US PATENT SUBCLASS 244 / 69
.~.~ Contra-propeller arrangements

Current as of: June, 1999
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244 /   HD   AERONAUTICS

62  DF  AIRCRAFT PROPULSION {7}
65  DF  .~ Screw {4}
69.~.~ Contra-propeller arrangements

DEFINITION

Classification: 244/69

(under subclass 65) Fixed or static aircraft structure arranged to reduce the rotary motion of the slip-stream of screw propellers on aircraft.

SEE OR SEARCH CLASS

440, Marine Propulsion,

66+, for similar arrangements of marine propellers.