Vought XSO2U

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XSO2U-1
Role Observation floatplane
National origin United States
Manufacturer
Vought-Sikorsky
First flight July 1939
Retired July 1944
Primary user United States Navy
Number built 1
Developed from
OS2U Kingfisher

The Vought XSO2U was an American observation

Curtiss SO3C
in evaluation, but failed to win a production contract due to Vought's lack of manufacturing capacity.

Design and development

In the late 1930s the United States Navy developed a set of specifications for a new scout-observation aircraft to operate from its

Curtiss SOC biplane, the requirements included that the aircraft should have folding wings, have a superior range and speed to that of the SOC, and that the new type should be powered by the Ranger V-770 inline engine.[1]

Designs were submitted in response to the Navy's specifications by

Vought-Sikorsky and Curtiss-Wright. The Vought design, designated Model 403 by the company, was similar to the company's OS2U Kingfisher, which was then under development to replace the SOC aboard U.S. Navy battleships, but had its monoplane wing moved higher on the fuselage than that of the Kingfisher, and differed in the attachment method used by its single-float landing gear.[1] In addition, the radial engine of the OS2U was replaced by an inline Ranger V-770 in a squared-off cowling.[2]

Capable of being operated with either the float as a seaplane or with a conventional

taildragger undercarriage as a landplane, the XSO2U utilised all-metal construction, with the exception of its control surfaces which were fabric-covered. The wings folded to the rear for storage in a manner similar to that of the Grumman TBF Avenger torpedo bomber, .[1]

The aircraft was capable of performing

M2 Browning machine guns, one mounted in a fixed position firing forwards through the propeller using synchronizer gear, while the other was in a flexible position in the observer's cockpit for rear defense.[1]

Operational history

Assigned the

ventral fin, connecting the rear of the float to the tail, helped to cure the problem.[1]

The aircraft also suffered from engine problems, however, that were not so easily cured; the Ranger engine was well known for unreliability, and was particularly prone to overheating problems that were never satisfactorily solved. The aircraft's original XV-770-4 engine was replaced by a XV-770-6, with a repositioned oil cooler, during flight testing; despite this, the problems continued.[1]

Despite the engine issues, the SO2U-1 was considered overall to be superior to the competing

F4U Corsair fighter. As a result, the XSO3C was declared the winner of the contract, and was ordered into production.[4] Named Seagull by the U.S. Navy, and Seamew by the Royal Navy, the SO3C developed a disastrous reputation in service,[1] and was retired before the SOC biplane which it was intended to replace.[5]

Following the end of the

Edo XOSE floatplane, but the V-770 remained troublesome, and after two years of testing the XSO2U was returned to the Navy. Having no further use for the aircraft, the XSO2U-1 was removed from the Navy's rolls on 6 July 1944, being subsequently scrapped.[1]

Operators

 United States

Specifications (XSO2U-1)

The XSO2U-1 on wheeled landing gear

Data from OS2U Kingfisher in action[1]

General characteristics

  • Crew: 2 (pilot and observer)
  • Length: 36 ft 1 in (11.00 m)
  • Wingspan: 38 ft 2 in (11.63 m)
  • Height: 15 ft 11 in (4.85 m)
  • Wing area: 300 sq ft (28 m2)
  • Empty weight: 4,016 lb (1,822 kg)
  • Max takeoff weight: 5,624 lb (2,551 kg)
  • Fuel capacity: 128 US gallons (480 L; 107 imp gal)
  • Powerplant: 1 ×
    inline engine
    , 450 hp (340 kW)
  • Propellers: 2-bladed Hamilton Standard constant-speed

Performance

  • Maximum speed: 190 mph (310 km/h, 170 kn) at 9,000 feet (2,700 m)
  • Service ceiling: 22,200 ft (6,800 m)

Armament

  • Guns: 2 x
    M2 Browning machine guns
    , one fixed forwards-firing, one flexible rear-firing.
  • Bombs: Two light bombs or depth charges on underwing racks.

See also

Aircraft of comparable role, configuration, and era

Related lists

References

Citations

  1. ^ a b c d e f g h i Adcock 1991, p.44.
  2. ^ Green 1967, p.162.
  3. ^ Baugher 2010
  4. ^ Bowers 1979, p.419.
  5. ^ Polmar 2004, p.117.

Bibliography

  • Adcock, Al (1991). OS2U Kingfisher in action. Aircraft In Action. Vol. 119. Carrollton, TX: Squadron/Signal Publications.
    ISBN 0-89747-270-5
    .
  • Baugher, Joe (September 18, 2010). "US Navy and US Marine Corps BuNos, Second Series (0001 to 5029)". US Navy and US Marine Corps Aircraft Serial Numbers and Bureau Numbers--1911 to Present. Retrieved 2011-01-12.
  • Bowers, Peter M. (1979). Curtiss Aircraft, 1907-1947. New York: Putnam.
    ISBN 978-0-370-10029-6
    .
  • ASIN B0000CLL8R
    .
  • Polmar, Norman (2004). Historic Naval Aircraft: from the pages of Naval History Magazine. Dulles, VA: Brassey's Inc.
    ISBN 1-57488-572-3
    .

External links

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