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. 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.^[1]

Prior to completion, it was redesignated firstly as an observation aircraft YO-44 and then as the YOA-5 'observation amphibian model 5'. It first flew during January 1935, and was delivered to the army during February that year.^[1] 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.^[2]

Operators

United States

United States Army Air Corps

Variants

YB-11: An amphibious reconnaissance bomber ordered in 1932 by the US Army Air Corps.
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.

Specifications (YB-11)

General characteristics

Length: 69 ft 9 in (21.3 m)
Wingspan: 89 ft 9 in (27.4 m)
Height: 22 ft 0 in (6.7 m)
Wing area: 1,101 ft² (102.3 m²)
Empty weight: 14,038 lb (6,368 kg)
Loaded weight: 20,000 lb (9,000 kg)
Powerplant: 2 × Wright R-1820-45 Cyclone air-cooled radial piston engines, 800 hp (600 kW) each

Performance

Maximum speed: 169 mph (147 knots, 272 km/h)
Cruise speed: 152 mph (132 knots, 245 km/h)
Stall speed: 75 mph (65 knots, 120 km/h)
Range: mi (nm, km)
Service ceiling: 18,900 ft (5,760 m)
Rate of climb: 770 ft/min (3.9 m/s)
Wing loading: 18 lb/ft² (89 kg/m²)
Power/mass: 0.080 hp/lb (130 W/kg)

Armament

Guns: 3× .30 in (7.62 mm) machine guns

References

Notes

1 2 Francillon 1979, p.192.
↑ Francillon 1979, pp. 192—193.

Bibliography

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

External links

Wikimedia Commons has media related to Douglas YB-11.

Douglas military aircraft

Fighters	XP-48 P-70 F-6 F-10 XFD F3D F4D F5D XF6D

Ground attack	XA-2 A-20 A-24 A-26 A-33 A-1 A-3 A-4/A-4AR/A-4SU DT T2D XT3D TBD SBD BD XBTD XTB2D AD XA2D A3D A4D

Bombers	YB-7 YB-11 B-18 XB-19 XB-22 B-23 B-26 XB-31 XB-42 XB-43 B-66 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 C-48 C-49 C-50 C-51 C-52 C-53 C-54 C-58 UC-67 C-68 C-74 C-84 C-110 XC-112/YC-112 XC-114 YC-116 C-117 C-118 C-124 YC-129 C-133 C-9 C-24 RD R2D R3D R4D (R4D-2 & R4D-4) R5D JD R6D CC-129 Dakota I/III/IV Dakota II LXD1 PD.808 Skymaster I

Gliders	XCG-17

Training aircraft	BT-1 BT-2 XT-30

Experimental	DWC D-558-1 D-558-2 X-3

USAAS/USAAC/USAAF/USAF bomber designations, Army/Air Force and Tri-Service systems

Original sequences
(1924-1930)

Light Bomber	LB-1 LB-2 LB-3 LB-4 LB-5 LB-6 LB-7 LB-8 LB-9 LB-10 LB-11 LB-12 LB-13 LB-14

Medium Bomber	B-1 B-2

Heavy Bomber	HB-1 HB-2 HB-3

Main sequence
(1930-1962)

B-1
B-2
B-3
B-4
B-5
B-6
B-7
B-8
B-9
B-10
B-11
B-12
B-13
B-14
B-15
B-16
B-17
B-18
B-19
B-20
B-21
B-22
B-23
B-24
B-25
B-26
B-27
B-28
B-29
B-30
B-31
B-32
B-33
B-34
B-35
B-36
B-37
B-38
B-39
B-40
B-41
B-42
B-43
B-44
B-45
B-46
B-47
B-48
B-49
B-50
B-51
B-52
B-53
B-54
B-55
B-56
B-57
B-58
B-59
B-60
B-61
B-62
B-63
B-64
B-65
B-66
B-67
B-68
RB-69
B-70

Long-range Bomber
(1935-1936)

Oddities

Redesignated A-series	B-20 B-26

'FB-' designations	FB-111 FB-22

Tri-Service sequence
(1962-current)

See also: SR-71 (designation in bomber sequence)
Next-Generation Bomber ("B-3")
2037 Bomber

USAAC/USAAF observation aircraft

Observation	O-1 O-2 O-3 O-4 O-5 O-6 O-7 O-8 O-9 O-10 O-11 O-12 O-13 O-14 O-15 O-16 O-17 O-18 O-19 O-20 O-21 O-22 O-23 O-24 O-25 O-26 O-27 O-28 O-29 O-30 O-31 O-32 O-33 O-34 O-35 O-36 O-37 O-38 O-39 O-40 O-41 O-42 O-43 O-44 O-45 O-46 O-47 O-48 O-49 O-50 YO-51 O-52 O-53 O-54 O-55 O-56 O-57 O-58 O-59 O-60 O-61 O-62 O-63

Observation Amphibian	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 SA-16

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