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99-466: The dial allows for the quick and simple adjustment of the electronics governing car suspension settings, traction control , electronic differential , and change speed of electronic gearbox . A similar control system was employed on the Ferrari Enzo , but used individual buttons for different settings rather than a single rotary switch. This article about an automotive part or component

198-525: A boundary dispute with the neighboring town of Bow ; the name was meant to signify the new harmony between the two towns. In 1808, Concord was named the official seat of state government, and the State House was completed in 1819; it remains the oldest U.S. state capitol wherein the legislature meets in its original chambers. Concord is entirely within the Merrimack River watershed and

297-448: A bow. Horse-drawn carriages and Ford Model T used this system, and it is still used today in larger vehicles, mainly mounted in the rear suspension. Leaf springs were the first modern suspension system, and, along with advances in the construction of roads , heralded the single greatest improvement in road transport until the advent of the automobile . The British steel springs were not well-suited for use on America 's rough roads of

396-515: A center for politics, law, healthcare, and insurance companies . Concord is located in south-central New Hampshire at 43°12′24″N 71°32′17″W  /  43.20667°N 71.53806°W  / 43.20667; -71.53806 (43.2070, −71.5371). It is 38 miles (61 km) north of the Massachusetts border, 40 miles (64 km) west of the Maine border, 54 miles (87 km) east of

495-402: A day between Boston and Concord. Since then, there has not been any passenger rail service to Concord. In 2021, Amtrak announced their plan to implement new service between Boston and Concord by 2035. Local bus service is provided by Concord Area Transit (CAT), with three routes through the city. Regional bus service provided by Concord Coach Lines and Greyhound Lines is available from

594-463: A high-speed off-road vehicle encounters. Damping is the control of motion or oscillation, as seen with the use of hydraulic gates and valves in a vehicle's shock absorber. This may also vary, intentionally or unintentionally. Like spring rate, the optimal damping for comfort may be less, than for control. Damping controls the travel speed and resistance of the vehicle's suspension. An undamped car will oscillate up and down. With proper damping levels,

693-462: A low terrace to the west of the river, with residential neighborhoods climbing hills to the west and extending southwards towards the town of Bow. To the east of the Merrimack, atop a 100-foot (30 m) bluff, is a flat, sandy plain known as Concord Heights, which has seen most of the city's commercial development since 1960. The eastern boundary of Concord (with the town of Pembroke ) is formed by

792-710: A popular building material for many monumental halls in the early United States, and Concord granite was used in the construction of both the New Hampshire State House and the Library of Congress in Washington, D.C. In 1828, Lewis Downing joined J. Stephens Abbot to form Abbot and Downing . Their most famous product was their Concord coach , widely used in the development of the American West , and their enterprise largely boosted and changed

891-498: A spring rate close to the upper limit for that vehicle's weight. This allows the vehicle to perform properly under a heavy load, when control is limited by the inertia of the load. Riding in an empty truck meant for carrying loads can be uncomfortable for passengers, because of its high spring rate relative to the weight of the vehicle. A race car could also be described as having heavy springs, and would also be uncomfortably bumpy. However, even though we say they both have heavy springs,

990-400: A suspension system. In 1922, independent front suspension was pioneered on Lancia Lambda , and became more common in mass market cars from 1932. Today, most cars have independent suspension on all four wheels. The part on which pre-1950 springs were supported is called a dumb iron . In 2002, a new passive suspension component, the inerter , was invented by Malcolm C. Smith . This has

1089-547: A vehicle with zero sprung weight. They are then put through the same dynamic loads. The weight transfer for cornering in the front would be equal to the total unsprung front weight times the G-force times the front unsprung center of gravity height divided by the front track width. The same is true for the rear. Sprung weight transfer is the weight transferred by only the weight of the vehicle resting on its springs, and not by total vehicle weight. Calculating this requires knowing

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1188-416: A vehicle's sprung mass to roll. It is expressed as torque per degree of roll of the vehicle sprung mass. It is influenced by factors including but not limited to vehicle sprung mass, track width, CG height, spring and damper rates, roll centre heights of front and rear, anti-roll bar stiffness and tire pressure/construction. The roll rate of a vehicle can, and usually, does differ front-to-rear, which allows for

1287-537: A wheel are less severe, if the wheel lifts when the spring reaches its unloaded shape than they are, if travel is limited by contact of suspension members (See Triumph TR3B .) Many off-road vehicles , such as desert racers, use straps called "limiting straps" to limit the suspensions' downward travel to a point within safe limits for the linkages and shock absorbers. This is necessary, since these trucks are intended to travel over very rough terrain at high speeds, and even become airborne at times. Without something to limit

