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Douglas YOA-5

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(Redirected from Douglas YB-11)
YOA-5
General information
TypeSeaplane bomber
ManufacturerDouglas Aircraft Company
StatusPrototype
Primary userUnited States Army Air Corps
Number built1
History
Introduction date1935
First flight1935
Retired1943
Developed fromDouglas XP3D

The Douglas YOA-5 was an amphibious aircraft designed for the United States Army Air Corps, based on the Navy's Douglas XP3D.[1] Although a prototype was built, it did not enter production.

Design and development

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In November 1932, the U.S. Army ordered the development of an amphibious reconnaissance aircraft/bomber, intended to act as navigation leaders and rescue aircraft for formations of conventional bombers. The resultant aircraft, which was ordered under the bomber designation YB-11, was designed in parallel with the similar but larger Douglas XP3D patrol flying boat for the United States Navy. It was a high-winged monoplane with two Wright R-1820 Cyclone radial engines mounted in individual nacelles above the wing, resembling an enlarged version of the Douglas Dolphin.[2]

Prior to completion, it was redesignated firstly as an observation aircraft YO-44 and then as the YOA-5 'observation amphibian model 5'.[3] It first flew during January 1935, and was delivered to the army during February that year.[2] The concept for which it was designed proved impracticable, and no further production ensued, but the YOA-5 was used to set two world distance records for amphibians, being finally scrapped in December 1943.[4]

Operators

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 United States

Variants

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YB-11
An amphibious reconnaissance bomber ordered in 1932 by the US Army Air Corps, powered by 2x Wright R-1820-13 Cyclone radial engines.
YO-44
The YB-11 redesignated in the Observation category before completion.
YOA-5
Another redesignation to the Observation Amphibian category. One built, given the aforementioned designations at various times in its life. The YOA-5 started life with Wright R-1820-13 Cyclone engines, was re-engined with 930 hp (690 kW) Wright YR-1820-45 Cyclone engines for experimental long-range flying, then re-engined again with 750 hp (560 kW) Wright R-1820-25 Cyclones.

Specifications (YOA-5)

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Data from McDonnell Douglas aircraft since 1920 : Volume I[5]

General characteristics

  • Crew: 4
  • Length: 69 ft 6 in (21.18 m)
  • Wingspan: 89 ft 9 in (27.36 m)
  • Height: 21 ft 2 in (6.46 m)
  • Gross weight: 20,000 lb (9,072 kg)
  • Powerplant: 2 × Wright R-1820-25 Cyclone 9-cylinder air-cooled radial piston engines, 750 hp (560 kW) each

Performance

  • Maximum speed: 169 mph (272 km/h, 147 kn) at sea level
  • Power/mass: 0.075 hp/lb (0.123 kW/kg)

Armament

  • Guns: 3× .30 in (7.62 mm) machine guns in open bow and fuselage positions

See also

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Related lists

References

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  1. ^ "Fact Sheets: Douglas YB-11". National Museum of the United States Air Force™. Archived from the original on 26 Aug 2007.
  2. ^ a b Francillon 1979, p.192.
  3. ^ Wagner, Ray, American Combat Planes, 1981, Doubleday & Company, Garden City, New York, ISBN 9780385131209, page 307
  4. ^ Francillon 1979, pp. 192–193.
  5. ^ Francillon, René J. (1988). McDonnell Douglas aircraft since 1920 : Volume I. London: Naval Institute Press. pp. 184–193. ISBN 0870214284.

Bibliography

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  • Francillon, René. McDonnell Douglas Aircraft since 1920. London:Putnam, 1979. ISBN 0-370-00050-1.
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