US PATENT SUBCLASS 244 / 17.21
.~.~.~ Auxiliary rotor

Current as of: June, 1999
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244 /   HD   AERONAUTICS

4 R  DF  AIRCRAFT, HEAVIER-THAN-AIR {14}
17.11  DF  .~ Helicopter or auto-rotating wing sustained, i.e., gyroplanes {7}
17.19  DF  .~.~ With auxiliary propulsion, counter-troque or steering device {1}
17.21.~.~.~ Auxiliary rotor

DEFINITION

Classification: 244/17.21

(under subclass 17.19) Gyroplanes in which the additional means is rotatable.

(1) Note. This subclass includes those devices which include a rotary as well as a nonrotary means for auxiliary propulsion, countertorque or steering.

SEE OR SEARCH CLASS

416, Fluid Reaction Surfaces (i.e., Impellers),

120+, for plural impellers which are relatively movable and/or have different axes in which no more aircraft structure is included than is necessary to mount the impellers. See (3) Note, subclass 17.11, this class (244), for the line.