo long chu shui), thought to have been used by the Chinese navy. Medieval and early modern rockets were used militarily as incendiary weapons in sieges . Between 1270 and 1280, Hasan al-Rammah wrote al-furusiyyah wa al-manasib al-harbiyya ( The Book of Military Horsemanship and Ingenious War Devices ), which included 107 gunpowder recipes, 22 of them for rockets. In Europe, Roger Bacon mentioned firecrackers made in various parts of

10773-480: The Falcon 9 Full Thrust , are typically used to separate rocket stages. A two-stage-to-orbit ( TSTO ) or two-stage rocket launch vehicle is a spacecraft in which two distinct stages provide propulsion consecutively in order to achieve orbital velocity. It is intermediate between a three-stage-to-orbit launcher and a hypothetical single-stage-to-orbit (SSTO) launcher. The three-stage-to-orbit launch system

10944-702: The Gallo-Italic linguistic panorama of Northern Italy , the Italo-Dalmatian , Neapolitan and its related dialects were largely unaffected by the Franco- Occitan influences introduced to Italy mainly by bards from France during the Middle Ages, but after the Norman conquest of southern Italy , Sicily became the first Italian land to adopt Occitan lyric moods (and words) in poetry. Even in

11115-674: The Kingdom of Italy in the Dodecanese ). Italian is widely spoken in Malta , where nearly two-thirds of the population can speak it fluently (see Maltese Italian ). Italian served as Malta's official language until 1934, when it was abolished by the British colonial administration amid strong local opposition. Italian language in Slovenia is an officially recognized minority language in

11286-773: The Kingdom of Lombardy–Venetia ), although the masses kept speaking primarily their local vernaculars. Italian was also one of the many recognised languages in the Austro-Hungarian Empire . Italy has always had a distinctive dialect for each city because the cities, until recently, were thought of as city-states . Those dialects now have considerable variety . As Tuscan-derived Italian came to be used throughout Italy, features of local speech were naturally adopted, producing various versions of Regional Italian . The most characteristic differences, for instance, between Roman Italian and Milanese Italian are syntactic gemination of initial consonants in some contexts and

11457-1033: The Middle Ages , the established written language in Europe was Latin, although the great majority of people were illiterate, and only few were well versed in the language. In the Italian Peninsula , as in most of Europe, most would instead speak a local vernacular. These dialects, as they are commonly referred to, evolved from Vulgar Latin over the course of centuries, unaffected by formal standards and teachings. They are not in any sense "dialects" of standard Italian, which itself started off as one of these local tongues, but sister languages of Italian. Mutual intelligibility with Italian varies widely, as it does with Romance languages in general. The Romance languages of Italy can differ greatly from Italian at all levels ( phonology , morphology , syntax , lexicon , pragmatics ) and are classified typologically as distinct languages. The standard Italian language has

11628-554: The Placiti Cassinesi from the province of Benevento that date from 960 to 963, although the Veronese Riddle , probably from the 8th or early 9th century, contains a late form of Vulgar Latin that can be seen as a very early sample of a vernacular dialect of Italy. The Commodilla catacomb inscription is also a similar case. The Italian language has progressed through a long and slow process, which started after

11799-734: The RTV-G-4 Bumper rockets tested at the White Sands Proving Ground and later at Cape Canaveral from 1948 to 1950. These consisted of a V-2 rocket and a WAC Corporal sounding rocket. The greatest altitude ever reached was 393 km, attained on February 24, 1949, at White Sands. In 1947, the Soviet rocket engineer and scientist Mikhail Tikhonravov developed a theory of parallel stages, which he called "packet rockets". In his scheme, three parallel stages were fired from liftoff , but all three engines were fueled from

11970-555: The Saturn V and Soyuz , have launch escape systems . This is a small, usually solid rocket that is capable of pulling the crewed capsule away from the main vehicle towards safety at a moments notice. These types of systems have been operated several times, both in testing and in flight, and operated correctly each time. This was the case when the Safety Assurance System (Soviet nomenclature) successfully pulled away

12141-456: The Singijeon , or 'magical machine arrows' in the 16th century. The earliest experiments with multistage rockets in Europe were made in 1551 by Austrian Conrad Haas (1509–1576), the arsenal master of the town of Hermannstadt , Transylvania (now Sibiu/Hermannstadt, Romania). This concept was developed independently by at least five individuals: The first high-speed multistage rockets were

12312-438: The Soviet and U.S. space programs, were not passivated after mission completion. During the initial attempts to characterize the space debris problem, it became evident that a good proportion of all debris was due to the breaking up of rocket upper stages, particularly unpassivated upper-stage propulsion units. An illustration and description in the 14th century Chinese Huolongjing by Jiao Yu and Liu Bowen shows

12483-773: The Vulgar Latin of the Roman Empire . Italian is the least divergent language from Latin , together with Sardinian (meaning that Italian and Sardinian are the most conservative Romance languages). Spoken by about 85 million people, including 67 million native speakers (2024), Italian is an official language in Italy , San Marino , Switzerland ( Ticino and the Grisons ), Corsica , and Vatican City . It has official minority status in Croatia , Slovenian Istria , and