1386-553: Is Manchester–Boston Regional Airport , 23 miles (37 km) to the south. Concord's downtown underwent a significant renovation between 2015 and 2016, during the city's "Complete Streets Improvement Project". At a proposed cost of $ 12 million, the project promised to deliver on categories of maintenance to aging infrastructure , improved accessibility , increased sustainability , a safer experience for walkers, bikers and motorists alike, and to stimulate economic growth in an increasingly idle downtown. The main infrastructural change

1485-423: Is a stub . You can help Misplaced Pages by expanding it . Car suspension Suspension is the system of tires , tire air, springs , shock absorbers and linkages that connects a vehicle to its wheels and allows relative motion between the two. Suspension systems must support both road holding/ handling and ride quality , which are at odds with each other. The tuning of suspensions involves finding

1584-422: Is a component in setting the vehicle's ride height or its location in the suspension stroke. When a spring is compressed or stretched, the force it exerts, is proportional to its change in length. The spring rate or spring constant of a spring is the change in the force it exerts, divided by the change in deflection of the spring. Vehicles that carry heavy loads, will often have heavier springs to compensate for

1683-419: Is a simplified method of describing lateral load transfer distribution front to rear, and subsequently handling balance. It is the effective wheel rate, in roll, of each axle of the vehicle as a ratio of the vehicle's total roll rate. It is commonly adjusted through the use of anti-roll bars , but can also be changed through the use of different springs. Weight transfer during cornering, acceleration, or braking

1782-650: Is an average of 12 days of 90 °F (32 °C)+ highs annually. The window for freezing temperatures on average begins on September 27 and expires on May 14. The monthly daily average temperature range from 20.6 °F (−6.3 °C) in January to 70.0 °F (21.1 °C) in July. Temperature extremes have ranged from −37 °F (−38 °C) in February 1943 to 102 °F (39 °C) in July 1966. See or edit raw graph data . U.S. Decennial Census As of

1881-413: Is complex, and is determined by many factors; including, but not limited to: roll center height, spring and damper rates, anti-roll bar stiffness, and the kinematic design of suspension links. In most conventional applications, when weight is transferred through intentionally compliant elements, such as springs, dampers, and anti-roll bars, the weight transfer is said to be "elastic", while the weight which

1980-412: Is determined by the instantaneous front view swing arm (FVSA) length of suspension geometry, or in other words, the tendency of the tire to camber inward when compressed in bump. Roll center height is a product of suspension instant center heights and is a useful metric in analyzing weight transfer effects, body roll and front to rear roll stiffness distribution. Conventionally, roll stiffness distribution

2079-441: Is key information used in finding the force-based roll center as well. In this respect, the instant centers are more important to the handling of the vehicle, than the kinematic roll center alone, in that the ratio of geometric-to-elastic weight transfer is determined by the forces at the tires and their directions in relation to the position of their respective instant centers. Anti-dive and anti-squat are percentages that indicate

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2178-489: Is made up of its downtown, including its North End and South End neighborhoods, plus the four distinct villages of Penacook , Concord Heights, East Concord, and West Concord. Concord, as with much of New England, is within the humid continental climate zone ( Köppen Dfb ), with long, cold, snowy winters, warm (and at times humid) summers, and relatively brief autumns and springs. In winter, successive storms deliver moderate to at times heavy snowfall amounts, contributing to

2277-405: Is squared because it has two effects on the wheel rate: it applies to both the force and the distance traveled. Wheel rate on independent suspension is fairly straightforward. However, special consideration must be taken with some non-independent suspension designs. Take the case of the straight axle. When viewed from the front or rear, the wheel rate can be measured by the means above. Yet, because

2376-410: Is the "bump-stop", which protects the suspension and the vehicle (as well as the occupants) from the violent "bottoming" of the suspension, caused when an obstruction (or a hard landing) causes suspension to run out of upward travel without fully absorbing the energy of the stroke. Without bump-stops, a vehicle that "bottoms out", will experience a very hard shock when the suspension contacts the bottom of

2475-710: Is the oldest state house in which the legislature meets in its original chambers. The building was remodeled in 1866, and the third story and west wing were added in 1910. Across from the State House is the Eagle Hotel on Main Street, which has been a downtown landmark since its opening in 1827. U.S. Presidents Ulysses S. Grant , Rutherford Hayes , and Benjamin Harrison all dined there, and Franklin Pierce spent

2574-412: Is transferred through more rigid suspension links, such as A-arms and toe links, is said to be "geometric". Unsprung weight transfer is calculated based on weight of the vehicle's components that are not supported by the springs. This includes tires, wheels, brakes, spindles, half the control arm's weight, and other components. These components are then (for calculation purposes) assumed to be connected to

