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75-686: The RS-27 was a modified Rocketdyne H-1 built to power the first stage of the Saturn I and Saturn IB and replaced the MB-3 engine that had been used on previous versions of the Delta launcher. NASA had a large supply of surplus H-1 engines in the early 1970s, as the Apollo program was ending. In addition to its main engine, the RS-27 included two vernier engines to provide vehicle roll control during flight. RS-27

150-561: A blood alcohol concentration of 0.03-0.05 % and induces anesthetic coma at 0.4%. This use carries the high risk of deadly alcohol intoxication , pulmonary aspiration and vomit, which led to use of alternatives in antiquity, such as opium and cannabis , and later diethyl ether, starting in the 1840s. Ethanol is used as an antiseptic in medical wipes and hand sanitizer gels for its bactericidal and anti-fungal effects. Ethanol kills microorganisms by dissolving their membrane lipid bilayer and denaturing their proteins , and

225-414: A hydroxyl group ), which indicates that the carbon of a methyl group (CH 3 −) is attached to the carbon of a methylene group (−CH 2 –), which is attached to the oxygen of a hydroxyl group (−OH). It is a constitutional isomer of dimethyl ether . Ethanol is sometimes abbreviated as EtOH , using the common organic chemistry notation of representing the ethyl group (C 2 H 5 −) with Et . Ethanol

300-528: A psychoactive depressant , it is the active ingredient in alcoholic beverages , and the second most consumed drug globally behind caffeine . Ethanol is naturally produced by the fermentation process of sugars by yeasts or via petrochemical processes such as ethylene hydration. Historically it was used as a general anesthetic , and has modern medical applications as an antiseptic , disinfectant , solvent for some medications, and antidote for methanol poisoning and ethylene glycol poisoning . It

375-478: A cosmetic, and retained that meaning in Middle Latin . The use of 'alcohol' for ethanol (in full, "alcohol of wine") was first recorded in 1753. Before the late 18th century the term alcohol generally referred to any sublimated substance. Ethanol is the oldest known sedative , used as an oral general anesthetic during surgery in ancient Mesopotamia and in medieval times . Mild intoxication starts at

450-457: A fuel reduces harmful tailpipe emissions of carbon monoxide, particulate matter, oxides of nitrogen , and other ozone-forming pollutants. Argonne National Laboratory analyzed greenhouse gas emissions of many different engine and fuel combinations, and found that biodiesel /petrodiesel blend ( B20 ) showed a reduction of 8%, conventional E85 ethanol blend a reduction of 17% and cellulosic ethanol 64%, compared with pure gasoline. Ethanol has

525-503: A greater concentration of sucrose than corn (by about 30%), but is also much easier to extract. The bagasse generated by the process is not discarded, but burned by power plants to produce electricity. Bagasse burning accounts for around 9% of the electricity produced in Brazil. In the 1970s most industrial ethanol in the U.S. was made as a petrochemical, but in the 1980s the U.S. introduced subsidies for corn-based ethanol . According to

600-467: A heavy-lift vehicle able to lift 10,000 to 40,000 pounds into low Earth orbit (LEO), or accelerating 6,000 to 12,000 lb to escape velocity . Existing launchers might be extended to reach 10,000 lb to LEO, below the requirements. A new and larger design was needed, and in April 1957, Wernher von Braun handed the preliminary design task to Heinz-Hermann Koelle . Koelle's solution to reducing

675-469: A mission to flight-qualify them—but it could not be restarted in flight, because some components required for the startup sequence were non-reusable. In particular, the turbopumps were initially driven by a Solid Propellant Gas Generator (SPGG), which was essentially a small solid rocket and had to be replaced after each firing. To start the engine a 500V AC voltage was applied to the SPGG, which ignited

750-461: A much greater research octane number (RON) than gasoline, meaning it is less prone to pre-ignition, allowing for better ignition advance which means more torque, and efficiency in addition to the lower carbon emissions. Ethanol combustion in an internal combustion engine yields many of the products of incomplete combustion produced by gasoline and significantly larger amounts of formaldehyde and related species such as acetaldehyde. This leads to

825-509: A post-processing solvent to remove oils, waxes, and chlorophyll from solution in a process known as winterization . Ethanol is found in paints , tinctures, markers, and personal care products such as mouthwashes, perfumes and deodorants. Polysaccharides precipitate from aqueous solution in the presence of alcohol, and ethanol precipitation is used for this reason in the purification of DNA and RNA . Because of its low freezing point of −114 °C (−173 °F) and low toxicity, ethanol

