Douglas YOA-5

YOA-5
Role	Seaplane bomber
Manufacturer	Douglas Aircraft Company
First flight	1935
Introduction	1935
Retired	1943
Status	Prototype
Primary user	United States Army Air Corps
Number built	1
Developed from	Douglas 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

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

United States

United States Army Air Corps

Variants

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)

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: 212 ft 0 in (64.62 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

References

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

Bibliography

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

External links

Zdroj:https://en.wikipedia.org?pojem=Douglas_YOA-5
Text je dostupný za podmienok Creative Commons Attribution/Share-Alike License 3.0 Unported; prípadne za ďalších podmienok. Podrobnejšie informácie nájdete na stránke Podmienky použitia.

[1] "Fact Sheets: Douglas YB-11". National Museum of the United States Air Force™. Archived from the original on 26 Aug 2007.

[Fran_p192-2] Francillon 1979, p.192.

[3] Wagner, Ray, American Combat Planes, 1981, Doubleday & Company, Garden City, New York, ISBN 9780385131209, page 307

[Fran_p192-3-4] Francillon 1979, pp. 192–193.

[Francillon-5] Francillon, René J. (1988). McDonnell Douglas aircraft since 1920 : Volume I. London: Naval Institute Press. pp. 184–193. ISBN 0870214284.

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v t e Douglas military aircraft
Fighters	XFD XP-48 P-70 F3D Skyknight F4D Skyray F5D Skylancer XF6D Missileer
Ground attack	XA-2 A-20 A-24 A-26 Invader A-33 A-1 Skyraider A-3 Skywarrior A-4 Skyhawk/A-4AR Fightinghawk/A-4SU Super Skyhawk AC-47 "Spooky" DT T2D XT3D TBD Devastator SBD Dauntless BD XBTD Destroyer XTB2D Skypirate AD Skyraider XA2D Skyshark A3D Skywarrior A4D Skyhawk
Bombers	YB-7 YB-11 B-18 Bolo XB-19 XB-22 B-23 Dragon B-26 Invader XB-31 XB-42 Mixmaster XB-43 Jetmaster B-66 Destroyer Model 423 Model 1211-J DB-1 DB-2 DB-7 DB-8 DB-19 DB-73 Boston I/II/III/IV/V Digby I Havoc I/II DXD1
Observation	O-2 OD O2D O-31 O-35 O-38 O-43 YO-44 O-46 O-53 YOA-5
Patrol	PD P2D P3D
Reconnaissance	F-3
Transports	C-1 C-21 C-32 C-33 YC-34 C-38 C-39 C-41 C-41A C-42 C-47 Skytrain (Dakota I/III/IV) C-48 C-49 C-50 C-51 C-52 C-53 Skytrooper C-54 Skymaster C-58 UC-67 C-68 C-74 Globemaster C-84 C-110 XC-112/YC-112 XC-114 YC-116 C-117 C-117D C-118 C-124 Globemaster II YC-129 C-132 C-133 Cargomaster C-9 (Nightingale/Skytrain II) C-24 RD R2D R3D R4D-1/-3/-5/-6/-7 R4D-8 R5D JD R6D CC-129 LXD1 PD.808 Skymaster I
Gliders	XCG-17
Training aircraft	BT-1 BT-2 XT-30
Experimental	World Cruiser D-558-1 Skystreak D-558-2 Skyrocket X-3 Stiletto

v t e USAF amphibious aircraft designations
Observation Amphibian "OA" (1925-1947)	OA-1 OA-2 OA-3 OA-4 OA-5 OA-6 OA-7 OA-8 OA-9 OA-10 OA-11 OA-12 OA-13 OA-14 OA-15 OA-16
Amphibian "A" (1948-1962)	A-9 A-10 A-12 A-16
Not to be confused with the Attack or Aerial target sequences.

YOA-5

Role	Seaplane bomber Type of aircraft
Manufacturer	Douglas Aircraft Company
First flight	1935
Introduction	1935
Retired	1943
Status	Prototype
Primary user	United States Army Air Corps
Number built	1
Developed from	Douglas XP3D