2673-660: Is tuned adjusting antiroll bars rather than roll center height (as both tend to have a similar effect on the sprung mass), but the height of the roll center is significant when considering the amount of jacking forces experienced. Due to the fact that the wheel and tire's motion is constrained by the vehicle's suspension links, the motion of the wheel package in the front view will scribe an imaginary arc in space with an "instantaneous center" of rotation at any given point along its path. The instant center for any wheel package can be found by following imaginary lines drawn through suspension links to their intersection point. A component of

2772-486: Is usually calculated per individual wheel, and compared with the static weights for the same wheels. The total amount of weight transfer is only affected by four factors: the distance between wheel centers (wheelbase in the case of braking, or track width in the case of cornering), the height of the center of gravity, the mass of the vehicle, and the amount of acceleration experienced. The speed at which weight transfer occurs, as well as through which components it transfers,

2871-545: The Amoskeag Falls downriver, connecting Concord with Boston by way of the Middlesex Canal . In 1808, Concord was named the official seat of state government, and in 1816 architect Stuart Park was commissioned to design a new capitol building for the state legislature on land sold to the state by local Quakers . Construction on the State House was completed in 1819, and it remains the oldest capitol in

2970-598: The Boston and Maine Railroad . The former Concord Station was located at what is now a Burlington department store on Storrs Street. The station itself was built in 1860, but the fourth and most famous iteration of the station was built in 1885, which had a brick head house designed by Bradford L. Gilbert . The head house was demolished in 1959 and replaced by a smaller "McGinnis Era" station. By 1967, all passenger rail services to Concord had been discontinued. For 13 months in 1980 and 1981, MBTA Commuter Rail ran two round trips

3069-690: The Contoocook River , just before it flows into the Merrimack. As of 2020, the top employer in the city was the State of New Hampshire, and the largest private employer was Concord Hospital . Concord is home to the University of New Hampshire School of Law , New Hampshire's only law school ; St. Paul's School , a private preparatory school ; NHTI , a two-year community college ; the New Hampshire Police Academy; and

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3168-454: The De Dion tube , which is sometimes called "semi-independent". Like true independent rear suspension, this employs two universal joints , or their equivalent from the centre of the differential to each wheel. But the wheels cannot entirely rise and fall independently of each other; they are tied by a yoke that goes around the differential, below and behind it. This method has had little use in

3267-568: The Landau . By the middle of the 19th century, elliptical springs might additionally start to be used on carriages. Automobiles were initially developed as self-propelled versions of horse-drawn vehicles. However, horse-drawn vehicles had been designed for relatively slow speeds, and their suspension was not well suited to the higher speeds permitted by the internal combustion engine. The first workable spring-suspension required advanced metallurgical knowledge and skill, and only became possible with

3366-858: The New Hampshire Executive Council , Concord is in the 2nd District, represented by Cinde Warmington, the sole Democrat on the council. In the United States House of Representatives , Concord is in New Hampshire's 2nd congressional district , represented by Democrat Ann McLane Kuster . New Hampshire Department of Corrections operates the New Hampshire State Prison for Men and New Hampshire State Prison for Women in Concord. Concord leans strongly Democratic in presidential elections;

3465-651: The Soucook River , a tributary of the Merrimack. The Turkey River winds through the southwestern quarter of the city, passing through the campus of St. Paul's School before entering the Merrimack River in Bow. In the northern part of the city, the Contoocook River enters the Merrimack at the village of Penacook. Concord is 16 miles (26 km) north of Manchester , New Hampshire's largest city, and 66 miles (106 km) north of Boston . The city of Concord

3564-506: The United States . Its use around 1900 was probably due to the poor quality of tires, which wore out quickly. By removing a good deal of unsprung weight , as independent rear suspensions do, it made them last longer. Rear-wheel drive vehicles today frequently use a fairly complex fully-independent, multi-link suspension to locate the rear wheels securely, while providing decent ride quality . The spring rate (or suspension rate)

3663-596: The Vermont border, and 170 miles (270 km) south of the Canadian border at Pittsburg . According to the United States Census Bureau , the city has a total area of 67.2 square miles (174.0 km ). 64.0 square miles (165.7 km ) of it are land and 3.2 square miles (8.4 km ) of it are water, comprising 4.81% of the city. Concord is drained by the Merrimack River . Penacook Lake ,

