A wobble plate motor comprises a rotatable shaft having a bent end rigid with the shaft and an inclined plate journalled on the bent end. When only one side of the inclined plate is directly subjected to high pressure, the plate rolls on a base in the manner of a spinning coin as it decays, i.e. as its spin rate falls to a value where the coin is inclined to the axis of rotation. As the plate rotates, torque is generated on the rotatable shaft so the shaft may drive a work consumer such as a generator, pump or compressor.