David F Gebhard, 70Portsmouth, RI

4524929, Jun 25, 1985

Sep 30, 1982

6/430657

David F. Gebhard - Northport NY

Grumman Aerospace Corporation - Bethpage NY

B64C 2526
B64C 2560

244 63

A telescoping energy-dissipating oleo landing gear shock strut set which can provide both the main landing gear and forward landing gear function, and which is affixed to an airplane, is restrained in an unenergized, shortened condition. A high pressure gas charge is then provided between the extendible element of the strut and the element affixed to the airplane. Early in the takeoff run, the charge gas in the forward strut is released so as to jump the nose and rotate the airplane to a high angle of attack appropriate for takeoff. Subsequent to this rotation, but before the conventional takeoff speed is reached, the charge gas in each of the main struts is released to impart a vertical velocity to the entire airplane, thus jumping it into the air. Both the forward strut and main struts incorporate a hydraulic flow bypass function, so that the landing shock dissipation function does not compromise the aforesaid energy release. The struts also incorporate valves to discharge enough residual gas immediately at the end of the jump stroke so that the landing energy dissipation mode is not compromised.

5145129, Sep 8, 1992

Jun 6, 1991

7/711058

David F. Gebhard - Northport NY

Grumman Aerospace Corporation - Bethpage NY

B64C 2900

244 125

An unmanned aircraft is provided which dual turbo shaft engines diving contra-rotating propellers. A bow plane provides pitch control during normal aircraft cruising. The contra-rotating propellers generate a slipstream for wing and tail sections that permit the aircraft to execute hover without the use of complicated tiltable rotor or jet assemblies.