the Vought OS2U Kingfisher is an American catapult launch floating monitor. The single-wing aircraft was compact, with a large central float and small buoys for stability. The performance was modest because of its low-power engine. OS2U can also operate on fixed, wheeled, and tail-drop gear drawers. Os 2U was the main surveillance seaplane on board the ship used by the U.S. Navy during World War II, and 1,519 aircraft were built. She served in U.S. Navy battleships and cruisers, with the U.S. Marine Corps in the 3rd Marine Scout Squadron (VMS-3), with the U.S. Coast Guard at coastal air stations, at sea with the Royal Navy Air Force Fleet, and with the Soviet Navy. The Royal Australian Air Force has also operated a small number of fishermen from the bases. OS2N was an OS2N aircraft label os2U-3 built by a naval aircraft factory in Philadelphia, Pennsylvania. The OS2U unit first flew on March 1, 1938. in the late 1930s, vought engineer Rex B. Beisel was commissioned with the design of a u.S. Navy monoplane control aircraft suitable for many tasks including guiding the fire of a warship. In replacing the standard dual-aircraft surveillance aircraft with a more modern monoplane design, Beisel incorporated innovations making it the first production type to be assembled with spot welding, a Vought process and a marine aircraft factory jointly developed to create a smooth air body that resists twisting and generated less clouds. Beisel has also introduced high-lifting devices, The spoilers are in a unique arrangement, the flaps of a perverted plate and drooping ellerons are deployed located on the excess edge of the wing to increase the cam of the wing thus creating an additional elevator. For combat missions, the pilot had a 0.30 Browning M1919 machine gun, the receiver was low in the right front cockpit, and fired between the engine cylinder heads, while the radio/gunoperator milked another 30-gauge machine gun (or pair) on mount Ring Scarf flexible. The aircraft can also carry two 100-pound bombs or two charges a depth of 325 pounds. In addition, Kingfisher has also worked as a trainer in both its seaplane and land-based aircraft formations.