12654-528: The Western Roman Empire's fall in the 5th century. The language that came to be thought of as Italian developed in central Tuscany and was first formalized in the early 14th century through the works of Tuscan writer Dante Alighieri , written in his native Florentine . Dante's epic poems, known collectively as the Commedia , to which another Tuscan poet Giovanni Boccaccio later affixed

12825-543: The vacuum of space. Rockets work more efficiently in a vacuum and incur a loss of thrust due to the opposing pressure of the atmosphere. Multistage rockets are capable of attaining escape velocity from Earth and therefore can achieve unlimited maximum altitude. Compared with airbreathing engines , rockets are lightweight and powerful and capable of generating large accelerations . To control their flight, rockets rely on momentum , airfoils , auxiliary reaction engines , gimballed thrust , momentum wheels , deflection of

12996-492: The " ground segment ". Orbital launch vehicles commonly take off vertically, and then begin to progressively lean over, usually following a gravity turn trajectory. Italian language Italian ( italiano , pronounced [itaˈljaːno] , or lingua italiana , pronounced [ˈliŋɡwa itaˈljaːna] ) is a Romance language of the Indo-European language family that evolved from

13167-523: The "stage-0" with two core stages. In these designs, the boosters and first stage fire simultaneously instead of consecutively, providing extra initial thrust to lift the full launcher weight and overcome gravity losses and atmospheric drag. The boosters are jettisoned a few minutes into flight to reduce weight. The four-stage-to-orbit launch system is a rocket system used to attain Earth orbit. The spacecraft uses four distinct stages to provide propulsion consecutively in order to achieve orbital velocity. It

13338-532: The 111 Italian lecturer sections belonging to foreign schools where Italian is taught as a language of culture. As of 2022, Australia had the highest number of students learning Italian in the world. This occurred because of support by the Italian community in Australia and the Italian Government and also because of successful educational reform efforts led by local governments in Australia. From

13509-510: The 13th century in the form of various religious texts and poetry. Although these are the first written records of Italian varieties separate from Latin, the spoken language had probably diverged long before the first written records appeared since those who were literate generally wrote in Latin even if they spoke other Romance varieties in person. Throughout the 19th and 20th centuries, the use of Standard Italian became increasingly widespread and

13680-568: The 13th century. They also developed an early form of multiple rocket launcher during this time. The Mongols adopted Chinese rocket technology and the invention spread via the Mongol invasions to the Middle East and to Europe in the mid-13th century. According to Joseph Needham, the Song navy used rockets in a military exercise dated to 1245. Internal-combustion rocket propulsion is mentioned in

13851-562: The 1970s. It is official both on the national level and on regional level in two cantons : Ticino and Grisons . In the latter canton, however, it is only spoken by a small minority, in the Italian Grisons . Ticino, which includes Lugano , the largest Italian-speaking city outside Italy, is the only canton where Italian is predominant. Italian is also used in administration and official documents in Vatican City . Italian

14022-417: The Italian dialects has declined in the modern era , as Italy unified under Standard Italian and continues to do so aided by mass media from newspapers to radio to television, diglossia is still frequently encountered in Italy and triglossia is not uncommon in emigrant communities among older speakers. Both situations normally involve some degree of code-switching and code-mixing . Notes: Italian has

14193-489: The Italian language into a lingua franca used not only among clerks, nobility, and functionaries in the Italian courts but also by the bourgeoisie . Italian literature's first modern novel, I promessi sposi ( The Betrothed ) by Alessandro Manzoni , further defined the standard by "rinsing" his Milanese "in the waters of the Arno " ( Florence 's river), as he states in the preface to his 1840 edition. After unification,

14364-571: The L3 capsule during three of the four failed launches of the Soviet Moon rocket, N1 vehicles 3L, 5L and 7L . In all three cases the capsule, albeit uncrewed, was saved from destruction. Only the three aforementioned N1 rockets had functional Safety Assurance Systems. The outstanding vehicle, 6L , had dummy upper stages and therefore no escape system giving the N1 booster a 100% success rate for egress from

14535-556: The Mediterranean. The increasing political and cultural relevance of Florence during the periods of the rise of the Medici Bank , humanism , and the Renaissance made its dialect, or rather a refined version of it, a standard in the arts. The Renaissance era, known as il Rinascimento in Italian, was seen as a time of rebirth, which is the literal meaning of both renaissance (from French) and rinascimento (Italian). During this time, long-existing beliefs stemming from

14706-571: The Soviet Katyusha rocket in the artillery role, and the American anti tank bazooka projectile. These used solid chemical propellants. The Americans captured a large number of German rocket scientists , including Wernher von Braun, in 1945, and brought them to the United States as part of Operation Paperclip . After World War II scientists used rockets to study high-altitude conditions, by radio telemetry of temperature and pressure of

14877-778: The Soviet Union ( Vostok , Soyuz , Proton ) and in the United States (e.g. the X-15 ). Rockets came into use for space exploration . American crewed programs ( Project Mercury , Project Gemini and later the Apollo programme ) culminated in 1969 with the first crewed landing on the Moon – using equipment launched by the Saturn V rocket. Rocket vehicles are often constructed in the archetypal tall thin "rocket" shape that takes off vertically, but there are actually many different types of rockets including: A rocket design can be as simple as

