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aerodynamic drag aeronaut aircraft airfoil airplane airship altitude angle of attack attached aviation axle ballast balloon bicycle bicycle frame Bill Watson blade bottom bracket brake Bryan Allen camber chain chainring chord climb coefficient component craft crank crankset cu.ft curve cyclist diameter dirigible efficiency engine envelope fabric feet flight flow frame freewheel front fuselage Gallagher gear gondola Gossamer Albatross hangar helium horsepower hour human-powered aircraft human-powered vehicles inches induced loss induced velocity Kremer Kremer prize length lift load machine maximum meters miles Model motor Muscle Powered Blimps operate Paul MacCready pedal power percent pilot pitch Plate pounds pressure prop propeiier propeller race radius rear resistance rider Ritchell rotating rotor rudder screw seat shaft shape Skycycle Sprocket Steel streamlined surface theory Thermal thrust trailing edge tube ultralight Vector vortex sheet watts weight wheel White Dwarf wind wing