3762-549: The census of 2020, there were 43,976 people residing in the city. The population density was 687.7 people per square mile (265.5 people/km ). At the 2010 Census there were 42,695 residents and 10,052 families in the city, as well as 18,852 housing units at an average density of 293.2 per square mile (113.2/km ). The racial makeup of the city in 2020 was 84.5% White , 4.9% Black or African American , 1.0% Native American , 4.9% Asian , 0.1% Pacific Islander , 0.4% from some other race , and 1.8% from two or more races. 4.9% of

3861-490: The Concord city charter , the mayor chairs the council, however has very few formal powers over the day-to-day management of the city. The actual operations of the city are overseen by the city manager , currently Thomas J. Aspell Jr. The current police chief is Bradley S. Osgood. In the New Hampshire Senate , Concord is in the 15th District, represented by Democrat Becky Whitley since December 2020. On

3960-493: The Concord Transportation Center at 30 Stickney Avenue next to Exit 14 on Interstate 93, with service south to Boston and points in between, as well as north to Littleton and northeast to Berlin . General aviation services are available through Concord Municipal Airport , located 2 miles (3 km) east of downtown. There is no commercial air service within the city limits; the nearest such airport

4059-490: The Concord area during campaign season. The city also developed an identity within the emerging space industry , with the McAuliffe-Shepard Discovery Center opening in 1990 to commemorate Alan Shepard , the first American in space from nearby Derry , and Christa McAuliffe , a teacher at Concord High School who died in the 1986 Space Shuttle Challenger disaster . Today, Concord remains

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4158-565: The New Hampshire Fire Academy. Concord's Old North Cemetery is the final resting place of Franklin Pierce , 14th President of the United States . Interstate 89 and Interstate 93 are the two main interstate highways serving the city, and general aviation access is via Concord Municipal Airport . The nearest airport with commercial air service is Manchester–Boston Regional Airport , 23 miles (37 km) to

4257-500: The United States. The State Hospital continued to expand throughout the following decades, and in 1891 Concord Hospital opened its doors as Margaret Pillsbury General Hospital, the first general hospital in the state of New Hampshire. Concord's economy changed once again in the 20th century with the declining railroad and textile industry. The city developed into a center for national politics due to New Hampshire's first-in-the-nation primary, and many presidential candidates still visit

4356-502: The ability to increase the effective inertia of wheel suspension using a geared flywheel, but without adding significant mass. It was initially employed in Formula One in secrecy, but has since spread to wider motorsport. For front-wheel drive cars , rear suspension has few constraints, and a variety of beam axles and independent suspensions are used. For rear-wheel drive cars , rear suspension has many constraints, and

4455-414: The actual spring rates for a 2,000 lb (910 kg) racecar and a 10,000 lb (4,500 kg) truck are very different. A luxury car, taxi, or passenger bus would be described as having soft springs, for the comfort of their passengers or driver. Vehicles with worn-out or damaged springs ride lower to the ground, which reduces the overall amount of compression available to the suspension, and increases

4554-483: The additional weight that would otherwise collapse a vehicle to the bottom of its travel (stroke). Heavier springs are also used in performance applications, where the loading conditions experienced are more significant. Springs that are too hard or too soft cause the suspension to become ineffective – mostly because they fail to properly isolate the vehicle from the road. Vehicles that commonly experience suspension loads heavier than normal, have heavy or hard springs, with

4653-522: The advent of industrialisation . Obadiah Elliott registered the first patent for a spring-suspension vehicle; each wheel had two durable steel leaf springs on each side and the body of the carriage was fixed directly to the springs which were attached to the axles . Within a decade, most British horse carriages were equipped with springs; wooden springs in the case of light one-horse vehicles to avoid taxation , and steel springs in larger vehicles. These were often made of low-carbon steel and usually took

4752-436: The amount of body lean. Performance vehicles can sometimes have spring rate requirements other than vehicle weight and load. Wheel rate is the effective spring rate when measured at the wheel, as opposed to simply measuring the spring rate alone. Wheel rate is usually equal to or considerably less than the spring rate. Commonly, springs are mounted on control arms, swing arms or some other pivoting suspension member. Consider

4851-428: The car will settle back to a normal state in a minimal amount of time. Most damping in modern vehicles can be controlled by increasing or decreasing the resistance to fluid flow in the shock absorber. See dependent and independent below. Camber changes due to wheel travel, body roll and suspension system deflection or compliance. In general, a tire wears and brakes best at -1 to -2° of camber from vertical. Depending on

4950-414: The city economy in the mid-19th century. In subsequent years, Concord would also become a hub for the railroad industry, with Penacook a textile manufacturing center using water power from the Contoocook River . The city also around this time started to become a center for the emerging healthcare industry, with New Hampshire State Hospital opening in 1842 as one of the first psychiatric hospitals in

