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Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:27
Le Hiller VZ-1 Pawnee sur Wikipedia.en
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The Hiller VZ-1 Pawnee (U.S. Army designation; earlier Army designation: HO-1) was a unique direct lift rotor aircraft, using contra-rotating ducted fans inside a platform that the single pilot stood upon for lift, and controlled by the pilot shifting his body weight around to tilt the platform.
The platform was developed starting in 1953 under an Office of Naval Research contract to Hiller Aircraft Corporation, and flew successfully starting in 1955.
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The Hiller VZ-1 Pawnee (U.S. Army designation; earlier Army designation: HO-1) was a unique direct lift rotor aircraft, using contra-rotating ducted fans inside a platform that the single pilot stood upon for lift, and controlled by the pilot shifting his body weight around to tilt the platform.
The platform was developed starting in 1953 under an Office of Naval Research contract to Hiller Aircraft Corporation, and flew successfully starting in 1955.
Griffith- CLUB
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Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:28
Design and development
The original concept had been developed by Charles H. Zimmerman in the late 1940s. Further elaboration followed, both by Hiller and the De Lackner Company.
There were two main models, the ONR model, and a somewhat larger VZ-1 Pawnee model produced in 1956 for the U.S. Army. Three of each model were built as prototypes. Neither of the variants was put into production.
The original concept had been developed by Charles H. Zimmerman in the late 1940s. Further elaboration followed, both by Hiller and the De Lackner Company.
There were two main models, the ONR model, and a somewhat larger VZ-1 Pawnee model produced in 1956 for the U.S. Army. Three of each model were built as prototypes. Neither of the variants was put into production.
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Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:30
The smaller models used two 44 horsepower Nelson H-59 piston engines.
The larger models used three of the aforementioned engine and had an extended duct area.
The largest variant had ineffective "kinesthetic control" and instead had the operator seated on a platform controlling the flight with conventional helicopter controls.
The larger models used three of the aforementioned engine and had an extended duct area.
The largest variant had ineffective "kinesthetic control" and instead had the operator seated on a platform controlling the flight with conventional helicopter controls.
Griffith- CLUB
- Messages : 460
Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:32
Testing and evaluation
Due to aerodynamic effects in the duct within which the propellers rotated, the platform was dynamically stable, even though the pilot and center of gravity of the platform were fairly high up.
In testing, the prototypes flew well enough, but the U.S. Army judged them to be impractical as combat vehicles as they were small, limited in speed and only barely flew out of the ground cushion effect.
Due to aerodynamic effects in the duct within which the propellers rotated, the platform was dynamically stable, even though the pilot and center of gravity of the platform were fairly high up.
In testing, the prototypes flew well enough, but the U.S. Army judged them to be impractical as combat vehicles as they were small, limited in speed and only barely flew out of the ground cushion effect.
Griffith- CLUB
- Messages : 460
Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:34
Two of the six prototypes are known to survive today — one ONR smaller model at the Hiller Aviation Museum in San Carlos, California, and one VZ-1 Pawnee model at the National Air and Space Museum in Washington, D.C.
The latter craft was formerly on loan to the Pima Air Museum.
The latter craft was formerly on loan to the Pima Air Museum.
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Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:34
Specifications (VZ-1 Pawnee)
General characteristics
* Crew: one
* Length: 8 ft 4 in (diameter) (2.5 m)
* Wingspan: ()
* Height: 7 ft (2.1 m)
* Empty weight: 370 lb (167.8 kg)
* Powerplant: 6× 2 x Nelson H-56 piston engines, 40 hp (30 kW) each
General characteristics
* Crew: one
* Length: 8 ft 4 in (diameter) (2.5 m)
* Wingspan: ()
* Height: 7 ft (2.1 m)
* Empty weight: 370 lb (167.8 kg)
* Powerplant: 6× 2 x Nelson H-56 piston engines, 40 hp (30 kW) each
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Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:37
Performance
* Maximum speed: 16 mph (26 km/h)
* Service ceiling: 32.8 ft (10 m)
* Maximum speed: 16 mph (26 km/h)
* Service ceiling: 32.8 ft (10 m)
Griffith- CLUB
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Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:37
Armament
* standard combat weapons for a U.S. soldier
* standard combat weapons for a U.S. soldier
Griffith- CLUB
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Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:39
Bibliography
* Winchester, Jim. The World's Worst Aircraft: From Pioneering Failures to Multimillion Dollar Disasters. London: Amber Books Ltd., 2005. ISBN 1-904687-34-2.
* Winchester, Jim. The World's Worst Aircraft: From Pioneering Failures to Multimillion Dollar Disasters. London: Amber Books Ltd., 2005. ISBN 1-904687-34-2.
Griffith- CLUB
- Messages : 460
Re: Hiller VZ-1 Pawnee
par Griffith Mar 17 Aoû 2010, 21:40
External links
* Information on the Hiller Flying Platform, plus a video documentary
* Hiller Aviation Museum article on Platform
* National Air and Space Museum article on Platform
* Information on the Hiller Flying Platform, plus a video documentary
* Hiller Aviation Museum article on Platform
* National Air and Space Museum article on Platform
Griffith- CLUB
- Messages : 460
aeronewsline :: Accueil :: Histoire :: Aéronefs 1945 à 1955
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