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900-416: A significantly larger photochemical reactivity and more ground level ozone . This data has been assembled into The Clean Fuels Report comparison of fuel emissions and show that ethanol exhaust generates 2.14 times as much ozone as gasoline exhaust. When this is added into the custom Localized Pollution Index of The Clean Fuels Report, the local pollution of ethanol (pollution that contributes to smog)

975-400: A solvent is in making tincture of iodine, cough syrups, etc. It is also miscible with light aliphatic hydrocarbons, such as pentane and hexane , and with aliphatic chlorides such as trichloroethane and tetrachloroethylene . Ethanol's miscibility with water contrasts with the immiscibility of longer-chain alcohols (five or more carbon atoms), whose water miscibility decreases sharply as

1050-405: A temperature called its flash point and an ignition source is then applied to it. For 20% alcohol by mass (about 25% by volume), this will occur at about 25 °C (77 °F). The flash point of pure ethanol is 13 °C (55 °F), but may be influenced very slightly by atmospheric composition such as pressure and humidity. Ethanol mixtures can ignite below average room temperature. Ethanol

1125-505: Is a stub . You can help Misplaced Pages by expanding it . Rocketdyne H-1 The Rocketdyne H-1 was a 205,000 lbf (910 kN) thrust liquid-propellant rocket engine burning LOX and RP-1 . The H-1 was developed for use in the S-I and S-IB first stages of the Saturn I and Saturn IB rockets, respectively, where it was used in clusters of eight engines. After the Apollo program, surplus H-1 engines were rebranded and reworked as

1200-557: Is a volatile, colorless liquid that has a slight odor. It burns with a smokeless blue flame that is not always visible in normal light. The physical properties of ethanol stem primarily from the presence of its hydroxyl group and the shortness of its carbon chain. Ethanol's hydroxyl group is able to participate in hydrogen bonding, rendering it more viscous and less volatile than less polar organic compounds of similar molecular weight, such as propane . Ethanol's adiabatic flame temperature for combustion in air is 2082 °C or 3779 °F. Ethanol

1275-447: Is an organic compound with the chemical formula CH 3 CH 2 OH . It is an alcohol , with its formula also written as C 2 H 5 OH , C 2 H 6 O or EtOH, where Et stands for ethyl . Ethanol is a volatile , flammable , colorless liquid with a characteristic wine -like odor and pungent taste. In nature, grape-sugar breaks up by the action of fermentation into alcohol or carbonic acid, without anything being added. As

1350-714: Is another potential source of ethanol, and is suitable for growing in dryland conditions. The International Crops Research Institute for the Semi-Arid Tropics is investigating the possibility of growing sorghum as a source of fuel, food, and animal feed in arid parts of Asia and Africa . Sweet sorghum has one-third the water requirement of sugarcane over the same time period. It also requires about 22% less water than corn. The world's first sweet sorghum ethanol distillery began commercial production in 2007 in Andhra Pradesh , India . Ethanol has been produced in

1425-563: Is as an engine fuel and fuel additive . Brazil in particular relies heavily upon the use of ethanol as an engine fuel, due in part to its role as one of the world's leading producers of ethanol. Gasoline sold in Brazil contains at least 25% anhydrous ethanol. Hydrous ethanol (about 95% ethanol and 5% water) can be used as fuel in more than 90% of new gasoline-fueled cars sold in the country. The US and many other countries primarily use E10 (10% ethanol, sometimes known as gasohol) and E85 (85% ethanol) ethanol/gasoline mixtures. Over time, it

1500-463: Is being conducted at a research level although there are a number of organizations at the beginning of the commercialization of ethanol fuel cells. Ethanol fireplaces can be used for home heating or for decoration. Ethanol can also be used as stove fuel for cooking. As a central nervous system depressant , ethanol is one of the most commonly consumed psychoactive drugs . Despite alcohol's psychoactive, addictive, and carcinogenic properties, it

1575-439: Is believed that a material portion of the ≈150-billion-US-gallon (570,000,000 m ) per year market for gasoline will begin to be replaced with fuel ethanol. Australian law limits the use of pure ethanol from sugarcane waste to 10 % in automobiles. Older cars (and vintage cars designed to use a slower burning fuel) should have the engine valves upgraded or replaced. According to an industry advocacy group , ethanol as

