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Class Information
Number: 244/69
Name: Aeronautics > Aircraft propulsion > Screw > Contra-propeller arrangements
Description: Fixed or static aircraft structure arranged to reduce the rotary motion of the slip-stream of screw propellers on aircraft.










Patents under this class:

Patent Number Title Of Patent Date Issued
8438829 Turboprop propulsion unit with pusher propeller May. 14, 2013
8408488 Safety flier--a parachute-glider air-vehicle with vertical take-off and landing capability Apr. 2, 2013
8256709 Aircraft with tail propeller-engine layout Sep. 4, 2012
7661624 Aerodynamic lifting-thrusting propulsion device Feb. 16, 2010
6615165 Cable connections between an unmanned aircraft and a detachable data handling module Sep. 2, 2003
5810288 High velocity propeller Sep. 22, 1998
5810289 High velocity propeller Sep. 22, 1998
5807149 Airboat systems and methods for increasing engine efficiency while reducing torque and noise Sep. 15, 1998
5653404 Disc-shaped submersible aircraft Aug. 5, 1997
5645250 Multi-purpose aircraft Jul. 8, 1997
5381985 Wingtip mounted, counter-rotating proprotor for tiltwing aircraft Jan. 17, 1995
5054998 Thrust reversing system for counter rotating propellers Oct. 8, 1991
4936526 Foldable counter-rotating propfan blades Jun. 26, 1990
4934630 Powered airfoil canopy aircraft Jun. 19, 1990
4883240 Aircraft propeller noise reduction Nov. 28, 1989
4828205 Device for carrying and lifting loads and moving same by aerodynamic lifting May. 9, 1989
4796424 Intake for a turbopropeller gas turbine engine Jan. 10, 1989
4500053 Propeller and engine mounting device Feb. 19, 1985
4426049 Dual propeller and engine drive system for aircraft Jan. 17, 1984
4402475 Thrusters for airship control Sep. 6, 1983











 
 
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