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76-482: Sprint cars have very high power-to-weight ratios , with weights of approximately 1,400 pounds (640 kg) (including the driver) and power outputs of over 900 horsepower (670 kW), which give them a power-to-weight ratio besting that of contemporary F1 cars. Typically, they are powered by a naturally aspirated, methanol -injected overhead valve American V8 engine with a displacement of 410 cubic inches (6.7L) and capable of engine speeds of 9000 rpm. Depending on

152-690: A 10-time winner of the Australian Sprintcar Championship , was the winner. Wingless cars were televised first when USAC had an ESPN television contract. The first national live television deal with winged sprint cars came on The Nashville Network (TNN) in 1992–93 and again in 1993–94 with a winter-based series in Arizona, which featured Mike Joy calling the action. Live coverage of the Knoxville Nationals on The Nashville Network began in 1995. A year later,

228-485: A 360 cubic inch (5.9 L) engine which generates approximately 650 horsepower (480 kW). They race with alcohol fuel and use mechanical fuel injection (MFI) to deliver it into the combustion chamber. The American Sprint Car Series (ASCS) sanctions both winged and wingless sprint car racing within the United States. ASCS winged cars use a 360 cubic inch engine which lead to fans calling the cars "360s". The series

304-403: A continuous flow of electrolyte. Flow cells typically have the fuel dissolved in the electrolyte. Power-to-weight ratios for vehicles are usually calculated using curb weight (for cars) or wet weight (for motorcycles), that is, excluding weight of the driver and any cargo. This could be slightly misleading, especially with regard to motorcycles, where the driver might weigh 1/3 to 1/2 as much as

380-406: A cutoff voltage are typically specified for a battery by its manufacturer. The output voltage falls to the cutoff voltage when the battery becomes "discharged". The nominal output voltage is always less than the open-circuit voltage produced when the battery is "charged". The temperature of a battery can affect the power it can deliver, where lower temperatures reduce power. Total energy delivered from

456-504: A cyclist's power-to-weight output decreases with fatigue, it is normally discussed with relation to the length of time that he or she maintains that power. A professional cyclist can produce over 20 W/kg (0.012 hp/lb) as a five-second maximum. World of Outlaws World of Outlaws Sprint Car Series , originally known as the World of Outlaws (often abbreviated WoO ) is an American national touring dirt track racing series. It

532-467: A fluid, or storage in a pressure vessel . A variety of effects can be harnessed to produce thermoelectricity , thermionic emission , pyroelectricity and piezoelectricity . Electrical resistance and ferromagnetism of materials can be harnessed to generate thermoacoustic energy from an electric current. All electrochemical cell batteries deliver a changing voltage as their chemistry changes from "charged" to "discharged". A nominal output voltage and

608-429: A great amount of downforce to help the car turn and maximize grip, both in the corners and on the straightaways. The cars also have smaller wings on the nose to provide more downforce to the front wheels. Sprint cars use "quick change" rear ends. This allows the teams to quickly change the gear ratio for different size tracks. Most cars use a torsion bar suspension system. Different size bars either soften or stiffen

684-563: A higher discharge current – and therefore higher power-to-weight ratio – but only with a lower energy capacity. Power-to-weight ratio for batteries is therefore less meaningful without reference to corresponding energy-to-weight ratio and cell temperature. This relationship is known as Peukert's law . Capacitors store electric charge onto two electrodes separated by an electric field semi-insulating ( dielectric ) medium. Electrostatic capacitors feature planar electrodes onto which electric charge accumulates. Electrolytic capacitors use

760-406: A liquid electrolyte as one of the electrodes and the electric double layer effect upon the surface of the dielectric-electrolyte boundary to increase the amount of charge stored per unit volume. Electric double-layer capacitors extend both electrodes with a nanoporous material such as activated carbon to significantly increase the surface area upon which electric charge can accumulate, reducing

836-507: A mass of 380 kg (840 lb), giving it a power-to-weight ratio of 0.65 kW/kg (0.40 hp/lb). Examples of high power-to-weight ratios can often be found in turbines. This is because of their ability to operate at very high speeds. For example, the Space Shuttle 's main engines used turbopumps (machines consisting of a pump driven by a turbine engine) to feed the propellants (liquid oxygen and liquid hydrogen ) into