5049-523: The city from east to west. State routes 13 and 132 also serve the city: Route 13 leads southwest out of Concord towards Goffstown and Milford , while Route 132 travels north parallel to Interstate 93. New Hampshire Route 106 passes through the easternmost part of Concord, crossing I-393 and NH 9 before crossing the Soucook River south into the town of Pembroke . To the north, NH 106 leads to Loudon , Belmont and Laconia . Historically, Concord served as an important railroad terminal and station for

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5148-547: The city is centered on the river. The Merrimack runs from northwest to southeast through the city. The city's eastern boundary is formed by the Soucook River , which separates Concord from the town of Pembroke . The Turkey River passes through the southwestern quarter of the city. The city consists of its downtown , including the North End and South End neighborhoods, along with the four villages of Penacook , Concord Heights, East Concord, and West Concord. Penacook sits along

5247-583: The city limits. Interstate 89 links Concord with Lebanon and the state of Vermont to the northwest, while Interstate 93 connects the city to Plymouth , Littleton , and the White Mountains to the north and Manchester and Boston to the south. Interstate 393 is a spur highway leading east from Concord and merging with U.S. Route 4 as a direct route to New Hampshire's Seacoast region . North-south U.S. Route 3 serves as Concord's Main Street, while U.S. Route 202 and New Hampshire Route 9 cross

5346-405: The council-manager system. The city council consists of a mayor and 14 councilors, ten of which are elected to two-year terms representing each of the city wards, while the other four are elected at-large to four-year terms. The mayor is elected directly every two years. The current mayor as of 2024 is Byron Champlin, who was elected on November 7, 2023, with more than 75% of the vote. According to

5445-495: The degree to which the front dives under braking, and the rear squats under acceleration. They can be thought of as the counterparts for braking and acceleration, as jacking forces are to cornering. The main reason for the difference is due to the different design goals between front and rear suspension, whereas suspension is usually symmetrical between the left and the right of the vehicle. The method of determining anti-dive or anti-squat depends on whether suspension linkages react to

5544-415: The development of the superior, but more expensive independent suspension layout has been difficult. Henry Ford 's Model T used a torque tube to restrain this force, for his differential was attached to the chassis by a lateral leaf spring and two narrow rods. The torque tube surrounded the true driveshaft and exerted the force to its ball joint at the extreme rear of the transmission, which

5643-528: The differential of the live axle . These springs transmit torque to the frame. Although scorned by many European car makers of the time, it was accepted by American car makers, because it was inexpensive to manufacture. Also, the dynamic defects of this design were suppressed by the enormous weight of U.S. passenger vehicles before the implementation of the Corporate Average Fuel Economy (CAFE) standard. Another Frenchman invented

5742-432: The downtown. Many power lines were buried, and street trees , colorful benches, art installations, and other green spaces were added, all allowing people to reclaim a space long dominated by cars. Main Street underwent serious traffic calming , including a road diet , increased diagonal parking, widening sidewalks, adding shared lane markings, adding trees, texturing medians and coloring crosswalks red. Another aspect of

5841-420: The estimated median annual income for a household in the city was $ 52,695, and the median income for a family was $ 73,457. Male full-time workers had a median income of $ 49,228 versus $ 38,782 for females. The per capita income for the city was $ 29,296. About 5.5% of families and 10.1% of the population were below the poverty line , including 8.4% of those under age 18 and 5.5% of those age 65 or over. In 2020,

5940-468: The example above, where the spring rate was calculated to be 500 lbs/inch (87.5 N/mm), if one were to move the wheel 1 in (2.5 cm) (without moving the car), the spring more than likely compresses a smaller amount. If the spring moved 0.75 in (19 mm), the lever arm ratio would be 0.75:1. The wheel rate is calculated by taking the square of the ratio (0.5625) times the spring rate, thus obtaining 281.25 lbs/inch (49.25 N/mm). The ratio

6039-671: The fall of 2002, brings independent films and filmmakers to Concord and has provided an outlet for local filmmakers to display their films. SNOB Film Festival was a catalyst for the building in 2007 of Red River Theatres, a locally owned, nonprofit, independent cinema named after the 1948 film featuring John Wayne. Other sites of interest include the Capitol Center for the Arts , the New Hampshire Historical Society , which has two facilities in Concord, and

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6138-414: The form of multiple layer leaf springs. Leaf springs have been around since the early Egyptians . Ancient military engineers used leaf springs in the form of bows to power their siege engines , with little success at first. The use of leaf springs in catapults was later refined and made to work years later. Springs were not only made of metal; a sturdy tree branch could be used as a spring, such as with