15048-462: The atmosphere and the exhaust gas does not need to expand against as much atmospheric pressure. When selecting the ideal rocket engine to use as an initial stage for a launch vehicle, a useful performance metric to examine is the thrust-to-weight ratio, and is calculated by the equation: The common thrust-to-weight ratio of a launch vehicle is within the range of 1.3 to 2.0. Another performance metric to keep in mind when designing each rocket stage in

15219-689: The atmosphere, detection of cosmic rays , and further techniques; note too the Bell X-1 , the first crewed vehicle to break the sound barrier (1947). Independently, in the Soviet Union's space program research continued under the leadership of the chief designer Sergei Korolev (1907–1966). During the Cold War rockets became extremely important militarily with the development of modern intercontinental ballistic missiles (ICBMs). The 1960s saw rapid development of rocket technology, particularly in

15390-401: The breakup of a single upper stage while in orbit. After the 1990s, spent upper stages are generally passivated after their use as a launch vehicle is complete in order to minimize risks while the stage remains derelict in orbit . Passivation means removing any sources of stored energy remaining on the vehicle, as by dumping fuel or discharging batteries. Many early upper stages, in both

15561-444: The case of Northern Italian languages, however, scholars are careful not to overstate the effects of outsiders on the natural indigenous developments of the languages. The economic might and relatively advanced development of Tuscany at the time ( Late Middle Ages ) gave its language weight, although Venetian remained widespread in medieval Italian commercial life, and Ligurian (or Genoese) remained in use in maritime trade alongside

15732-653: The colonial period. In the early 19th century, Eritrea was the country with the highest number of Italians abroad, and the Italian Eritreans grew from 4,000 during World War I to nearly 100,000 at the beginning of World War II. In Asmara there are two Italian schools, the Italian School of Asmara (Italian primary school with a Montessori department) and the Liceo Sperimentale "G. Marconi" (Italian international senior high school). Italian

15903-586: The concept of using rockets to enable human spaceflight in 1861. Leitch's rocket spaceflight description was first provided in his 1861 essay "A Journey Through Space", which was later published in his book God's Glory in the Heavens (1862). Konstantin Tsiolkovsky later (in 1903) also conceived this idea, and extensively developed a body of theory that has provided the foundation for subsequent spaceflight development. The British Royal Flying Corps designed

16074-573: The country (some 0.42% of the total population). Their numbers dropped dramatically after World War II following the Istrian–Dalmatian exodus , which caused the emigration of between 230,000 and 350,000 Istrian Italians and Dalmatian Italians. Italian was the official language of the Republic of Ragusa from 1492 to 1807. It formerly had official status in Albania due to the annexation of

16245-518: The country to the Kingdom of Italy (1939–1943). Albania has a large population of non-native speakers, with over half of the population having some knowledge of the Italian language. The Albanian government has pushed to make Italian a compulsory second language in schools. The Italian language is well-known and studied in Albania, due to its historical ties and geographical proximity to Italy and to

16416-446: The country. A few hundred Italian settlers returned to Libya in the 2000s. Italian was the official language of Eritrea during Italian colonisation . Italian is today used in commerce, and it is still spoken especially among elders; besides that, Italian words are incorporated as loan words in the main language spoken in the country (Tigrinya). The capital city of Eritrea, Asmara , still has several Italian schools, established during

16587-525: The country. The official census, carried out in 2002, reported 2,258 ethnic Italians ( Istrian Italians ) in Slovenia (0.11% of the total population). Italian language in Croatia is an official minority language in the country, with many schools and public announcements published in both languages. The 2001 census in Croatia reported 19,636 ethnic Italians (Istrian Italians and Dalmatian Italians ) in

16758-409: The deflecting cowl at the nose. In 1920, Professor Robert Goddard of Clark University published proposed improvements to rocket technology in A Method of Reaching Extreme Altitudes . In 1923, Hermann Oberth (1894–1989) published Die Rakete zu den Planetenräumen ( The Rocket into Planetary Space ). Modern rockets originated in 1926 when Goddard attached a supersonic ( de Laval ) nozzle to

16929-464: The design and fashion industries, in some sports such as football and especially in culinary terms. In Italy, almost all the other languages spoken as the vernacular —other than standard Italian and some languages spoken among immigrant communities—are often called " Italian dialects ", a label that can be very misleading if it is understood to mean "dialects of Italian". The Romance dialects of Italy are local evolutions of spoken Latin that pre-date

17100-419: The different stages of the rocket should be clearly defined. Continuing with the previous example, the end of the first stage which is sometimes referred to as 'stage 0', can be defined as when the side boosters separate from the main rocket. From there, the final mass of stage one can be considered the sum of the empty mass of stage one, the mass of stage two (the main rocket and the remaining unburned fuel) and

17271-588: The diffusion of Italian television in the country. Due to heavy Italian influence during the Italian colonial period , Italian is still understood by some in former colonies such as Libya. Although it was the primary language in Libya since colonial rule , Italian greatly declined under the rule of Muammar Gaddafi , who expelled the Italian Libyan population and made Arabic the sole official language of