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912-500: A neck restraint that meets a given safety rating, and at any time the car and equipment may be subject to inspection. The various SFI and Snell ratings may differ between sanctioning bodies, and many rule books include additional safety recommendations to be used at team or driver discretion. As for those hosting an event the sanctioning body will often place mandatory safety requirements on the facility including guard rails, retaining walls, concrete walls, and electronic caution lights. It

988-587: A next-day tape deal with CBS for one race at Eldora Speedway aired while TNN coverage expanded. By 2000, CBS (which owned TNN at the time) announced TNN would air 15 live events, including the King's Royal at Eldora Speedway and the Knoxville Nationals. By the 2001 season, plans were to cover 18 live races, but midway through the season MTV Networks closed the CBS motorsports operations. This move relegated

1064-647: A period of time is equal to the difference in its total energy over that period of time, so the rate at which work is done is equal to the rate of change of the kinetic energy (in the absence of potential energy changes). The work done from time t to time t + Δ t along the path C is defined as the line integral ∫ C F ⋅ d x = ∫ t t + Δ t F ⋅ v ( t ) d t {\displaystyle \int _{C}\mathbf {F} \cdot d\mathbf {x} =\int _{t}^{t+\Delta t}\mathbf {F} \cdot \mathbf {v} (t)dt} , so

1140-457: A quad or truck. They also do not have flywheels, clutches or transmissions, but the direct drive systems can be engaged or disengaged from the cockpits. This is done both for weight reasons and tradition. Another tradition the WoO has pertaining their "A-main" (the last race of the event) is to have the cars line up four wide just before starting the race as a salute to fans in attendance, giving rise to

1216-914: A result, they do not have electric starters (or even electrical systems other than a ignition magneto ) and require a push to be started. The safety record of sprint car racing in recent years has been greatly improved by the use of roll cages, and especially on dirt tracks, wings, which increase surface traction, to protect the drivers. Many IndyCar Series and NASCAR drivers used sprint car racing as an intermediate stepping stone on their way to more high-profile divisions, including Indianapolis 500 winners A. J. Foyt , Mario Andretti , Johnny Rutherford , Parnelli Jones , Johnnie Parsons , Al Unser Sr ., and Al Unser Jr. , as well as NASCAR Cup Series champions Jeff Gordon , Tony Stewart and Kyle Larson . The National Sprint Car Hall of Fame & Museum , located in Knoxville, Iowa , features exhibits highlighting

1292-479: A set of rules and a points system to crown a champion of his series. In 2003, Johnson sold the series to Boundless Motor Sports Racing, later renamed Dirt Motorsports and currently World Racing Group (WRG). In 2004 WRG extended its subscription-based streaming service ( DIR TV ision ), to the Outlaw series. It originally offered radio broadcasts of all races, and added video streaming to select races, until reaching

1368-463: A single charge cycle is affected by both the battery temperature and the power it delivers. If the temperature lowers or the power demand increases, the total energy delivered at the point of "discharge" is also reduced. Battery discharge profiles are often described in terms of a factor of battery capacity . For example, a battery with a nominal capacity quoted in ampere-hours (Ah) at a C/10 rated discharge current (derived in amperes) may safely provide

1444-401: A speed | v ( t ) | {\displaystyle |\mathbf {v} (t)|\;} and angle ϕ {\displaystyle \phi \;} with respect to the centre and radial of a gravitational field by an onboard powerplant , then the associated kinetic energy is where: The work–energy principle states that the work done to the object over

1520-412: A sprint car is 105 inches in circumference. In contrast, the left rear tire is only between 90 and 98 inches in circumference, depending on the track size and conditions. The difference in the tire sizes is called stagger. The more stagger the car has, the sharper the car can turn, but at the expense of straight line speed. Sprint cars do not have starters, so push trucks are used to push the cars to start

1596-667: A train. As the coefficient of friction between steel wheels and rails seldom exceeds 0.25 in most cases, improving a locomotive's power-to-weight ratio is often counterproductive. However, the choice of power transmission system, such as variable-frequency drive versus direct-current drive , may support a higher power-to-weight ratio by better managing propulsion power. Most vehicles are designed to meet passenger comfort and cargo carrying requirements. Vehicle designs trade off power-to-weight ratio to increase comfort, cargo space, fuel economy , emissions control , energy security and endurance. Reduced drag and lower rolling resistance in