6237-430: The frame or body, which is transferred to the occupants and every connector and weld on the vehicle. Factory vehicles often come with plain rubber "nubs" to absorb the worst of the forces, and insulate the shock. A desert race vehicle, which must routinely absorb far higher impact forces, might be provided with pneumatic or hydro-pneumatic bump-stops. These are essentially miniature shock absorbers (dampers) that are fixed to

6336-406: The largest lake in the city and its main source of water, is in the west. The highest point in Concord is 860 feet (260 m) above sea level on Oak Hill, just west of the hill's 970-foot (300 m) summit in neighboring Loudon . Concord lies fully within the Merrimack River watershed and is centered on the river, which runs from northwest to southeast through the city. Downtown is located on

6435-513: The last Republican nominee to carry the city was then Vice President George H. W. Bush in 1988. Voter turnout was 72.7% in the 2020 general election, down from 76.2% in 2016, but still above the 2020 national turnout of 66.7%. Newspapers and journals Radio The city is otherwise served by Manchester area stations . New Hampshire Public Radio is headquartered in Concord. Television The New Hampshire State House , designed by architect Stuart Park and constructed between 1815 and 1818,

6534-409: The most expensive offenders, the budget ended up at $ 14.2 million, with the project actually coming in $ 1.1 million below that. Although adding final aesthetic touches with the extra money were debated, the city council ended up deciding to save for financially straining years ahead. The design was carried out by McFarland Johnson, IBI Group, and City of Concord Engineering. Concord is governed via

6633-556: The nation in which the state's legislative branches meet in their original chambers. Concord was also named the seat of Merrimack County in 1823, and the Merrimack County Courthouse was constructed in 1857 in the North End at the site of the Old Town House. In the early 19th century, much of the city's economy was dominated by furniture -making, printing, and granite quarrying ; granite had become

6732-509: The new construction was adding heated sidewalk capabilities, utilizing excess steam from the local Concord Steam plant, and minimizing sand and snow blowing needed during the winter months. Funding for Complete Streets came from a combination of $ 4,710,000 from a USDOT TIGER grant and the rest from the City of Concord. The project was initially proposed as costing $ 7,850,000, but ran over budget due to overambitious ideas. After scrapping some of

6831-459: The night before departing for his inauguration. Other well-known guests included Jefferson Davis , Charles Lindbergh , Eleanor Roosevelt , Richard M. Nixon (who carried New Hampshire in all three of his presidential bids), and Thomas E. Dewey . The hotel closed in 1961. South from the Eagle Hotel on Main Street is Phenix Hall, which replaced "Old" Phenix Hall, which burned in 1893. Both

6930-686: The north end of Main Street is the Pierce Manse , in which President Franklin Pierce lived in Concord before and following his presidency. The mid-1830s Greek Revival house was moved from Montgomery Street to North Main Street in 1971 to prevent its demolition. Beaver Meadow Golf Course, located in the northern part of Concord, is one of the oldest golf courses in New England. Besides this golf course, other important sporting venues in Concord include Everett Arena and Memorial Field. The SNOB (Somewhat North Of Boston) Film Festival, started in

7029-673: The old and new buildings featured multi-purpose auditoriums used for political speeches, theater productions, and fairs. Abraham Lincoln spoke at the old hall in 1860; Theodore Roosevelt , at the new hall in 1912. North on Main Street is the Walker-Woodman House, also known as the Reverend Timothy Walker House, the oldest standing two-story house in Concord. It was built for the Reverend Timothy Walker between 1733 and 1735. On

7128-449: The platform swing on iron chains attached to the wheeled frame of the carriage. This system remained the basis for most suspension systems until the turn of the 19th century, although the iron chains were replaced with the use of leather straps called thoroughbraces by the 17th century. No modern automobiles have used the thoroughbrace suspension system. By approximately 1750, leaf springs began appearing on certain types of carriage, such as

7227-659: The population was 43,976, making it the 3rd most populous city in New Hampshire after Manchester and Nashua . The area was first settled by Europeans in 1659. On January 17, 1725, the Province of Massachusetts Bay granted the Concord area as the Plantation of Penacook, and it was incorporated on February 9, 1734, as the Town of Rumford. Governor Benning Wentworth gave the city its current name in 1765 following

7326-460: The population were Hispanic or Latino of any race. In 2010 there were 17,592 households, out of which 28.7% had children under the age of 18 living with them, 41.3% were headed by married couples living together, 11.6% had a female householder with no husband present, and 42.9% were non-families. 33.6% of all households were made up of individuals, and 12.0% were someone living alone who was 65 years of age or older. The average household size