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1650-481: Is considered a flammable liquid (Class 3 Hazardous Material) in concentrations above 2.35% by mass (3.0% by volume; 6 proof ). Dishes using burning alcohol for culinary effects are called flambé . Ethanol is a byproduct of the metabolic process of yeast. As such, ethanol will be present in any yeast habitat. Ethanol can commonly be found in overripe fruit. Ethanol produced by symbiotic yeast can be found in bertam palm blossoms. Although some animal species, such as

1725-439: Is considered a universal solvent , as its molecular structure allows for the dissolving of both polar , hydrophilic and nonpolar , hydrophobic compounds. As ethanol also has a low boiling point , it is easy to remove from a solution that has been used to dissolve other compounds, making it a popular extracting agent for botanical oils. Cannabis oil extraction methods often use ethanol as an extraction solvent, and also as

1800-451: Is currently used in lightweight rocket-powered racing aircraft . Commercial fuel cells operate on reformed natural gas, hydrogen or methanol. Ethanol is an attractive alternative due to its wide availability, low cost, high purity and low toxicity. There is a wide range of fuel cell concepts that have entered trials including direct-ethanol fuel cells , auto-thermal reforming systems and thermally integrated systems. The majority of work

1875-410: Is effective against most bacteria , fungi and viruses . It is ineffective against bacterial spores , which can be treated with hydrogen peroxide . A solution of 70% ethanol is more effective than pure ethanol because ethanol relies on water molecules for optimal antimicrobial activity. Absolute ethanol may inactivate microbes without destroying them because the alcohol is unable to fully permeate

1950-429: Is less expensive and more readily available than fomepizole in the role. Ethanol is used to dissolve many water-insoluble medications and related compounds. Liquid preparations of pain medications , cough and cold medicines , and mouth washes, for example, may contain up to 25% ethanol and may need to be avoided in individuals with adverse reactions to ethanol such as alcohol-induced respiratory reactions . Ethanol

2025-433: Is more economical depends on prevailing prices of petroleum and grain feed stocks. World production of ethanol in 2006 was 51 gigalitres (1.3 × 10  US gal), with 69% of the world supply coming from Brazil and the U.S. Brazilian ethanol is produced from sugarcane, which has relatively high yields (830% more fuel than the fossil fuels used to produce it) compared to some other energy crops . Sugarcane not only has

2100-585: Is more economical. In an older process, first practiced on the industrial scale in 1930 by Union Carbide but now almost entirely obsolete, ethylene was hydrated indirectly by reacting it with concentrated sulfuric acid to produce ethyl sulfate , which was hydrolyzed to yield ethanol and regenerate the sulfuric acid: Ethanol in alcoholic beverages and fuel is produced by fermentation. Certain species of yeast (e.g., Saccharomyces cerevisiae ) metabolize sugar (namely polysaccharides ), producing ethanol and carbon dioxide. The chemical equations below summarize

2175-539: Is neither restartable nor throttleable . In addition to its main engine, it includes two vernier engines to provide vehicle roll control during flight. When used as the main booster propulsion system for the Delta II family of launch vehicles, has an operational duration of 265 seconds. The last RS-27A engine was used for the ICESat-2 launch on 15 September, 2018. This space - or spaceflight -related article

2250-459: Is present mainly as an antimicrobial preservative in over 700 liquid preparations of medicine including acetaminophen , iron supplements , ranitidine , furosemide , mannitol , phenobarbital , trimethoprim/sulfamethoxazole and over-the-counter cough medicine . Some medicinal solutions of ethanol are also known as tinctures . In mammals, ethanol is primarily metabolized in the liver and stomach by ADH enzymes. These enzymes catalyze

2325-537: Is rated 1.7, where gasoline is 1.0 and higher numbers signify greater pollution. The California Air Resources Board formalized this issue in 2008 by recognizing control standards for formaldehydes as an emissions control group, much like the conventional NOx and reactive organic gases (ROGs). More than 20% of Brazilian cars are able to use 100% ethanol as fuel, which includes ethanol-only engines and flex-fuel engines. Flex-fuel engines in Brazil are able to work with all ethanol, all gasoline or any mixture of both. In