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1672-522: A vehicle design can facilitate increased cargo space without increase in the (zero cargo) power-to-weight ratio. This increases the role flexibility of the vehicle. Energy security considerations can trade off power (typically decreased) and weight (typically increased), and therefore power-to-weight ratio, for fuel flexibility or drive-train hybridisation . Some utility and practical vehicle variants such as hot hatches and sports-utility vehicles reconfigure power (typically increased) and weight to provide

1748-408: Is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. Power-to-weight ratio is a measurement of actual performance of any engine or power source. It is also used as a measurement of performance of a vehicle as a whole, with the engine's power output being divided by the weight (or mass ) of the vehicle, to give a metric that

1824-697: Is a division of wingless 410 cubic inch sprint cars that run throughout the United States on asphalt and dirt tracks. The USAC also sanctions regional 360ci wingless sprint car series: the USAC East Coast Sprint Cars, USAC Southwest Sprint Cars, and USAC West Coast Sprint Cars. The United Racing Company (URC) is a division for winged sprint cars that run mainly in the northeastern part of the United States in Pennsylvania, New Jersey, and Delaware. The URC started in 1948 with 11 races in its season. It slowly progressed to 28 races. The URC uses

1900-490: Is also typically the facility's responsibility of having an ambulance on site that meets DOT standards, fire equipment and staff, properly licensed medical staff and equipment, track communications, and safety equipment such as tow trucks. It is common for a facility to be visited prior to an event for inspection and updates be made prior to the event taking place. Power-to-weight ratio Power-to-weight ratio ( PWR , also called specific power , or power-to-mass ratio )

1976-402: Is an important vehicle characteristic that affects the acceleration of sports vehicles. Propeller aircraft depend on high power-to-weight ratios to generate sufficient thrust to achieve sustained flight, and then for speed. Jet aircraft produce thrust directly . Power-to-weight ratio is important in cycling, since it determines acceleration and the speed during hill climbs . Since

2052-417: Is conversely usually lower. Fuel cells and flow cells , although perhaps using similar chemistry to batteries, do not contain the energy storage medium or fuel . With a continuous flow of fuel and oxidant, available fuel cells and flow cells continue to convert the energy storage medium into electric energy and waste products. Fuel cells distinctly contain a fixed electrolyte whereas flow cells also require

2128-500: Is equal to thrust per unit mass multiplied by the velocity of any vehicle. The power-to-weight ratio (specific power) is defined as the power generated by the engine(s) divided by the mass. In this context, the term "weight" can be considered a misnomer, as it colloquially refers to mass. In a zero-gravity (weightless) environment, the power-to-weight ratio would not be considered infinite. A typical turbocharged V8 diesel engine might have an engine power of 250 kW (340 hp) and

2204-420: Is independent of the vehicle's size. Power-to-weight is often quoted by manufacturers at the peak value, but the actual value may vary in use and variations will affect performance. The inverse of power-to-weight, weight-to-power ratio (power loading) is a calculation commonly applied to aircraft, cars, and vehicles in general, to enable the comparison of one vehicle's performance to another. Power-to-weight ratio

2280-499: Is only delivered if the powerplant is in motion, and is transmitted to cause the body to be in motion. It is typically assumed here that mechanical transmission allows the powerplant to operate at peak output power. This assumption allows engine tuning to trade power band width and engine mass for transmission complexity and mass. Electric motors do not suffer from this tradeoff, instead trading their high torque for traction at low speed. The power advantage or power-to-weight ratio

2356-418: Is owned and operated by World Racing Group , and was rebranded when the World of Outlaws Late Model Series was introduced. The Sprint Car Series has been sponsored by Monster Beverage 's NOS Energy Drink since 2019. The series is a national tour of high power to weight, custom fabricated sprint cars. The race cars feature large adjustable wings on the top and large rear tires that transfer their power to

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2432-885: Is the premier dirt sprint car racing series. Famous tracks featured in the series included the Eldora Speedway in Rossburg, Ohio , the Lernerville Speedway in Sarver, Pennsylvania, the Knoxville Raceway in Knoxville, Iowa and Williams Grove Speedway in Mechanicsburg, Pennsylvania . Each August, the Knoxville Raceway holds the Knoxville Nationals . In 1987, Australia followed suit with its own national series for winged sprint cars called

