Douglas YOA-5

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.

Parked Douglas YB-11
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

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'.[2] 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.[3]


 United States


An amphibious reconnaissance bomber ordered in 1932 by the US Army Air Corps, powered by 2x Wright R-1820-13 Cyclone radial engines.
The YB-11 redesignated in the Observation category before completion.
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[4]

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


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


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

See also

Related lists


  1. ^ a b Francillon 1979, p.192.
  2. ^ Wagner, Ray, American Combat Planes, 1981, Doubleday & Company, Garden City, New York, ISBN 9780385131209, page 307
  3. ^ Francillon 1979, pp. 192–193.
  4. ^ Francillon, René J. (1988). McDonnell Douglas aircraft since 1920 : Volume I. London: Naval Institute Press. pp. 184–193. ISBN 0870214284.


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

External links

30th Bombardment Squadron

See United States Air Force Thunderbirds for the squadron's successor unitThe 30th Bombardment Squadron is a United States Air Force unit. On 19 September 1985 it was consolidated with the USAF Air Demonstration Squadron, also known as the United States Air Force Thunderbirds. The squadron was first activated in 1917 when the United States entered World War I as the 30th Aero Squadron. It deployed to France in the fall of 1917 and served as a construction unit throughout the war, returning to the United States at the end of 1918 for demobilization. It was reconstituted as the 30th Bombardment Squadron in March 1923 and served with reserve personnel during the decade. In 1932, the squadron became a regular unit, serving at bases in California.

The squadron, which had equipped with early models of the Boeing B-17 Flying Fortress, deployed to the Philippines in the fall of 1941 to reinforce the American garrison there. The squadron's base at Clark Field was attacked on 8 December 1941. During the month of December, the squadron withdrew through the Philippines to Darwin, Australia, although it continued to stage through Philippine bases through the spring of 1942. In late 1942, the squadron was withdrawn from combat and reformed as an Operational Training Unit. In April 1944, the squadron began training with Boeing B-29 Superfortresses and deployed again to the Pacific, where it participated in the strategic bombing campaign against Japan until the end of the war.

Following V-J Day, the squadron remained on Guam until the outbreak of the Korean War, when it moved to Okinawa to reinforce the bomber forces of Far East Air Forces. In 1954, after the armistice that ended hostilities in Korea, the squadron returned to the United States, where it became an element of Strategic Air Command (SAC), flying Boeing B-47 Stratojets, then Boeing B-52 Stratofortresses. When SAC dispersed its B-52 force to reduce vulnerability to Soviet missile attack, the squadron moved to Grand Forks Air Force Base, North Dakota as part of the 4133d Strategic Wing. It was inactivated on 1 February 1963, when SAC discontinued its MAJCON combat wings and their subordinate units and replaced them with wings that could continue their histories.

911th Air Refueling Squadron

The 911th Air Refueling Squadron is part of the 916th Air Refueling Wing at Seymour Johnson AFB, North Carolina. The squadron is the Air Force’s very first active duty squadron that is under the command of a reserve wing. In October of 2016, the 911th, formerly geographically separated from the 6th Air Mobility Wing at MacDill AFB, FL and operated as the active duty associate to the 916th Air Refueling Wing, became the first “I-Wing” or Integrated Wing.

The squadron is one of the oldest in the United States Air Force. Its origins date to 15 May 1917, when it was organized at Kelly Field, Texas. The 21st Aero Squadron served in France as part of the 3d Aviation Instructional Center, American Expeditionary Forces, as a pilot training squadron during World War I.

The squadron was activated as the 21st Observation Squadron in 1923, but received few, if any, personnel before being disbanded in 1933. In 1935 a new 21st Observation Squadron was organized at Langley Field, Virginia. In 1939, it moved to Florida and began to fly Neutrality Patrol missions over the adjacent waters.

After the attack on Pearl Harbor it flew antisubmarine patrols in the Gulf of Mexico and off the Atlantic Coast. It then became a heavy bomber training unit until 1944. In 1944 it converted to Boeing B-29 Superfortresses and saw combat in the Pacific during World War II, where it was awarded a Distinguished Unit Citation for its actions during the strategic bombing campaign against Japan.

It became part of Strategic Air Command (SAC) during the Cold War, maintaining a portion of its strength on alert. It frequently deployed a portion of the unit to support SAC operations, including combat operations in Southeast Asia. Members of the squadron participated Operation Enduring Freedom and Operation Iraqi Freedom. In 1991 it transferred to Air Combat Command as the United States Air Force reassigned and combined units to maintain a single wing on each base. It continued to support contingency operations after transferring to Air Mobility Command until it was inactivated in 2007.

Today, the squadron operates the Boeing KC-135 Stratotanker aircraft conducting air refueling missions worldwide as an active component of the Air Force’s first Integrated Wing, flying the aircraft of the reserve 916th Air Refueling Wing.

Douglas Aircraft Company

The Douglas Aircraft Company was an American aerospace manufacturer based in Southern California. It was founded in 1921 by Donald Wills Douglas Sr. and later merged with McDonnell Aircraft in 1967 to form McDonnell Douglas, when it then operated as a division of McDonnell Douglas. McDonnell Douglas later merged with Boeing in 1997.

Douglas XP3D

The Douglas XP3D was a prototype American patrol flying boat of the 1930s. A twin-engined high-winged monoplane, the P3D was produced by the Douglas Aircraft Company to equip the US Navy's Patrol squadrons, but despite meeting the Navy's requirements, the rival Consolidated PBY was preferred owing to a lower price.

List of seaplanes and amphibious aircraft

The following is a list of seaplanes and amphibious aircraft, which includes floatplanes and flying boats, by country of origin.

Seaplanes are any aircraft that has the capability of landing on water while amphibious aircraft are equipped with wheels to alight on land, as well as being able to land on the water. Flying boats rely on the fuselage or hull for buoyancy, while floatplanes rely on external pontoons or floats. Some experimental aircraft used specially designed skis to skim across the water but did not always have a corresponding ability to float.

This list does not include ekranoplans, 'Wing-In-Ground-effect' (WIG), water-skimmers, wingships or similar vehicles reliant on ground effect.

Douglas military aircraft
Ground attack
Training aircraft
USAAS/USAAC/USAAF/USAF bomber designations, Army/Air Force and Tri-Service systems
Original sequences
Main sequence
Long-range Bomber
Tri-Service sequence
USAAC/USAAF observation aircraft
Observation Amphibian


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