17442-404: The drawbacks of a less efficient specific impulse rating. But suppose the defining constraint for the launch system is volume, and a low density fuel is required such as hydrogen. This example would be solved by using an oxidizer-rich mixture ratio, reducing efficiency and specific impulse rating, but will meet a smaller tank volume requirement. The ultimate goal of optimal staging is to maximize

17613-478: The educated gentlemen was to make the Grand Tour , visiting Italy to see its great historical monuments and works of art. It was expected that the visitor would learn at least some Italian, understood as language based on Florentine. In England, while the classical languages Latin and Greek were the first to be learned, Italian became the second most common modern language after French, a position it held until

17784-400: The end of the rocket stage's motion, as the vehicle will still have a velocity that will allow it to coast upward for a brief amount of time until the acceleration of the planet's gravity gradually changes it to a downward direction. The velocity and altitude of the rocket after burnout can be easily modeled using the basic physics equations of motion. When comparing one rocket with another, it

17955-422: The engine like a pendulum in flight. However, the rocket veered off course and crashed 184 feet (56 m) away from the launch site , indicating that the rocket was no more stable than one with the rocket engine at the base. Rockets or other similar reaction devices carrying their own propellant must be used when there is no other substance (land, water, or air) or force ( gravity , magnetism , light ) that

18126-598: The entire vehicle stack to the launch pad in an upright position. In contrast, vehicles such as the Russian Soyuz rocket and the SpaceX Falcon 9 are assembled horizontally in a processing hangar, transported horizontally, and then brought upright at the pad. Spent upper stages of launch vehicles are a significant source of space debris remaining in orbit in a non-operational state for many years after use, and occasionally, large debris fields created from

18297-411: The equations for determining the burnout velocities, burnout times, burnout altitudes, and mass of each stage. This would make for a better approach to a conceptual design in a situation where a basic understanding of the system behavior is preferential to a detailed, accurate design. One important concept to understand when undergoing restricted rocket staging, is how the burnout velocity is affected by

18468-462: The establishment of Italian, and as such are sister languages to the Tuscan that was the historical source of Italian. They can be quite different from Italian and from each other, with some belonging to different linguistic branches of Romance. The only exceptions to this are twelve groups considered " historical language minorities ", which are officially recognized as distinct minority languages by

18639-608: The exhaust stream , propellant flow, spin , or gravity . Rockets for military and recreational uses date back to at least 13th-century China . Significant scientific, interplanetary and industrial use did not occur until the 20th century, when rocketry was the enabling technology for the Space Age , including setting foot on the Moon . Rockets are now used for fireworks , missiles and other weaponry , ejection seats , launch vehicles for artificial satellites , human spaceflight , and space exploration . Chemical rockets are

18810-433: The fact that it was linguistically an intermediate between the northern and the southern Italian dialects. Thus the dialect of Florence became the basis for what would become the official language of Italy. Italian was progressively made an official language of most of the Italian states predating unification, slowly replacing Latin, even when ruled by foreign powers (such as Spain in the Kingdom of Naples , or Austria in

18981-696: The film's scientific adviser and later an important figure in the team that developed the V-2 rocket. The film was thought to be so realistic that it was banned by the Nazis when they came to power for fear it would reveal secrets about the V-2 rockets. In 1943 production of the V-2 rocket began in Germany. It was designed by the Peenemünde Army Research Center with Wernher von Braun serving as

19152-457: The first launch in 1928, which flew for approximately 1,300 metres. These rockets were used in 1931 for the world's first successful use of rockets for jet-assisted takeoff of aircraft and became the prototypes for the Katyusha rocket launcher , which were used during World War II . In 1929, Fritz Lang 's German science fiction film Woman in the Moon was released. It showcased the use of

19323-486: The first stage of the American Atlas I and Atlas II launch vehicles, arranged in a row, used parallel staging in a similar way: the outer pair of booster engines existed as a jettisonable pair which would, after they shut down, drop away with the lowermost outer skirt structure, leaving the central sustainer engine to complete the first stage's engine burn towards apogee or orbit. Separation of each portion of

19494-558: The first successful iron-cased rockets, developed in the late 18th century in the Kingdom of Mysore (part of present-day India) under the rule of Hyder Ali . The Congreve rocket was a British weapon designed and developed by Sir William Congreve in 1804. This rocket was based directly on the Mysorean rockets, used compressed powder and was fielded in the Napoleonic Wars . It was Congreve rockets to which Francis Scott Key

19665-409: The force (pressure times area) on the combustion chamber wall is unbalanced by the nozzle opening; this is not the case in any other direction. The shape of the nozzle also generates force by directing the exhaust gas along the axis of the rocket. Rocket propellant is mass that is stored, usually in some form of propellant tank or casing, prior to being used as the propulsive mass that is ejected from

19836-476: The free website and application Duolingo has 4.94 million English speakers learning the Italian language. According to the Italian Ministry of Foreign Affairs , every year there are more than 200,000 foreign students who study the Italian language; they are distributed among the 90 Institutes of Italian Culture that are located around the world, in the 179 Italian schools located abroad, or in