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2400-457: Is readily available and legal for sale in many countries. There are laws regulating the sale, exportation/importation, taxation, manufacturing, consumption, and possession of alcoholic beverages. The most common regulation is prohibition for minors. Ethanol is an important industrial ingredient. It has widespread use as a precursor for other organic compounds such as ethyl halides , ethyl esters , diethyl ether, acetic acid, and ethyl amines . It

2475-463: Is slightly more refractive than water, having a refractive index of 1.36242 (at λ=589.3 nm and 18.35 °C or 65.03 °F). The triple point for ethanol is 150 ± 20 K . Ethanol is a versatile solvent, miscible with water and with many organic solvents, including acetic acid , acetone , benzene , carbon tetrachloride , chloroform , diethyl ether, ethylene glycol, glycerol , nitromethane , pyridine , and toluene . Its main use as

2550-414: Is sometimes used in laboratories (with dry ice or other coolants) as a cooling bath to keep vessels at temperatures below the freezing point of water. For the same reason, it is also used as the active fluid in alcohol thermometers . Ethanol is a 2-carbon alcohol . Its molecular formula is CH 3 CH 2 OH. The structure of the molecule of ethanol is CH 3 −CH 2 −OH (an ethyl group linked to

2625-431: Is used as a chemical solvent and in the synthesis of organic compounds, and as a fuel source for lamps, stoves, and internal combustion engines. Ethanol also can be dehydrated to make ethylene, an important chemical feedstock. As of 2023, world production of ethanol fuel was 29,590,000,000 US gallons (112.0 gigalitres), coming mostly from the U.S. (51%) and Brazil (26%). Ethanol is the systematic name defined by

2700-504: The International Union of Pure and Applied Chemistry for a compound consisting of an alkyl group with two carbon atoms (prefix "eth-"), having a single bond between them (infix "-an-") and an attached −OH functional group (suffix "-ol"). The "eth-" prefix and the qualifier "ethyl" in "ethyl alcohol" originally came from the name "ethyl" assigned in 1834 to the group C 2 H 5 − by Justus Liebig . He coined

2775-547: The SM-64 Navaho cruise missile project, which used the same engine as a booster to get the missile up to speed so its ramjet engines could light. The Air Force continually demanded higher performance from the Navaho, which forced NAA to build larger missiles, and larger boosters to launch it. By the early 1950s, the basic engine design had been enlarged to produce 120,000 lbf (530 kN). All of these designs, like

2850-419: The carburetor ) and attribute the damage to the increased water retention by ethanol in fuel. Ethanol was commonly used as fuel in early bipropellant rocket (liquid-propelled) vehicles, in conjunction with an oxidizer such as liquid oxygen. The German A-4 ballistic rocket of World War II (better known by its propaganda name V-2 ), which is credited as having begun the space age, used ethanol as

2925-407: The oxidation of ethanol into acetaldehyde (ethanal): When present in significant concentrations, this metabolism of ethanol is additionally aided by the cytochrome P450 enzyme CYP2E1 in humans, while trace amounts are also metabolized by catalase . The resulting intermediate, acetaldehyde, is a known carcinogen, and poses significantly greater toxicity in humans than ethanol itself. Many of

3000-449: The pentailed treeshrew , exhibit ethanol-seeking behaviors, most show no interest or avoidance of food sources containing ethanol. Ethanol is also produced during the germination of many plants as a result of natural anaerobiosis . Ethanol has been detected in outer space , forming an icy coating around dust grains in interstellar clouds . Minute quantity amounts (average 196 ppb ) of endogenous ethanol and acetaldehyde were found in

3075-584: The Air Force selected a JP-4 burning version of the engine to power their Atlas missile . The US Army requested a further boost to 150,000 lbf (670 kN) for their Jupiter missile, and the Air Force used the same version for their Thor , producing the Rocketdyne S-3D (or LR-79). All of these engines were based on a similar design concept, featuring a "waterfall injector", where many small fuel injectors were used to spray burning fuel into

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3150-502: The Renewable Fuels Association, as of 30 October 2007, 131 grain ethanol bio-refineries in the U.S. have the capacity to produce 7 × 10 ^  US gal (26,000,000 m ) of ethanol per year. An additional 72 construction projects underway (in the U.S.) can add 6.4 billion US gallons (24,000,000 m ) of new capacity in the next 18 months. In India ethanol is made from sugarcane. Sweet sorghum

