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... radiation. Scanning ultraviolet spectrometer and a photometer were used. ''( NASA Rpts. SRL)'' A hingeless Lockheed XH-51N rotor helicopter for advanced research in rotary wing aircraft had been delivered to NASA Langley ... of simplicity and improved flying qualities could be realized in practice. Rotor blades on the XH-51N were held firmly to the hub, which was attached rigidly to the engine drive shaft ...

... cost of approximately $20 million. ''(NASA Release 64-146)'' NASA purchased hingeless rotor helicopter, the XH-51N Research Vehicle, from Lockheed Aircraft Corp. for use in flight research at LaRC. The cost ...

... from WTR with unidentified satellite payload. ''(U.S. Aeron, & Space Act, 1965, 143)'' Army Lockheed XH-51A, fastest helicopter in the world, demonstrated its rigid rotor system and auxiliary jet engine ... flight. It had a top speed of 272 mph, Without thrust from the engine, the XH-51A could be operated as a helicopter. ''(Wash. Post, 5/27/65, A7)'' An explosion ...

... to V/STOL aircraft. Agreement was concluded with U.K. to test-fly NASA's XH-51 rigid-rotor helicopter in U.K. and to share data. Agreements for new projects ...

... the race between education and catastrophe."' ''(Boston Globe, 5/3/63518)'' Revolutionary new helicopter, called XH-51A, was described in paper by Lockheed Aircraft Corp. engineers W. H. Statler, R. R ...

... year. ''(NASA Release 64 308)'' U.S. Army announced that the Lockheed-California Co.'s XH-51A compound helicopter ''(a helicopter having wings as well as rotor blades)'' had flown 242 ...

New world helicopter speed record of 133.9 mph at Niagara Falls, N.Y., claimed by XH-12 of Bell Aircraft Co. Media:1949-03-25 I12V08.pdf Langley Air Scoop Mar 25 1949

Hughes XH-17 Flying Crane helicopter completed first official flight.

Piloting a Sikorsky XH-39, Warrant Officer Billy I. Wester, USA, established a world helicopter altitude record of 24,500 feet at Bridgeport, Conn.

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