2508-405: Is then where: The useful power of an engine with shaft power output can be calculated using a dynamometer to measure torque and rotational speed , with maximum power reached when torque multiplied by rotational speed is a maximum. For jet engines the useful power is equal to the flight speed of the aircraft multiplied by the force, known as net thrust, required to make it go at that speed. It

2584-455: Is used when calculating propulsive efficiency . Thermal energy is made up from molecular kinetic energy and latent phase energy. Heat engines are able to convert thermal energy in the form of a temperature gradient between a hot source and a cold sink into other desirable mechanical work . Heat pumps take mechanical work to regenerate thermal energy in a temperature gradient. Standard definitions should be used when interpreting how

2660-819: The Premier Speedway (home of the Grand Annual Sprintcar Classic ) in Warrnambool , Victoria. There is also a single meeting Australian Sprintcar Championship which has been run since 1963 and has been run under various class names before finally settling on the Australian Sprintcar Championship in 1979. While non-Australian drivers are free to race in the WSS and other meetings including the various state championships, only Australian drivers are permitted in

2736-700: The World Series Sprintcars , founded by Adelaide based sedan driver and Speedway Park track promoter John Hughes. Famous Australian tracks used in the WSS have included Speedway Park/City in Adelaide, South Australia , Claremont Speedway and later Perth Motorplex in Perth , Western Australia, Valvoline Raceway in Sydney , New South Wales , Archerfield Speedway in Brisbane , Queensland, and

2812-405: The derivative with respect to time of the work done). The typically used metric unit of the power-to-weight ratio is W kg {\displaystyle {\tfrac {\text{W}}{\text{kg}}}\;} which equals m 2 s 3 {\displaystyle {\tfrac {{\text{m}}^{2}}{{\text{s}}^{3}}}\;} . This fact allows one to express

2888-474: The fundamental theorem of calculus has that power is given by F ( t ) ⋅ v ( t ) = m a ( t ) ⋅ v ( t ) = τ ( t ) ⋅ ω ( t ) {\displaystyle \mathbf {F} (t)\cdot \mathbf {v} (t)=m\mathbf {a} (t)\cdot \mathbf {v} (t)=\mathbf {\tau } (t)\cdot \mathbf {\omega } (t)} . where: In propulsion , power

2964-592: The "Beef Packers" team) (No. 83), Tony Stewart Racing (No. 20). After Brownfield Promotions' owner Fred Brownfield was killed in a crash, Kinser and principals of two other teams purchased the entire Brownfield promotion. That series folded after the 2006 season, while the Northwest tour, a regional tour, was sold. The SuperClean Summer of Money aired on ESPN2 starting in mid June 2008 with the World of Outlaws at Knoxville Raceway and for eight weeks straight leading up to

3040-663: The 1930s as a very common form of sprint car racing, still very popular today and also sanctioned by USAC , POWRI, and others. They are powered by four-cylinder engines developing around 350 horsepower (260 kW), but are only similar to their larger cousins in appearance. Mini sprints are similarly sized to midget cars, but have upright-style chassis and center-mounted, chain-driven four-cylinder motorcycle engines with displacements between 750 and 1200 cc. Micro sprints are small racecars that are smaller versions of full sprint cars. A starter class for striving sprint car enthusiasts. 250/270cc single-cylinder two-cycle and 600 cc are

3116-566: The Australian Championship meeting. The Grand Annual Sprintcar Classic at Warrnambool is the largest sprint car meeting in the world; in the 2014–15 season, the 2015 Classic race outdrew the Knoxville Nationals in entries. Until the early 2000s, sprint cars in Australia were restricted to 6200 cc (372 cui) V8 engines as opposed to the 410 cui (6.7 L) engines used in the United States and New Zealand. Brian Healey,

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3192-520: The Knoxville Nationals which were live on Speed. In 2015, the World of Outlaws had several races broadcast on CBS Sports Network . Knoxville Raceway has their weekly series as well as World of Outlaws and National Sprint League events on MavTV . USAC currently has some races televised on MavTV, primarily through Jack Slash Media's Dirty 30 highlights program. Other series such as the Lucas Oil ASCS Sprint Car Series, King of

3268-496: The Sacramento-based Australian who owned Parramatta City Raceway, pushed for the change in 2003 to follow both nations to 410. Today, Australia follows the standard 410 ci formula, and has both the 410 and 360 cui (5.9 L) formulae. Both formulae have separate Australian Championship meetings. Midget cars are smaller versions of a full size sprint car, normally non-wing only. Midgets date back to