7425-407: The relatively reliable snow cover. In addition, lows reach below 0 °F (−18 °C) on an average 15 nights per year, and the city straddles the border between USDA Hardiness Zone 5b and 6a. However, thaws are frequent, with one to three days per month with 50 °F (10 °C)+ highs from December to February. Summer can bring stretches of humid conditions as well as thunderstorms, and there

7524-461: The right compromise. It is important for the suspension to keep the road wheel in contact with the road surface as much as possible, because all the road or ground forces acting on the vehicle do so through the contact patches of the tires . The suspension also protects the vehicle itself and any cargo or luggage from damage and wear. The design of front and rear suspension of a car may be different. An early form of suspension on ox -drawn carts had

7623-478: The site of Pennacook Falls. Concord grew in prominence throughout the 18th century, and some of the earliest houses from this period survive at the northern end of Main Street . In the years following the Revolution , Concord's central geographical location made it a logical choice for the state capital, particularly after Samuel Blodget in 1807 opened a canal and lock system to allow vessels passage around

7722-475: The south. There has been no passenger rail service to Concord since 1981. Historically, the Boston and Maine Railroad served the city. The area that would become Concord was originally settled thousands of years ago by Abenaki Native Americans called the Pennacook . The tribe fished for migrating salmon , sturgeon , and alewives with nets strung across the rapids of the Merrimack River . The stream

7821-457: The spring as close to the wheel as possible. Wheel rates are usually summed and compared with the sprung mass of a vehicle to create a "ride rate" and the corresponding suspension natural frequency in ride (also referred to as "heave"). This can be useful in creating a metric for suspension stiffness and travel requirements for a vehicle. Roll rate is analogous to a vehicle's ride rate, but for actions that include lateral accelerations, causing

7920-472: The sprung center of gravity height is the roll moment arm length. The total sprung weight transfer is equal to the G-force times the sprung weight times the roll moment arm length divided by the effective track width. The front sprung weight transfer is calculated by multiplying the roll couple percentage times the total sprung weight transfer. The rear is the total minus the front transfer. Jacking forces are

8019-601: The steep bends of the Merrimack River through the area. On January 17, 1725, the Province of Massachusetts Bay , which then claimed territories west of the Merrimack, granted the Concord area as the Plantation of Penacook. It was settled between 1725 and 1727 by Captain Ebenezer Eastman and others from Haverhill, Massachusetts . On February 9, 1734, the town was incorporated as "Rumford", from which Sir Benjamin Thompson, Count Rumford , would take his title. It

8118-419: The sum of the vertical force components experienced by suspension links. The resultant force acts to lift the sprung mass, if the roll center is above ground, or compress it, if underground. Generally, the higher the roll center , the more jacking force is experienced. Travel is the measure of distance from the bottom of the suspension stroke (such as when the vehicle is on a jack, and the wheel hangs freely) to

8217-516: The time, so the Abbot-Downing Company of Concord, New Hampshire re-introduced leather strap suspension, which gave a swinging motion instead of the jolting up-and-down of spring suspension. In 1901, Mors of Paris first fitted an automobile with shock absorbers . With the advantage of a damped suspension system on his 'Mors Machine', Henri Fournier won the prestigious Paris-to-Berlin race on 20 June 1901. Fournier's superior time

8316-476: The tire and the road surface, it may hold the road best at a slightly different angle. Small changes in camber, front and rear, can be used to tune handling. Some racecars are tuned with -2 to -7° camber, depending on the type of handling desired, and tire construction. Often, too much camber will result in the decrease of braking performance due to a reduced contact patch size through excessive camber variation in suspension geometry. The amount of camber change in bump

8415-435: The tire's force vector points from the contact patch of the tire through instant center. The larger this component is, the less suspension motion will occur. Theoretically, if the resultant of the vertical load on the tire and the lateral force generated by it points directly into the instant center, the suspension links will not move. In this case, all weight transfer at that end of the vehicle will be geometric in nature. This

8514-504: The top employer in the city remained the State of New Hampshire, with over 6,000 employed workers, while the largest private employer was Concord Hospital, with just under 3,000 employees. According to the City of Concord's Comprehensive Annual Financial Report, the top 10 employers in the city for the Fiscal Year 2020 were: Interstate 89 and Interstate 93 are the two main interstate highways serving Concord, and join just south of

8613-414: The top of the suspension stroke (such as when the vehicle's wheel can no longer travel in an upward direction toward the vehicle). Bottoming or lifting a wheel can cause serious control problems, or directly cause damage. "Bottoming" can be caused by the suspension, tires, fenders, etc. running out of space to move, or the body or other components of the car hitting the road. Control problems caused by lifting