20007-467: The fuel to be calculated if the density of the fuel is known, which is almost always the case when designing the rocket stage. The volume is yielded when dividing the mass of the propellant by its density. Asides from the fuel required, the mass of the rocket structure itself must also be determined, which requires taking into account the mass of the required thrusters, electronics, instruments, power equipment, etc. These are known quantities for typical off

20178-405: The initial and final masses of the rocket stage respectively. In conjunction with the burnout time, the burnout height and velocity are obtained using the same values, and are found by these two equations: When dealing with the problem of calculating the total burnout velocity or time for the entire rocket system, the general procedure for doing so is as follows: The burnout time does not define

20349-489: The island of Corsica (but not in the neighbouring Sardinia , which on the contrary underwent Italianization well into the late 18th century, under Savoyard sway: the island's linguistic composition, roofed by the prestige of Spanish among the Sardinians , would therein make for a rather slow process of assimilation to the Italian cultural sphere ). The rediscovery of Dante's De vulgari eloquentia , as well as

20520-640: The language to that continent. According to some sources, Italian is the second most spoken language in Argentina after the official language of Spanish, although its number of speakers, mainly of the older generation, is decreasing. Italian bilingual speakers can be found scattered across the Southeast of Brazil as well as in the South. In Venezuela , Italian is the most spoken language after Spanish and Portuguese, with around 200,000 speakers. In Uruguay , people who speak Italian as their home language are 1.1% of

20691-443: The largest rocket ever to do so, as well as the first reusable vehicle to utilize hot staging. A rocket system that implements tandem staging means that each individual stage runs in order one after the other. The rocket breaks free from the previous stage, then begins burning through the next stage in straight succession. On the other hand, a rocket that implements parallel staging has two or more different stages that are active at

20862-498: The late 18th century when it tended to be replaced by German. John Milton , for instance, wrote some of his early poetry in Italian. Within the Catholic Church , Italian is known by a large part of the ecclesiastical hierarchy and is used in substitution for Latin in some official documents. Italian loanwords continue to be used in most languages in matters of art and music (especially classical music including opera), in

21033-534: The late 19th to the mid-20th century, millions of Italians settled in Argentina, Uruguay, Southern Brazil and Venezuela, as well as in Canada and the United States, where they formed a physical and cultural presence. In some cases, colonies were established where variants of regional languages of Italy were used, and some continue to use this regional language. Examples are Rio Grande do Sul , Brazil, where Talian

21204-567: The law. On the other hand, Corsican (a language spoken on the French island of Corsica ) is closely related to medieval Tuscan , from which Standard Italian derives and evolved. The differences in the evolution of Latin in the different regions of Italy can be attributed to the natural changes that all languages in regular use are subject to, and to some extent to the presence of three other types of languages: substrata, superstrata, and adstrata . The most prevalent were substrata (the language of

21375-403: The mass of the payload. High-altitude and space-bound upper stages are designed to operate with little or no atmospheric pressure. This allows the use of lower pressure combustion chambers and engine nozzles with optimal vacuum expansion ratios . Some upper stages, especially those using hypergolic propellants like Delta-K or Ariane 5 ES second stage, are pressure fed , which eliminates

21546-464: The mass of the propellant calculated, the mass of the empty rocket weight can be determined. Sizing rockets using a liquid bipropellant requires a slightly more involved approach because there are two separate tanks that are required: one for the fuel, and one for the oxidizer. The ratio of these two quantities is known as the mixture ratio, and is defined by the equation: Where m o x {\displaystyle m_{\mathrm {ox} }}

21717-482: The most common type of high power rocket, typically creating a high speed exhaust by the combustion of fuel with an oxidizer . The stored propellant can be a simple pressurized gas or a single liquid fuel that disassociates in the presence of a catalyst ( monopropellant ), two liquids that spontaneously react on contact ( hypergolic propellants ), two liquids that must be ignited to react (like kerosene (RP1) and liquid oxygen, used in most liquid-propellant rockets ),

21888-820: The municipalities of Santa Tereza and Encantado in Brazil . Italian is also spoken by large immigrant and expatriate communities in the Americas and Australia . Italian is included under the languages covered by the European Charter for Regional or Minority Languages in Bosnia and Herzegovina and in Romania , although Italian is neither a co-official nor a protected language in these countries. Some speakers of Italian are native bilinguals of both Italian (either in its standard form or regional varieties ) and

22059-412: The nation was unified in 1861. Italian is a Romance language , a descendant of Vulgar Latin (colloquial spoken Latin). Standard Italian is based on Tuscan , especially its Florentine dialect , and is, therefore, an Italo-Dalmatian language , a classification that includes most other central and southern Italian languages and the extinct Dalmatian . According to Ethnologue , lexical similarity

22230-566: The nearly spent stage keeps the propellants settled at the bottom of the tanks. Hot-staging is used on Soviet-era Russian rockets such as Soyuz and Proton-M . The N1 rocket was designed to use hot staging, however none of the test flights lasted long enough for this to occur. Starting with the Titan II, the Titan family of rockets used hot staging. SpaceX retrofitted their Starship rocket to use hot staging after its first flight , making it

