Ryan YO-51 Dragonfly
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Ryan YO-51 Dragonfly
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The YO-51 Dragonfly was a United States prototype observation aircraft built for the US Army by Ryan Aeronautical.
Typical for aircraft of its type, it was a high-wing braced parasol wing monoplane with fixed tailwheel undercarriage, a two-seat open cockpit, and full-span slots and Fowler flaps for STOL capability.
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The YO-51 Dragonfly was a United States prototype observation aircraft built for the US Army by Ryan Aeronautical.
Typical for aircraft of its type, it was a high-wing braced parasol wing monoplane with fixed tailwheel undercarriage, a two-seat open cockpit, and full-span slots and Fowler flaps for STOL capability.
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According to Harlan D. Fowler, in his book "The Fowler Flap, An Engineering Handbook", at gross weight, the YO-51 would, without flaps, take off after a run of only 400 feet, while, with full flaps, the take off run would be only 75 feet, or just four feet more than twice its own length.
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Three examples were purchased for evaluation against the Stinson YO-49 and Bellanca YO-50.
The Stinson machine won the production contract and no further YO-50s were built.
The Stinson machine won the production contract and no further YO-50s were built.
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Specifications
General characteristics
* Crew: two, pilot and observer
* Length: 35 ft 6 in (10.51 m)
* Wingspan: 52 ft 0 in (15.85 m)
* Gross weight: 4206 lb (1908 kg)
* Powerplant: 1 × Pratt & Whitney R-985-21 Wasp Junior radial, 440 hp (328 kW)
General characteristics
* Crew: two, pilot and observer
* Length: 35 ft 6 in (10.51 m)
* Wingspan: 52 ft 0 in (15.85 m)
* Gross weight: 4206 lb (1908 kg)
* Powerplant: 1 × Pratt & Whitney R-985-21 Wasp Junior radial, 440 hp (328 kW)
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Performance
* Maximum speed: 129 mph (208 km/h)
* Cruise speed: 107 mph (172 km/h)
* Maximum speed: 129 mph (208 km/h)
* Cruise speed: 107 mph (172 km/h)
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Reference
* Donald, David (1997). Complete Encyclopedia of World Aircraft. London: Orbis Publishing Ltd. pp. 794. ISBN 0-7607-0592-5.
* Donald, David (1997). Complete Encyclopedia of World Aircraft. London: Orbis Publishing Ltd. pp. 794. ISBN 0-7607-0592-5.
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Re: Ryan YO-51 Dragonfly
Si vous avez d'autres sources, images ou plans... ?
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