Faster and Greener-- Pocket Airports - CAFE Foundation

40 Such a motor can be used to replace main landing gear disc brakes with little or noweight penalty to a small aircraft. Replacing the disc brake with such a motor can provideunprecedented capabilities to the GQ aircraft, including:• Near-silent taxiing• Quieter acceleration• Excellent horsepower to weight ratio (BMW Mini uses 160 BHP per wheel !!)• Lessens the horsepower needed through noisy prop• Anti-lock braking• Anti-skid• Steer-by-wire• Self-retracting landing gear• Tire Spool-up prior to landing touchdown• Regenerative braking• Golf cart-DOT 500 functionality if wings fold.The benefit of motor-in-wheel acceleration on take off can be appreciated by the graphsbelow. The first of these (below) shows that the direct application of horsepower towhere the ‘rubber meets the runway’ can produce excellent short ground roll distancesfor V/ESTOL aircraft. The second graph shows the very poor propeller efficiency thataccompanies the initial part of the aircraft’s ground roll, where forward speed is only 3mph. This indicates that the motor-in-wheel can contribute a dramatic improvement totake off distance by its direct and highly efficient application of power to the pavement.