22401-708: The need for complex turbopumps . Other upper stages, such as the Centaur or DCSS , use liquid hydrogen expander cycle engines, or gas generator cycle engines like the Ariane 5 ECA's HM7B or the S-IVB 's J-2 . These stages are usually tasked with completing orbital injection and accelerating payloads into higher energy orbits such as GTO or to escape velocity . Upper stages, such as Fregat , used primarily to bring payloads from low Earth orbit to GTO or beyond are sometimes referred to as space tugs . Each individual stage

22572-408: The number of printing presses in Italy grew rapidly and by the year 1500 reached a total of 56, the biggest number of printing presses in all of Europe. This enabled the production of more pieces of literature at a lower cost and Italian, as the dominant language, spread. Italian became the language used in the courts of every state in the Italian Peninsula , as well as the prestige variety used on

22743-419: The number of stages that split up the rocket system. Increasing the number of stages for a rocket while keeping the specific impulse, payload ratios and structural ratios constant will always yield a higher burnout velocity than the same systems that use fewer stages. However, the law of diminishing returns is evident in that each increment in number of stages gives less of an improvement in burnout velocity than

22914-590: The official language of the Sovereign Military Order of Malta . Italian has a significant use in musical terminology and opera with numerous Italian words referring to music that have become international terms taken into various languages worldwide. Almost all native Italian words end with vowels , and the language has a 7-vowel sound system ('e' and 'o' have mid-low and mid-high sounds). Italian has contrast between short and long consonants and gemination (doubling) of consonants. During

23085-399: The oldest known multistage rocket; this was the " fire-dragon issuing from the water " (火龙出水, huǒ lóng chū shuǐ), which was used mostly by the Chinese navy. It was a two-stage rocket that had booster rockets that would eventually burn out, yet, before they did so, automatically ignited a number of smaller rocket arrows that were shot out of the front end of the missile, which was shaped like

23256-478: The only way to launch spacecraft into orbit and beyond. They are also used to rapidly accelerate spacecraft when they change orbits or de-orbit for landing . Also, a rocket may be used to soften a hard parachute landing immediately before touchdown (see retrorocket ). Rockets were used to propel a line to a stricken ship so that a Breeches buoy can be used to rescue those on board. Rockets are also used to launch emergency flares . Some crewed rockets, notably

23427-630: The openness of vowels, the length of the consonants, and influence of the local language (for example, in informal situations andà , annà and nare replace the standard Italian andare in the area of Tuscany, Rome and Venice respectively for the infinitive "to go"). There is no definitive date when the various Italian variants of Latin—including varieties that contributed to modern Standard Italian—began to be distinct enough from Latin to be considered separate languages. One criterion for determining that two language variants are to be considered separate languages rather than variants of

23598-584: The original inhabitants), as the Italian dialects were most probably simply Latin as spoken by native cultural groups. Superstrata and adstrata were both less important. Foreign conquerors of Italy that dominated different regions at different times left behind little to no influence on the dialects. Foreign cultures with which Italy engaged in peaceful relations with, such as trade, had no significant influence either. Throughout Italy, regional varieties of Standard Italian, called Regional Italian , are spoken. Regional differences can be recognized by various factors:

23769-458: The other hand, almost everyone still speaks the Corsican idiom , which, due to its linguistic proximity to the Italian standard language, appears both linguistically as an Italian dialect and therefore as a carrier of Italian culture, despite the French government's decades-long efforts to cut Corsica off from the Italian motherland. Italian was the official language in Monaco until 1860, when it

23940-525: The outer two stages, until they are empty and could be ejected. This is more efficient than sequential staging, because the second-stage engine is never just dead weight. In 1951, Soviet engineer and scientist Dmitry Okhotsimsky carried out a pioneering engineering study of general sequential and parallel staging, with and without the pumping of fuel between stages. The design of the R-7 Semyorka emerged from that study. The trio of rocket engines used in

24111-632: The overall payload ratio of the entire system. It is important to note that when computing payload ratio for individual stages, the payload includes the mass of all the stages after the current one. The overall payload ratio is: Where n is the number of stages the rocket system comprises. Similar stages yielding the same payload ratio simplify this equation, however that is seldom the ideal solution for maximizing payload ratio, and ΔV requirements may have to be partitioned unevenly as suggested in guideline tips 1 and 2 from above. Two common methods of determining this perfect ΔV partition between stages are either

24282-573: The payload ratio (see ratios under performance), meaning the largest amount of payload is carried up to the required burnout velocity using the least amount of non-payload mass, which comprises everything else. This goal assumes that the cost of a rocket launch is proportional to the total liftoff mass of the rocket, which is a rule of thumb in rocket engineering. Here are a few quick rules and guidelines to follow in order to reach optimal staging: The payload ratio can be calculated for each individual stage, and when multiplied together in sequence, will yield

24453-406: The population of Italy could speak Standard Italian. He reports that in 1951 that percentage had risen to 87%. The ability to speak Italian did not necessarily mean it was in everyday use, and most people (63.5%) still usually spoke their native dialects. In addition, other factors such as mass emigration, industrialization, and urbanization, and internal migrations after World War II , contributed to

