hinges allowed each rotor blade to flap, or move up and down, to compensate for dissymmetry of lift, the difference in lift produced between the right and left sides of the rotor as the autogyro moves forward. Three days later, the engine failed shortly after takeoff and the aircraft descended steeply but slowly to a safe landing, validating de la Cierva's efforts to produce an aircraft that could be flown safely at low airspeeds.

Cierva developed his C.6 model