3344-451: The US has resulted in a large number of groups and sanctioning bodies supporting wingless sprint cars. Wingless sprint cars are considered the traditional sprint cars, dating back to the first sprint cars in the 1930s and 1940s (that ultimately evolved into Indy cars). Today, they are essentially the same car as a winged sprint car, only without wings. In fact, many of them have the "stub outs" in

3420-793: The West Sprint Cars, King of the Wing Pavement Sprint Cars, and several weekly regional series on MavTV. In Australia, the World Series Sprintcars was formerly televised on free-to-air channel One HD . In New Zealand, the Hydraulink War of the Wings is streamed only by RJPTV on a pay per video program. However Sprintcar racing can be seen from Western Springs in Auckland or the Bay per View from Baypark Speedway

3496-423: The World of Outlaws to designate legal tire compounds for a circuit among different compounds available to competitors, as the tire must suitably respond to the track surface. Tire technicians will reject certain compounds at certain circuits if they are unfit for the surface or may provide an unfair advantage. The series' cars have a large top mounted wing with sideboards that face opposite directions to help produce

3572-544: The biggest Sprintcar track in New Zealand Safety in sprint car racing has continuously evolved over the years as the cars have gotten faster and teams look to garner any advantage with weight and horsepower. While many regulations are centered around the class or division, each sanctioning body typically has a section in its rulebook dedicated to safety. These can vary between sanctioning bodies, and many even set safety standards for those hosting an event. Some of

3648-407: The cheapest race cars that are very competitive, costing around $ 5,000. Most tracks are one sixth of a mile or less. Outlaw karts run side-mounted engines of various types. The beginner boxstock and boxstock divisions run pull start clone motors and are usually for the younger drivers first getting their start. The intermediate division run 250 cc dirt bike engines with the drivers or teams having

3724-419: The choice of running a four-stroke or a two-stroke. At some tracks, the intermediate division has to run a harder compound of tire. The biggest division in outlaw karts is the open division. The opens can run 450 cc four strokes, 500 cc two strokes, or 550 cc four-strokes. The 450 cc and 500 cc motors are the more popular options because the 550 cc motors are not run at all tracks, and

3800-458: The dielectric medium to nanopores and a very thin high permittivity separator. While capacitors tend not to be as temperature sensitive as batteries, they are significantly capacity constrained and without the strength of chemical bonds suffer from self-discharge. Power-to-weight ratio of capacitors is usually higher than batteries because charge transport units within the cell are smaller (electrons rather than ions), however energy-to-weight ratio

3876-464: The dirt tracks they race on. The series travels primarily the United States, but has sanctioned races in Canada, Mexico, and Australia. The series was founded in 1978 by Ted Johnson, a former midget racer from Madison, Wisconsin . At the time sprint car racing in the United States lacked a true national series. Johnson organized the World of Outlaws sanctioning body and established a national schedule,

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3952-436: The engine's combustion chamber. The original liquid hydrogen turbopump is similar in size to an automobile engine (weighing approximately 352 kilograms (775 lb)) and produces 72,000 hp (54 MW) for a power-to-weight ratio of 153 kW/kg (93 hp/lb). In classical mechanics , instantaneous power is the limiting value of the average work done per unit time as the time interval Δ t approaches zero (i.e.

4028-451: The engines. Sprint Cars only have an in/out direct drive with a fixed gear ratio, no reverse gear and no clutch. Source: Note: Includes all full-field preliminary race wins. Those with a yellow background indicates Knoxville National winners. Updated November 9, 2024. Source: Here is a list of top paying and more popular race events each year. Most are two days or more. Final night features are usually based on points earned on

4104-540: The event, won by Kraig Kinser. In 2003, Johnson sold his organization to DIRT Motorsports . Because of complaints about DIRT Motorsports and the lack of television coverage, Northwest Sprint Tour owner Fred Brownfield formed the National Sprint Tour as a rival to the World of Outlaws Sprint for the 2006 season. Notable teams in the NST included Steve Kinser Racing (No. 11), Roth Motorsports (sometimes known as

