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Automotive aerodynamics is studied using both computer modelling and wind tunnel testing. For the most accurate results from a wind tunnel test, the tunnel is sometimes equipped with a rolling road. This is a movable floor for the working section, which moves at the same speed as the air flow.
When empty, this car measures 231 ft (70 m) long; for comparison, a conventional boxcar currently operating on North American railroads has a single two-axle truck at each end of the car, measures 50 to 89 feet (15.24 to 27.13 m) long and has a capacity of 70 to 105 short tons (64 to 95 t; 63 to 94 long tons). The train's speed is limited to 25 ...
As of 2009, a set of trailer skirts cost between C$1500 and C$3000 (US$1300 to $2700). [4] Standard trailer skirts have an estimated payback period of ten to eighteen months, while "advanced" skirts (those that improve fuel efficiency by over 7%) are estimated to pay for themselves in seven to fourteen months.
[a] Because of its egg shape and bubble-like windows, it became known as a bubble car, a name also given to other similar vehicles. [ 8 ] In 1955, the BMW Isetta became the world's first mass-production car to achieve a fuel consumption of 3 l/100 km (94 mpg ‑imp ; 78 mpg ‑US ).
If you have a trailer with a lot of lights the diode and relay wiring is preferred, but if you have a trailer with a simple light arrangement it is usually sufficient to wire to 58L. In market there are many special converters [ 1 ] [ 2 ] [ 3 ] that solves the problem of connecting a car with European wiring to a trailer with North American wiring.
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Its nose is specifically designed to spoil a wind effect associated with passing through tunnels, and it can deploy 'ears' that slow the train in case of emergency by increasing its drag. Some modern race cars employ a passive situational spoiler called a roof flap. The body of the car is designed to generate downforce while driving forward.
Wind-powered vehicles derive their power from sails, kites or rotors and ride on wheels—which may be linked to a wind-powered rotor—or runners. Whether powered by sail, kite or rotor, these vehicles share a common trait: As the vehicle increases in speed, the advancing airfoil encounters an increasing apparent wind at an angle of attack ...