3225-584: The Rocketdyne RS-27 engine with first usage on the Delta 2000 series in 1974. RS-27 engines continued to be used up until 1992 when the first version of the Delta II , Delta 6000, was retired. The RS-27A variant, boasting slightly upgraded performance, was also used on the later Delta II and Delta III rockets, with the former flying until 2018. The H-1 is one of a series of engines developed from

3300-606: The S-3D for the Thor and Jupiter, the company turned their attention to a radically updated version, originally known as the S-3X, but later becoming the X-1. This engine replaced the complex valve system and all of its attended sensors and electronics with new valves that operated on the pressure of the fuel itself. This meant that the complex start-up procedure was entirely automated and driven off

3375-516: The S-3D, they instead presented the X-1 and suggested it be used in place of a further upgrade to the S-3. Although experimental, the X-1 was already in the right thrust range and ready for full development. A contract for development was tendered on 15 August 1958, and by early 1959 the name had changed from Juno to Saturn, referring to the succession as the planet after Jupiter, the Jupiter missile being

3450-765: The US rocketry establishment. In order to demonstrate peaceful intent, the US decided to spin out its various non-military rocketry programs to a new agency, which would evolve as NASA . As the Army had lost interest in large rockets, they agreed to turn over von Braun's ABMA team to NASA, becoming the Marshall Space Flight Center . The handover would take place in 1960. Shortly after these plans were made, in July 1958 ARPA visited ABMA and told von Braun that they still had $ 10 million in their budget to spend before

3525-564: The United States, flex-fuel vehicles can run on 0% to 85% ethanol (15% gasoline) since higher ethanol blends are not yet allowed or efficient. Brazil supports this fleet of ethanol-burning automobiles with large national infrastructure that produces ethanol from domestically grown sugarcane. Ethanol's high miscibility with water makes it unsuitable for shipping through modern pipelines like liquid hydrocarbons. Mechanics have seen increased cases of damage to small engines (in particular,

3600-504: The V-2 engine using a new "waterfall" fuel injector. The Germans were unable to get the design to work and it never went into service. NAA engineers decided to attack this problem and quickly came up with solutions. This allowed them to raise the thrust of the design to 75,000 lbf (330 kN), and then 78,000 lbf (350 kN) for the Redstone missile . NAA had also been working on

3675-528: The V-2 that spawned them, burned ethanol , but other fuels had also been experimented with, including kerosene , diesel oil , paint thinner , JP-4 , and JP-5 jet fuel. In January 1953 Rocketdyne started their "REAP" program to convert these engines to a specific and well-engineered kerosene fuel specifically for rocket engines, which became RP-1 , officially specified in Military Specification MIL-R-25576 in 1954. In 1955,

3750-436: The X-1 could be started once only. Another change was to introduce an ignitor using a pyrophoric fuel in place of the solid fuel versions of earlier designs. The earlier engines required the ignitors to be inserted through holes in the engine into the combustion chamber, but the new system allowed the fuel to be sprayed into the main injector. The fuel, triethylaluminum , was delivered in a cube with diaphragms that burst when

3825-469: The characteristic alcohol flush reaction that can cause temporary reddening of the skin as well as a number of related, and often unpleasant, symptoms of acetaldehyde toxicity. This mutation is typically accompanied by another mutation in the ADH enzyme ADH1B in roughly 80 % of east Asians, which improves the catalytic efficiency of converting ethanol into acetaldehyde. The largest single use of ethanol

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3900-454: The composition of the ethanol-water azeotrope shifts to more ethanol-rich mixtures. The minimum-pressure azeotrope has an ethanol fraction of 100% and a boiling point of 306 K (33 °C), corresponding to a pressure of roughly 70  torr (9.333 kPa). Below this pressure, there is no azeotrope, and it is possible to distill absolute ethanol from an ethanol-water mixture. An ethanol–water solution will catch fire if heated above

3975-484: The development time was to use a cluster of fuel tanks from Redstone and Jupiter missiles, sit them on top of a single thrust plate, and then attach the required engines to the bottom of the plate. Calculations demonstrated that a total thrust of about 1 million pounds would be needed, greatly limiting their engine selection. Looking for suitable designs, Koelle learned of the E-1 from Rocketdyne's George Sutton. Rocketdyne

