(under subclass 17.11) Gyroplanes combined with means in addition to the rotating wing and operating during flight to (1) propel the craft, (2) counteract the torque of the rotating wing, or (3) steer the aircraft.
(1) Note. The steering means of this subclass, i.e., so-called aerial steering, is directed to devices auxiliary to the rotating wing of the aircraft to effect steering in flight. Such auxiliary devices may include shiftable weights to change the center of gravity of the craft or a rudder on the craft.
SEE OR SEARCH THIS CLASS, SUBCLASS:
17.15, for auxiliary propulsion, counter-torque or steering devices combined with a safety lowering device, and 17.17, for similar subject matter combined with a landing, mooring or nonaerial propelling or steering device.
17.21, for devices having a rotary as well as a nonrotary means for auxiliary propulsion countertorque or steering.
235, for rudders for aircraft. SEE OR SEARCH CLASS
416, Fluid Reaction Surfaces (i.e., Impellers),
48+, and subclasses 147+ for steering by means of a variation in the thrust forces produced by the rotor itself, e.g., tiltable axis or collective pitch changes.
