|5931637||Propeller with variable rate of pitch change|
A propeller is controlled to change pitch at at least two different rates. In one embodiment, an electric motor is provided with a high or low voltage for driving a pitch change mechanism at a high or low change rate. Preferably the rate is selected autom...
|5762474||Variable-pitch propeller assembly enabling pitch reversal during operation|
A propeller unit, each blade (1) being fixed to a blade foot (2) rendered integral with a hub (3) rotating around an axis but mobile with respect to the hub on translation in the direction of the axis and rotating around a second axis orthogonal to the fi...
|3986686||Aircraft with retractable rotor wing|
An aircraft having a rotor wing which in one position is locked against the irframe for forward flight, and in another position is extended clear of the airframe. In the extended position the wing is rotated and the tip portions are controllable in the man...