4050-414: The ethanol molecule also has a nonpolar end, it will also dissolve nonpolar substances, including most essential oils and numerous flavoring, coloring, and medicinal agents. The addition of even a few percent of ethanol to water sharply reduces the surface tension of water. This property partially explains the " tears of wine " phenomenon. When wine is swirled in a glass, ethanol evaporates quickly from

4125-429: The exhaled breath of healthy volunteers. Auto-brewery syndrome , also known as gut fermentation syndrome, is a rare medical condition in which intoxicating quantities of ethanol are produced through endogenous fermentation within the digestive system . Ethanol is produced both as a petrochemical , through the hydration of ethylene and, via biological processes, by fermenting sugars with yeast . Which process

4200-476: The fuel flow in the injector reached a set threshold. Finally, the X-1 introduced a new lubrication system that added a small amount of additive to the RP-1 fuel as it flowed through the various components. This was fed under pressure into the various bearings in the turbopump system, both lubricating it and carrying away heat. Saturn started as a paper project to meet a new US Department of Defense requirement for

4275-410: The fuel flow itself. Additionally, the X-1 removed the entire start tank system and replaced it with a small solid fuel rocket engine that fed its exhaust through the gas generator to spin the turbopumps. This change dramatically simplified engine plumbing, at the cost of making the design a single-shot device. Earlier engines could, in theory, be restarted in flight, but with a single starter cartridge,

4350-748: The handover, and asked if there was any way to effectively use the money. Von Braun called in Koelle and showed them a model of the Juno V, but the ARPA visitors noted that the E-1 engine wouldn't be ready by 1960. Brainstorming, they decided that the best approach was to make a minor upgrade to Rocketdyne's existing S-3D engines to boost them from 175,000 lbf (780 kN) to 200,000 lbf (890 kN), and use eight of these engines instead of four E-1s. When Koelle returned to Rocketdyne looking for an upgraded version of

4425-406: The laboratory by converting carbon dioxide via biological and electrochemical reactions. Ethanol can be produced from petrochemical feed stocks, primarily by the acid - catalyzed hydration of ethylene. It is often referred to as synthetic ethanol. The catalyst is most commonly phosphoric acid , adsorbed onto a porous support such as silica gel or diatomaceous earth . This catalyst

4500-408: The main combustion chamber. They also shared a complex system for starting the turbopumps , using a set of secondary fuel tanks and plumbing that fed the gas generator and main combustors while the pumps were still bringing the main fuel lines up to pressure. A complex series of electropneumatic valves operated the various fuel flows until the engine was fully started. With the successful running of

4575-450: The main constituent of B-Stoff . Under such nomenclature, the ethanol was mixed with 25% water to reduce the combustion chamber temperature. The V-2's design team helped develop U.S. rockets following World War II, including the ethanol-fueled Redstone rocket , which launched the first U.S. astronaut on suborbital spaceflight . Alcohols fell into general disuse as more energy-dense rocket fuels were developed, although ethanol

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4650-512: The microbe's membrane. Ethanol can also be used as a disinfectant and antiseptic by inducing cell dehydration through disruption of the osmotic balance across the cell membrane, causing water to leave the cell, leading to cell death. Ethanol may be administered as an antidote to ethylene glycol poisoning and methanol poisoning . It does so by acting as a competitive inhibitor against methanol and ethylene glycol for alcohol dehydrogenase (ADH). Though it has more side effects, ethanol

4725-409: The number of carbons increases. The miscibility of ethanol with alkanes is limited to alkanes up to undecane : mixtures with dodecane and higher alkanes show a miscibility gap below a certain temperature (about 13 °C for dodecane ). The miscibility gap tends to get wider with higher alkanes, and the temperature for complete miscibility increases. Ethanol-water mixtures have less volume than

4800-609: The previous ABMA design. Like all of Rocketdyne's early engines, the H-1 used a waterfall injector fed by turbopumps and regeneratively cooled the engine using the engine's fuel. The combustion chamber was made of 292 stainless steel tubes brazed in a furnace. Unlike the J-2 engine used on the S-IVB stage, the H-1 was a single-start engine. It could be fired multiple times—and engines were usually subject to two or more static test firings before

4875-418: The solid propellant. This produced hot gas which was allowed to build up until reaching a pressure of 600–700 psi , after which a bursting diaphragm released it into the turbine which drove the fuel turbopumps. This began the process of pumping fuel and oxidizer into the gas generator and the engine, and the hot gases from the SPGG provided the initial energy required to ignite the fuel/oxidizer mix. This started

