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0.20 manikin tight 0.22 Complete wheelchair Aerodynamic Characteristics AERODYNAMIC COEFFICIENTS aerodynamic drag characteristics arm rests cD cL Cm CHARACTERISTICS OF WHEELCHAIRS cL Cm Complete Cm Complete wheelchair COMPONENT BUILDUP STUDIES Configuration Figure cD conventional wheelchair DETERMINED FROM COMPONENT drag is simply experience an aerodynamic fiftieth percentile Figure cD cL force with head-wind friction drag Friction force ground effects head-wind velocity individual drag contributions Langley Research Center Langley V/STOL tunnel m/sec 2 mph manikin loose clothes manikin tight clothes modified back modified chair back NASA negative lift order of 1.4 overall aerodynamic drag percentile man sitting Performing Organization plete wheelchair power required presented in figure REFERENCE CENTER Rehabilitation Engineering Center required to overcome retarding force study was conducted tests were conducted U.S. Department University of Virginia various wheelchair components vertical center line wheelchair fig Wheelchair mounted wheelchair with manikin wheelchair with modified Wheelchair Without Manikin wheelchair would experience wheels wind-tunnel vertical center