24624-402: The previous increment. The burnout velocity gradually converges towards an asymptotic value as the number of stages increases towards a very high number. In addition to diminishing returns in burnout velocity improvement, the main reason why real world rockets seldom use more than three stages is because of increase of weight and complexity in the system for each added stage, ultimately yielding

24795-469: The proliferation of Standard Italian. The Italians who emigrated during the Italian diaspora beginning in 1861 were often of the uneducated lower class, and thus the emigration had the effect of increasing the percentage of literates, who often knew and understood the importance of Standard Italian, back home in Italy. A large percentage of those who had emigrated also eventually returned to Italy, often more educated than when they had left. Although use of

24966-528: The pronunciation of stressed "e", and of "s" between vowels in many words: e.g. va bene "all right" is pronounced [vabˈbɛːne] by a Roman (and by any standard Italian speaker), [vaˈbeːne] by a Milanese (and by any speaker whose native dialect lies to the north of the La Spezia–Rimini Line ); a casa "at home" is [akˈkaːsa] for Roman, [akˈkaːsa] or [akˈkaːza] for standard, [aˈkaːza] for Milanese and generally northern. In contrast to

25137-415: The publication of Agnolo Monosini 's Latin tome Floris italicae linguae libri novem in 1604 followed by the first Italian dictionary in 1612. An important event that helped the diffusion of Italian was the conquest and occupation of Italy by Napoleon in the early 19th century (who was himself of Italian-Corsican descent). This conquest propelled the unification of Italy some decades after and pushed

25308-487: The referendum that allowed France to annex Savoy and Nice, and a group of his followers (among the Italian Savoyards ) took refuge in Italy in the following years. Corsica passed from the Republic of Genoa to France in 1769 after the Treaty of Versailles . Italian was the official language of Corsica until 1859. Giuseppe Garibaldi called for the inclusion of the " Corsican Italians " within Italy when Rome

25479-427: The rocket system. Restricted rocket staging is based on the simplified assumption that each of the stages of the rocket system have the same specific impulse, structural ratio, and payload ratio, the only difference being the total mass of each increasing stage is less than that of the previous stage. Although this assumption may not be the ideal approach to yielding an efficient or optimal system, it greatly simplifies

25650-518: The same time. For example, the Space Shuttle has two Solid Rocket Boosters that burn simultaneously. Upon launch, the boosters ignite, and at the end of the stage, the two boosters are discarded while the external fuel tank is kept for another stage. Most quantitative approaches to the design of the rocket system's performance are focused on tandem staging, but the approach can be easily modified to include parallel staging. To begin with,

25821-416: The savings are so great that every rocket ever used to deliver a payload into orbit has had staging of some sort. One of the most common measures of rocket efficiency is its specific impulse, which is defined as the thrust per flow rate (per second) of propellant consumption: When rearranging the equation such that thrust is calculated as a result of the other factors, we have: These equations show that

25992-518: The shelf hardware that should be considered in the mid to late stages of the design, but for preliminary and conceptual design, a simpler approach can be taken. Assuming one engine for a rocket stage provides all of the total impulse for that particular segment, a mass fraction can be used to determine the mass of the system. The mass of the stage transfer hardware such as initiators and safe-and-arm devices are very small by comparison and can be considered negligible. For modern day solid rocket motors, it

26163-557: The similarity in shape to the bobbin or spool used to hold the thread from a spinning wheel. Leonhard Fronsperger and Conrad Haas adopted the Italian term into German in the mid-16th century; "rocket" appears in English by the early 17th century. Artis Magnae Artilleriae pars prima , an important early modern work on rocket artillery , by Casimir Siemienowicz , was first printed in Amsterdam in 1650. The Mysorean rockets were

26334-414: The spent lower stages. A further advantage is that each stage can use a different type of rocket engine, each tuned for its particular operating conditions. Thus the lower-stage engines are designed for use at atmospheric pressure, while the upper stages can use engines suited to near vacuum conditions. Lower stages tend to require more structure than upper as they need to bear their own weight plus that of

26505-486: The stages above them. Optimizing the structure of each stage decreases the weight of the total vehicle and provides further advantage. The advantage of staging comes at the cost of the lower stages lifting engines which are not yet being used, as well as making the entire rocket more complex and harder to build than a single stage. In addition, each staging event is a possible point of launch failure, due to separation failure, ignition failure, or stage collision. Nevertheless,

26676-473: The teachings of the Roman Catholic Church began to be understood from new perspectives as humanists —individuals who placed emphasis on the human body and its full potential—began to shift focus from the church to human beings themselves. The continual advancements in technology play a crucial role in the diffusion of languages. After the invention of the printing press in the 15th century,

26847-547: The technical director. The V-2 became the first artificial object to travel into space by crossing the Kármán line with the vertical launch of MW 18014 on 20 June 1944. Doug Millard, space historian and curator of space technology at the Science Museum, London , where a V-2 is exhibited in the main exhibition hall, states: "The V-2 was a quantum leap of technological change. We got to the Moon using V-2 technology but this

