Northrop BT
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The Northrop BT was a two seat, single engine, monoplane, dive bomber built by the Northrop Corporation for the US Navy. At the time Northrop was a subsidiary of the Douglas Aircraft Company. The design of the initial version began in 1935. A 700 hp Pratt and Whitney XR-1535-66 Twin Wasp Jr. double row, radial air-cooled engine powered the aircraft. The aircraft had slotted flaps and a landing gear that partially retracted.
The next iteration of the BT, designated the XBT-1 was equipped with a 750 hp R-1535 engine. This aircraft was followed in 1936 by the BT-1 that was powered by an 825 hp Pratt and Whitney R-1535-94 engine. One of the BT-1 aircraft was modified with a fixed tricycle landing gear and was the first such aircraft to land on an aircraft carrier.
The next version, the XBT-2, was a BT-1 aircraft modified in 1939 by Douglas Aircraft Company to incorporate a fully retracting landing gear, wing slots, a re-designed canopy, and was powered by an 800 hp Wright XR-1820-32 radial air-cooled engine. The XBT-2 became the prototype for the Douglas SBD-1.
Specifications (BT-1)
General characteristics
- Crew: two: pilot, gunner
- Length: 9.5 m (31 ft 3 in)
- Wingspan: 12.7 m (41 ft 6 in)
- Height: 3.81 m (12.5 ft )
- Wing area: 29.63 m² (134.5 ft²)
- Empty: 2029 kg (4464 lb)
- Maximum takeoff: 3209 kg (7060 lb)
- Powerplant: one, Pratt and Whitney R-1535-94 Twin Wasp Jr. double row radial air-cooled engine, 615 kW (825 hp)
Performance
- Maximum speed: 357 km/h (222 mi/h)
- Cruise speed: 309 km/h ( 192 mi/h)
- Range: 1,850 km (2,979 miles)
- Service ceiling: 7,710 m (25,300 ft)
- Rate of climb: m/min (ft/min)
- Wing loading: kg/m² ( lb/ft²)
- Power/mass:
Armament
- one 12.7 mm machine gun
- one 7.62 mm machine gun
- 454 kg (1,000 lb) bombs on external wing racks
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