8712-410: The torque of braking and accelerating. For example, with inboard brakes and half-shaft-driven rear wheels, the suspension linkages do not react, but with outboard brakes and a swing-axle driveline, they do. Concord, New Hampshire Concord ( / ˈ k ɒ ŋ k ər d / ) is the capital city of the U.S. state of New Hampshire and the seat of Merrimack County . As of the 2020 census

8811-413: The travel, the suspension bushings would take all the force, when suspension reaches "full droop", and it can even cause the coil springs to come out of their "buckets", if they are held in by compression forces only. A limiting strap is a simple strap, often from nylon of a predetermined length, that stops downward movement at a pre-set point before theoretical maximum travel is reached. The opposite of this

8910-579: The tuning ability of a vehicle for transient and steady-state handling. The roll rate of a vehicle does not change the total amount of weight transfer on the vehicle, but shifts the speed and percentage of weight transferred on a particular axle to another axle through the vehicle chassis. Generally, the higher the roll rate on an axle of a vehicle, the faster and higher percentage the weight transfer on that axle . By 2021, some vehicles were offering dynamic roll control with ride-height adjustable air suspension and adaptive dampers. Roll couple percentage

9009-429: The vehicle in a location, such, that the suspension will contact the end of the piston when it nears the upward travel limit. These absorb the impact far more effectively than a solid rubber bump-stop will, essential, because a rubber bump-stop is considered a "last-ditch" emergency insulator for the occasional accidental bottoming of the suspension; it is entirely insufficient to absorb repeated and heavy bottoming, such as

9108-453: The vehicle's sprung weight (total weight less the unsprung weight), the front and rear roll center heights, and the sprung center of gravity height (used to calculate the roll moment arm length). Calculating the front and rear sprung weight transfer will also require knowing the roll couple percentage. The roll axis is the line through the front and rear roll centers that the vehicle rolls around during cornering. The distance from this axis to

9207-402: The wheels are not independent, when viewed from the side under acceleration or braking, the pivot point is at infinity (because both wheels have moved) and the spring is directly inline with the wheel contact patch. The result is often, that the effective wheel rate under cornering is different from what it is under acceleration and braking. This variation in wheel rate may be minimised by locating

9306-533: Was 11 hours 46 minutes and 10 seconds, while the best competitor was Léonce Girardot in a Panhard with a time of 12 hours, 15 minutes, and 40 seconds. Coil springs first appeared on a production vehicle in 1906 in the Brush Runabout made by the Brush Motor Company. Today, coil springs are used in most cars. In 1920, Leyland Motors used torsion bars in

9405-411: Was 2.26, and the average family size was 2.90. In the city, the population was spread out, with 20.7% under the age of 18, 9.3% from 18 to 24, 28.0% from 25 to 44, 28.2% from 45 to 64, and 13.8% who were 65 years of age or older. The median age was 39.4 years. For every 100 females, there were 98.5 males. For every 100 females age 18 and over, there were 96.9 males. For the period 2009–2011,

9504-532: Was also the transportation route for their birch bark canoes, which could travel from Lake Winnipesaukee to the Atlantic Ocean. The broad sweep of the Merrimack River valley floodplain provided good soil for farming beans , gourds , pumpkins , melons and maize . The area was first settled by Europeans in 1659 as Penacook, after the Abenaki word "pannukog" meaning "bend in the river," referencing

9603-482: Was attached to the engine. A similar method like this was used in the late 1930s by Buick and by Hudson 's bathtub car in 1948, which used helical springs that could not take fore-and-aft thrust. The Hotchkiss drive , invented by Albert Hotchkiss, was the most popular rear suspension system used in American cars from the 1930s to the 1970s. The system uses longitudinal leaf springs attached both forward and behind

9702-469: Was reducing the four-lane street (two in each direction) to two lanes plus a turning lane in the center. The freed-up space would contribute to extra width for bikes to ride in either direction, increased curb size and an added median where there is no need for a turning lane. Concord opted to add shared lane markings for bikes, rather than a dedicated protected bike lane . By adding curb space, this project created new opportunities for pedestrians to enjoy

9801-473: Was renamed "Concord" in 1765 by Governor Benning Wentworth following a bitter boundary dispute between Rumford and the town of Bow ; the city name was meant to reflect the new concord, or harmony, between the disputant towns. Citizens displaced by the resulting border adjustment were given land elsewhere as compensation. In 1779, New Pennacook Plantation was granted to Timothy Walker Jr. and his associates at what would be incorporated in 1800 as Rumford, Maine ,

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