4180-601: The frame for adding wings. They generally use the same 410 cubic inches (6,700 cc) and 360 cubic inches (5,900 cc) aluminum engines as their winged counterparts (although many local tracks have rules mandating steel blocks and some 305 cubic inches (5,000 cc) displacements, this is mostly a cost control). Some newer regional groups, specifically POWRi and Elite have chosen to allow open engines with no limit to engine size. Their tuning and gearing are different for performance at lower RPMs than winged cars. Chassis set ups and tires are also different. While they do not have

4256-439: The front and top of their cars. The added wings increase the downforce generated on the car, with the opposite direction of the sideboards helping to turn the car in the corners. The increased traction makes the car faster and easier to control. The wing also affects safety. The added downforce lessens the likelihood of going airborne. When cars do go airborne, the wings contact the ground first and break off or crumple upon hitting

4332-614: The full calendar in 2018. Select races are broadcast on delay nationally on the CBS Sports Network with MavTV showing the Knoxville Nationals since 2013. Previous broadcasters include The Nashville Network and Speed Channel shown live or on delay. A WoO Sprint Car must weigh at least 1,425 pounds (646kg) with the driver in the car. The mandated 410-cubic inch engine (6.7 litre) produces over 900 horsepower, uses mechanical fuel injection and must run on methanol fuel. The series' specification tire manufacturer works with

4408-416: The ground, lessening the impact on the driver and the car. For these reasons, winged cars are safer to drive. Often teams are able to replace the wing during the ensuing stoppage and are able to continue once the race resumes. In 1978, Ted Johnson formed the promotional body for winged sprint cars called the World of Outlaws . Racing throughout the United States from February to November, the World of Outlaws

4484-596: The history of both winged and wingless sprint cars. There are several sanctioning bodies for wingless sprint cars. Once dominant United States Automobile Club (USAC) became USAC/California Racing Association (USAC/CRA) after taking over the Sprint Car Racing Association (SCRA). USAC/CRA remains popular on the West Coast, East Coast and in Indiana . However, lack of leadership in much of

4560-409: The latter are sometimes called "micro midgets" or "600 cc sprints". The general minimum weights for the cars to pass tech is 775 lbs for winged and 725 lbs for non-wing. Micro sprints are generally a cheaper alternative than racing mini sprints or midget sprints, but they can be as expensive as full-sized sprint cars. Outlaw karts are go karts with roll cages and wings. They are some of

4636-421: The mechanical setup (engine, gearing, shocks, etc.) and the track layout, these cars can achieve speeds in excess of 160 miles per hour (260 km/h). A lower-budget and very popular class of sprint cars uses 360-cubic-inch (5.9L) engines that produce up to 775 horsepower. Sprint cars do not utilize a transmission but have an in-or-out gearbox and quick-change rear differentials for occasional gearing changes. As

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4712-415: The most common safety requirements placed on the teams are: an emergency shut-off switch, a quick-detach steering wheel, aluminum seats with high impact head rests with shock absorbing materials, fire resistant suits, underwear, shoes, and gloves, a full face helmet meeting that meets or exceeds a specified Snell or SFI rating, safety harness (most common is a 5-point harness) that meets a specified SFI rating,

4788-428: The most popular micro sprint classes. They run side-mounted 600 cc motorcycle engines developing around 140 hp and are chain driven. They have chassis and bodies styled like those of full-sized sprint cars or midgets. Micro sprints are generally run on small dirt tracks that are usually a fifth of a mile or less in size, though they sometimes run on larger tracks. They can be either raced with or without wings;

4864-442: The perception of sports car like performance or for other psychological benefit . Increased engine performance is a consideration, but also other features associated with luxury vehicles . Longitudinal engines are common. Bodies vary from hot hatches , sedans (saloons) , coupés , convertibles and roadsters . Mid-range dual-sport and cruiser motorcycles tend to have similar power-to-weight ratios. Power-to-weight ratio

4940-623: The popular PA message "you want the best, now you have them four abreast". The All Star Circuit of Champions (ASCoC) is an American motorsports sanctioning body of winged sprint car racing founded in 1970. The series sanctions 410ci sprint car races in Ohio, Indiana, Pennsylvania, Michigan, Illinois, Wisconsin, New York, and Florida. On average the series runs 40 races per year, starting February and ending in October each year. The United States Automobile Club (USAC) National Sprint Car Championship

5016-431: The power-to-weight ratio purely by SI base units . A vehicle's power-to-weight ratio equals its acceleration times its velocity; so at twice the velocity, it experiences half the acceleration, all else being equal. If the work to be done is rectilinear motion of a body with constant mass m {\displaystyle m\;} , whose center of mass is to be accelerated along a (possibly non-straight) line to