27018-445: The thrust of the remaining stages to more easily accelerate the rocket to its final velocity and height. In serial or tandem staging schemes, the first stage is at the bottom and is usually the largest, the second stage and subsequent upper stages are above it, usually decreasing in size. In parallel staging schemes solid or liquid rocket boosters are used to assist with launch. These are sometimes referred to as "stage 0". In

27189-469: The title Divina , were read throughout the peninsula and his written dialect became the "canonical standard" that all educated Italians could understand. Dante is still credited with standardizing the Italian language. In addition to the widespread exposure gained through literature, the Florentine dialect also gained prestige due to the political and cultural significance of Florence at the time and

27360-542: The total population of the country. In Australia, Italian is the second most spoken foreign language after Chinese, with 1.4% of the population speaking it as their home language. The main Italian-language newspapers published outside Italy are the L'Osservatore Romano ( Vatican City ), the L'Informazione di San Marino ( San Marino ), the Corriere del Ticino and the laRegione Ticino ( Switzerland ),

27531-406: The type of fuel and oxidizer combination being used. For example, a mixture ratio of a bipropellant could be adjusted such that it may not have the optimal specific impulse, but will result in fuel tanks of equal size. This would yield simpler and cheaper manufacturing, packing, configuring, and integrating of the fuel systems with the rest of the rocket, and can become a benefit that could outweigh

27702-459: The typical case, the first-stage and booster engines fire to propel the entire rocket upwards. When the boosters run out of fuel, they are detached from the rest of the rocket (usually with some kind of small explosive charge or explosive bolts ) and fall away. The first stage then burns to completion and falls off. This leaves a smaller rocket, with the second stage on the bottom, which then fires. Known in rocketry circles as staging , this process

27873-593: The world in the Opus Majus of 1267. Between 1280 and 1300, the Liber Ignium gave instructions for constructing devices that are similar to firecrackers based on second hand accounts. Konrad Kyeser described rockets in his military treatise Bellifortis around 1405. Giovanni Fontana , a Paduan engineer in 1420, created rocket-propelled animal figures. The name "rocket" comes from the Italian rocchetta , meaning "bobbin" or "little spindle", given due to

28044-561: Was also introduced to Somalia through colonialism and was the sole official language of administration and education during the colonial period but fell out of use after government, educational and economic infrastructure were destroyed in the Somali Civil War . Italian is also spoken by large immigrant and expatriate communities in the Americas and Australia. Although over 17 million Americans are of Italian descent , only

28215-525: Was annexed to the Kingdom of Italy , but King Victor Emmanuel II did not agree to it. Italian is generally understood in Corsica by the population resident therein who speak Corsican , which is an Italo-Romance idiom similar to Tuscan. Francization occurred in Nice case, and caused a near-disappearance of the Italian language as many of the Italian speakers in these areas migrated to Italy. In Corsica, on

28386-444: Was launched to surveil enemy targets, however, recon rockets have never come into wide use in the military. Sounding rockets are commonly used to carry instruments that take readings from 50 kilometers (31 mi) to 1,500 kilometers (930 mi) above the surface of the Earth. The first images of Earth from space were obtained from a V-2 rocket in 1946 ( flight #13 ). Rocket engines are also used to propel rocket sleds along

28557-443: Was mirrored by a decline in the use of the dialects. An increase in literacy was one of the main driving factors (one can assume that only literates were capable of learning Standard Italian, whereas those who were illiterate had access only to their native dialect). The percentage of literates rose from 25% in 1861 to 60% in 1911, and then on to 78.1% in 1951. Tullio De Mauro , an Italian linguist, has asserted that in 1861 only 2.5% of

28728-515: Was proposed by medieval Korean engineer, scientist and inventor Ch'oe Mu-sŏn and developed by the Firearms Bureau (火㷁道監) during the 14th century. The rocket had the length of 15 cm and 13 cm; the diameter was 2.2 cm. It was attached to an arrow 110 cm long; experimental records show that the first results were around 200m in range. There are records that show Korea kept developing this technology until it came to produce

28899-419: Was referring, when he wrote of the "rockets' red glare" while held captive on a British ship that was laying siege to Fort McHenry in 1814. Together, the Mysorean and British innovations increased the effective range of military rockets from 100 to 2,000 yards (91 to 1,829 m). The first mathematical treatment of the dynamics of rocket propulsion is due to William Moore (1813). In 1814, Congreve published

29070-658: Was replaced by the French. This was due to the annexation of the surrounding County of Nice to France following the Treaty of Turin (1860) . It formerly had official status in Montenegro (because of the Venetian Albania ), parts of Slovenia and Croatia (because of the Venetian Istria and Venetian Dalmatia ), parts of Greece (because of the Venetian rule in the Ionian Islands and by

29241-591: Was technology that was developed with massive resources, including some particularly grim ones. The V-2 programme was hugely expensive in terms of lives, with the Nazis using slave labour to manufacture these rockets". In parallel with the German guided-missile programme, rockets were also used on aircraft , either for assisting horizontal take-off ( RATO ), vertical take-off ( Bachem Ba 349 "Natter") or for powering them ( Me 163 , see list of World War II guided missiles of Germany ). The Allies' rocket programs were less technological, relying mostly on unguided missiles like

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