![]() If the planned 600-mile (966 km) race had taken place, the drivers would have gone back and forth between 5 and nearly zero g a total of 800 times. It only takes about 4 seconds to make it down the backstretch before the next turn and another 6.5 seconds of almost 5 g. Sinusoidal Vibration Velocity, Acceleration and Displacement Relationships English Metric V fD V fD V 61.48 X g f D inches peak to peak V 1.56 X g f D meters peak to peak g 0.0511 f2 D V inches per second g 2.013 f2 D V meters per second g 0.016266Vf f frequency in Hertz (Hz) g 0.641 Vf f frequency in Hertz. The Texas Motor Speedway is 1.5 miles (2.4 km) long: The front stretch is 2,250 feet (686 m) long, and the backstretch is 1,330 feet (405 m) long.Īt 230 mph (337 f/s), the drivers take about 6.5 seconds to go down the front stretch, and then they are slammed by almost 5 g of force for the next 6.5 seconds as they go around the turn. Even more impressive is how long these drivers tolerate this kind of force. Even the space shuttle only develops 3 g when it takes off. This level of acceleration is higher than most people ever experience. Final Thoughtsĭrivers take an enormous amount of punishment on a track like this. The amount of downforce is amazing - once the car is traveling at 200 mph (322 kph), there is enough downforce on the car that it could actually adhere itself to the ceiling of a tunnel and drive upside down! In a street-course race, the aerodynamics have enough suction to lift manhole covers - before the race, all of the manhole covers are welded down to prevent this from happening!īetween the downforce and the g-forces, well over four times the weight of the car holds the tires to the track when it goes around one of those 24-degree banked turns at 230 mph. The downforce keeps the car glued to the track with a downward pressure provided by the front and rear wings, as well as by the body itself. A Champ Car has spoilers like upside-down wings, providing the opposite of lift: downforce. The car's aerodynamics also create significant downforce at 230 mph. Together, 2.84 g (or 2.84 times the car's weight) push down on the car during the turn, helping it stick to the track. In addition, a portion of the 1 g from Earth's gravity also puts some weight on the tires: 1 g x cos24° = 0.91 g. ![]() So, with a 24-degree banking, 1.93 g adds weight to the wheels. To figure out what portion of the g-force gets adds weight to the tires, you multiply the g-forces by the sine of the banking degree. Traction is proportional to the weight on the tires (the more weight, the more traction).īanking a turn allows some of the g-forces created in the turn to increase the weight on the tires, increasing the traction. If a Champ Car tried to make a flat turn at 230 mph, it would slide right off the track because it doesn't have enough traction. The banking doesn't affect how we calculate the g-forces on the driver, but without the banking, the cars could never go around such a tight turn at 230 mph. The Texas Motor Speedway has 24-degree banking in the turns. ![]() How can the car stay on the track under this kind of force? It's because of the banked turns. 151 / 32 = 4.74 g experienced by the drivers. ![]() The acceleration due to gravity (1 g) is 32 f/s2. ![]()
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