5092-701: The propulsive power of a jet or rocket engine is transferred to its vehicle. An electric motor uses electrical energy to provide mechanical work , usually through the interaction of a magnetic field and current-carrying conductors . By the interaction of mechanical work on an electrical conductor in a magnetic field, electrical energy can be generated . Fluids (liquid and gas) can be used to transmit and/or store energy using pressure and other fluid properties. Hydraulic (liquid) and pneumatic (gas) engines convert fluid pressure into other desirable mechanical or electrical work . Fluid pumps convert mechanical or electrical work into movement or pressure changes of

5168-488: The remainder of the World of Outlaws season to tape delay races. A tape delayed deal with Speed Channel followed for the next season. Television coverage began on the Outdoor Channel in 2003. Events are usually tape delayed for two weeks or more. The Knoxville Nationals were on Speed Channel. The 2004 Knoxville Nationals did not air as bad weather postponed the event, and there was not enough space for Speed to air

5244-516: The same top speed as a winged car (because they lack downforce for traction), they are thought by many to be more entertaining to watch. Their relative lack of grip creates different driving characteristics than their winged counterparts, causing them to be more difficult to control through the corners. This, and the lack of roll-over protection a wing provides, makes them more dangerous than winged cars and their crashes are known for their spectacular nature. The world's first small-track winged race car

5320-491: The suspension. Torsion bars, and specialty shock absorbers are the key ingredients in the handling of sprint cars. That coupled with the wings, tire stagger, light weight, and enormous horsepower make these cars some of the fastest race cars in the world. The monstrous power-to-weight ratios of Sprint Cars can exceed that of Formula 1 cars in the right circumstances. Sprint Cars have a very distinct stance since they have two very different sized rear tires. The right rear tire on

5396-491: The tracks that do run them make the kart weigh extra. The weight range for the karts is 150 lb to 500 lb. The NOS Energy Drink World of Outlaws (WoO) is a division of 410ci (6.7L) winged sprint cars that run all over the United States and have a few events in Canada. The cars have 15-inch (380 mm) wide right rear tires and 410 cubic inch engines with mechanical fuel injection. These sprint cars have no batteries or starters in them, necessitating push starts by

5472-500: The various state championships and other meetings held around the country. Unlimited (2018+) Despite over 50 years of sprint car racing, the category has only ever held one unofficial "world championship". This was in 1987 at the ⅓ mile (586 metres (641 yd)) Claremont Speedway in Perth , Western Australia. The event attracted a collection of drivers from Australia, NZ, Canada, and South Africa, as well as several World of Outlaws drivers. Australian veteran Garry Rush from Sydney ,

5548-516: The vehicle itself. In the sport of competitive cycling athlete's performance is increasingly being expressed in VAMs and thus as a power-to-weight ratio in W/kg. This can be measured through the use of a bicycle powermeter or calculated from measuring incline of a road climb and the rider's time to ascend it. A locomotive generally must be heavy in order to develop enough adhesion on the rails to start

5624-517: Was driven by Jim Cushman at the Columbus Motor Speedway (Ohio) in 1958. Cushman drove with his winged super-modified (wing created by Gene and Floyd Miller) in several races and even won with it, starting a new trend of winged cars in sprint and super-modified racing. By 1959, up to half of the field was racing with a wing at Columbus Motor Speedway. In the early 1970s, many sprint car drivers began to put wings with sideboards on both

5700-716: Was organized in 1915, and is currently the oldest active auto racing sanctioning body in the United States. It sanctions traditional 305 non-winged and winged sprint cars under the IMCA RaceSaver Sprint Car class. In Australia, sprint car racing is controlled by the Sprintcar Control Council of Australia (SCCA) who sanction the Australian Championships and the World Series Sprintcar series as well as

5776-557: Was started by well-known racing promoter Emmett Hahn. The series national headquarters were located in Tulsa, Oklahoma for much of its history, but moved to Concord, North Carolina in 2024 following World Racing Group's purchase of the series. The all-time leader in wins for the series is Texan Gary Wright with 127 A main victories under his belt. Engine rules for the non-wing cars vary by series with some having unlimited displacement engines. The International Motor Contest Association (IMCA)

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