4950-679: The sum of their individual components at the given fractions. Mixing equal volumes of ethanol and water results in only 1.92 volumes of mixture. Mixing ethanol and water is exothermic , with up to 777 J/mol being released at 298 K. Hydrogen bonding causes pure ethanol to be hygroscopic to the extent that it readily absorbs water from the air. The polar nature of the hydroxyl group causes ethanol to dissolve many ionic compounds, notably sodium and potassium hydroxides , magnesium chloride , calcium chloride , ammonium chloride , ammonium bromide , and sodium bromide . Sodium and potassium chlorides are slightly soluble in ethanol. Because

5025-546: The symptoms typically associated with alcohol intoxication—as well as many of the health hazards typically associated with the long-term consumption of ethanol—can be attributed to acetaldehyde toxicity in humans. The subsequent oxidation of acetaldehyde into acetate is performed by aldehyde dehydrogenase (ALDH) enzymes. A mutation in the ALDH2 gene that encodes for an inactive or dysfunctional form of this enzyme affects roughly 50 % of east Asian populations, contributing to

5100-449: The thin film of wine on the wall of the glass. As the wine's ethanol content decreases, its surface tension increases and the thin film "beads up" and runs down the glass in channels rather than as a smooth sheet. At atmospheric pressure, mixtures of ethanol and water form an azeotrope at about 89.4  mol% ethanol (95.6% ethanol by mass, 97% alcohol by volume ), with a boiling point of 351.3 K (78.1 °C). At lower pressure,

5175-487: The turbopumps spinning. Once RP-1 and LOX started burning in the gas generator, the exhaust powered the turbopumps until engine shutdown. [REDACTED]  This article incorporates public domain material from websites or documents of the National Aeronautics and Space Administration . Ethanol Ethanol (also called ethyl alcohol , grain alcohol , drinking alcohol , or simply alcohol )

5250-423: The wartime V-2 ballistic missile . During the war, North American Aviation (NAA) was given several 59,600 lbf (264.9 kN) V-2 engines to examine and convert from metric to SAE measurements. They formed their "Propulsion Division" to handle this work, later becoming Rocketdyne. NAA had also been given a wealth of technical documentation on the engine. Engineers studying them came across plans to improve

5325-717: The word from the German name Aether of the compound C 2 H 5 −O− C 2 H 5 (commonly called "ether" in English , more specifically called " diethyl ether "). According to the Oxford English Dictionary , Ethyl is a contraction of the Ancient Greek αἰθήρ ( aithḗr , "upper air") and the Greek word ὕλη ( hýlē , "wood, raw material", hence "matter, substance"). Ethanol

5400-578: Was coined as a result of a resolution on naming alcohols and phenols that was adopted at the International Conference on Chemical Nomenclature that was held in April 1892 in Geneva , Switzerland. The term alcohol now refers to a wider class of substances in chemistry nomenclature, but in common parlance it remains the name of ethanol. It is a medieval loan from Arabic al-kuḥl , a powdered ore of antimony used since antiquity as

5475-627: Was developing this 400,000 lbf (1,800 kN) engine for the Titan missile , and it was the largest engine nearing introduction within the time frame that ARPA gave Wernher von Braun to develop what was then known as the "Juno V". The E-1 had originally been developed as a backup engine for the Titan missile , designed specifically to be as simple to develop as possible, in case the Aerojet General LR-87 did not pan out. The launch of Sputnik that October led to rapid changes in

5550-469: Was first used for large-scale ethanol production by the Shell Oil Company in 1947. The reaction is carried out in the presence of high pressure steam at 300 °C (572 °F) where a 5:3 ethylene to steam ratio is maintained. This process was used on an industrial scale by Union Carbide Corporation and others. It is no longer practiced in the US as fermentation ethanol produced from corn

5625-646: Was later developed into the RS-27A and RS-56 . The RS-27A is a liquid-fuel rocket engine developed in 1980s by Rocketdyne for use on the first stage of the Delta II and Delta III launch vehicles. It provides 1.05 meganewtons (240,000 lbf) of thrust burning RP-1 and LOX in a gas-generator cycle . The engine is a modified version of its predecessor, the RS-27 ; its thrust nozzle has been extended to increase its area ratio from 8:1 to 12:1, which provides greater efficiency at altitude. The RS-27A main engine

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