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Vought O4U Corsair
The Vought O4U Corsair was the designation applied to two different experimental biplane scout-observation aircraft. Neither reached production or entered regular service.
==Design and development==
Ordered by the United States Navy in 1930 as the third type of "lightweight" observation aircraft designs, along with the Keystone XOK-1 and the Berliner-Joyce XOJ-1, both of which were built to BuAer Design No. 86,〔Johnson, E. R., "United States Naval Aviation, 1919-1941: Aircraft, Airships and Ships Between the Wars", McFarland and Company, Inc., Jefferson, North Carolina, 2011, Library of Congress control number 2011006978, ISBN 978-0-7864-4550-9, page 119.〕 the XO4U-1 was completed to a somewhat different specification.〔Johnson, E. R., "United States Naval Aviation, 1919-1941: Aircraft, Airships and Ships Between the Wars", McFarland and Company, Inc., Jefferson, North Carolina, 2011, Library of Congress control number 2011006978, ISBN 978-0-7864-4550-9, page 120.〕
The Vought XO4U-1, BuNo ''A-8641'',〔http://www.history.navy.mil/avh-1910/APP09.PDF〕〔http://www.joebaugher.com/navy_serials/firstseries2.html〕 was built in 1931, and was Vought's first airplane with a deep monocoque two-place fuselage,〔Larkins, William T., "U.S. Navy Aircraft 1921-1941", Orion Books, New York, 1988, Library of Congress card no. 88-17753, ISBN 0-517-56920-5, p. 105.〕 and had a metal and fabric-covered metal wing structure.〔Johnson, E. R., "United States Naval Aviation, 1919-1941: Aircraft, Airships and Ships Between the Wars", McFarland and Company, Inc., Jefferson, North Carolina, 2011, Library of Congress control number 2011006978, ISBN 978-0-7864-4550-9, page 120.〕 Both sets of wings joined the fuselage ahead of the pair of cockpits with the pilot seated in a cut out on the trailing edge of the shoulder-mounted slightly-swept upper wing. Photos show the airframe in the factory, fitted with teardrop-shaped wheel pants, but exterior pictures taken during its brief existence do not show these installed. Powered by a Pratt & Whitney R-1340D Wasp 9-cylinder air-cooled radial engine driving a two-bladed fixed-pitch propeller. Although designed to serve either as a landplane or on floats, floats had not been fitted before the prototype was destroyed.
After the crash of the XO4U-1, Vought produced a new airframe which was designated the XO4U-2, and assigned the same serial carried by the XO4U-1, ''A-8641'', although several lists of U.S. Navy aircraft serials make no mention of the second design, or the reuse of the Bureau of Aeronautics number. (The same practice was applied to the three Grumman XF3F-1 prototypes, two of which crashed, with all three carrying the same serial number.) This was actually an O3U-3 Corsair featuring that model's rounded fin and rudder, an all-metal wing structure,〔Johnson, E. R., "United States Naval Aviation, 1919-1941: Aircraft, Airships and Ships Between the Wars", McFarland and Company, Inc., Jefferson, North Carolina, 2011, Library of Congress control number 2011006978, ISBN 978-0-7864-4550-9, page 117.〕 and was fitted with a cowled Pratt & Whitney R-1535 Twin Wasp Junior, and first flew in June 1932.〔Johnson, E. R., "United States Naval Aviation, 1919-1941: Aircraft, Airships and Ships Between the Wars", McFarland and Company, Inc., Jefferson, North Carolina, 2011, Library of Congress control number 2011006978, ISBN 978-0-7864-4550-9, page 120.〕 Aviation historian William T. Larkins observes that under the designation system the XO4U-2 should have been a minor modification of the XO4U-1.〔Larkins, William T., "U.S. Navy Aircraft 1921-1941", Orion Books, New York, 1988, Library of Congress card no. 88-17753, ISBN 0-517-56920-5, p. 122.〕
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