Douglas YOA-5: Difference between revisions

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{{short description|American seaplane bomber prototype}}
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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.
The '''Douglas YOA-5''' was an [[amphibious aircraft]] designed for the [[United States Army Air Corps]], based on the Navy's [[Douglas XP3D]].<ref>{{Cite web |title=Fact Sheets: Douglas YB-11 |url=http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2505 |archive-url=https://web.archive.org/web/20070826121625/http://www.nationalmuseum.af.mil/factsheets/factsheet.asp?id=2505 |archive-date=26 Aug 2007 |website=National Museum of the United States Air Force™}}</ref> Although a prototype was built, it did not enter production.


==Design and development==
==Design and development==
Line 36: Line 37:
==Variants==
==Variants==
;YB-11
;YB-11
:An amphibious reconnaissance bomber ordered in 1932 by the US Army Air Corps.
: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
;YO-44
:The YB-11 redesignated in the Observation category before completion.
:The YB-11 redesignated in the Observation category before completion.
;YOA-5
;YOA-5
:Another redesignation to the Observation Amphibian category. One built, given the aforementioned designations at various times in its life.
: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 {{cvt|930|hp}} [[Wright YR-1820-45 Cyclone]] engines for experimental long-range flying, then re-engined again with {{cvt|750|hp}} [[Wright R-1820-25 Cyclone]]s.


==Specifications (YB-11)==
==Specifications (YOA-5)==
{{Aircraft specs
{{aircraft specifications
|ref=McDonnell Douglas aircraft since 1920 : Volume I<ref name="Francillon">{{cite book |last1=Francillon |first1=René J. |title=McDonnell Douglas aircraft since 1920 : Volume I |date=1988 |publisher=Naval Institute Press |location=London |isbn=0870214284 |pages=184–193}}</ref>
|prime units?=imp
<!--
General characteristics
-->
|crew=4
|capacity=
|length ft=69
|length in=6
|length note=
|span ft=89
|span in=9
|span note=
|height ft=212
|height in=0
|height note=
|wing area sqft=
|wing area note=
|aspect ratio=<!-- sailplanes -->
|airfoil=
|empty weight lb=
|empty weight note=
|gross weight lb=20000
|gross weight note=
|max takeoff weight lb=
|max takeoff weight note=
|fuel capacity=
|more general=
<!--
Powerplant
-->
|eng1 number=2
|eng1 name=[[Wright R-1820-25 Cyclone]]
|eng1 type=9-cylinder air-cooled radial piston engines
|eng1 hp=750


|prop blade number=<!-- propeller aircraft -->
|plane or copter?=plane
|prop name=
|jet or prop?=prop
|prop dia ft=<!-- propeller aircraft -->

|prop dia in=<!-- propeller aircraft -->
|crew=
|prop dia note=
|length main=69 ft 9 in
<!--
|length alt=21.3 m
Performance
|span main=89 ft 9 in
-->
|span alt=27.4 m
|max speed mph=169
|height main=22 ft 0 in
|max speed note=at sea level
|height alt=6.7 m
|cruise speed mph=
|area main=1,101 ft²
|cruise speed note=
|area alt=102.3 m²
|stall speed mph=
|empty weight main=14,038 lb
|stall speed note=
|empty weight alt=6,368 kg
|never exceed speed mph=
|loaded weight main=20,000 lb
|never exceed speed note=
|loaded weight alt=9,000 kg
|minimum control speed mph=
|max takeoff weight main=
|minimum control speed note=
|max takeoff weight alt=
|range miles=

|range note=
|number of props=2
|combat range miles=
|engine (prop)=[[Wright R-1820-45 Cyclone]]
|combat range note=
|type of prop= air-cooled radial piston engines
|ferry range miles=
|power main=800 hp
|ferry range note=
|power alt=600 kW
|endurance=<!-- if range unknown -->

|ceiling ft=
|max speed main=169 mph
|ceiling note=
|max speed alt=147 knots, 272 km/h
|g limits=<!-- aerobatic -->
|cruise speed main=152 mph
|roll rate=<!-- aerobatic -->
|cruise speed alt=132 knots, 245 km/h
|climb rate ftmin=
|stall speed main=75 mph
|climb rate note=
|stall speed alt=65 knots, 120 km/h
|time to altitude=
|ceiling main=18,900 ft
|wing loading lb/sqft=
|ceiling alt=5,760 m
|wing loading note=
|range main= mi
|fuel consumption lb/mi=
|range alt= nm, km
|power/mass={{cvt|0.075|hp/lb|kW/kg}}
|climb rate main=770 ft/min
|more performance=
|climb rate alt=3.9 m/s
<!--
|loading main=18 lb/ft²
Armament
|loading alt=89 kg/m²
-->
|power/mass main=0.080 hp/lb
|guns=3× .30 in (7.62 mm) [[M1919 Browning machine gun|machine gun]]s in open bow and fuselage positions
|power/mass alt=130 W/kg

|guns=3× .30 in (7.62 mm) [[M1919 Browning machine gun|machine gun]]s


|avionics=
}}
}}


==See also==
==See also==
{{aircontent
{{aircontent

|lists=
|lists=
* [[List of bomber aircraft]]
* [[List of bomber aircraft]]
* [[List of military aircraft of the United States]]
* [[List of military aircraft of the United States]]
* [[List of seaplanes and amphibious aircraft]]
* [[List of flying boats and floatplanes]]

|see also=
|see also=

}}
}}


==References==
==References==

===Notes===
{{Reflist}}
{{Reflist}}


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{{USAF bomber aircraft}}
{{USAF bomber aircraft}}
{{USAAF observation aircraft}}
{{USAAF observation aircraft}}
{{USAF amphibious aircraft}}


[[Category:Douglas aircraft|OA-5]]
[[Category:Douglas aircraft|OA-5]]
[[Category:United States bomber aircraft 1930–1939|Douglas B-11]]
[[Category:1930s United States bomber aircraft|Douglas B-11]]
[[Category:High-wing aircraft]]
[[Category:High-wing aircraft]]
[[Category:Amphibious aircraft]]
[[Category:Amphibious aircraft]]

Latest revision as of 14:33, 29 April 2024

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[edit]

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[edit]

 United States

Variants[edit]

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)[edit]

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

See also[edit]

Related lists

References[edit]

  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[edit]

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

External links[edit]

Wikimedia Commons has media related to Douglas YB-11.
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