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North American NA-21 / XB-21


Similar in appearance to the Douglas B-18 Bolo, but intended to achieve significantly improved performance, the North American NA-21 bomber was developed at the company's Inglewood, California plant during 1935-3, the prototype being completed in March 1937.

Powered by two 895kW Pratt & Whitney R-218.0 Twin Hornet engines with F-10 turbo-superchargers, the XB-21 carried a six-man crew and armament comprised single 7.62mm machine-guns in nose and dorsal turrets, plus a similar weapon in each of the ventral and two waist positions. Short-range bomb load was 4536kg, reducing to 998kg over 3058km.

Only the prototype was built which led to the NA-40 prototype, which led directly to the B-25.

Engines: 2 x Pratt & Whitney R 2180 Twin Hornet 1200 hp
Wingspan: 28,96m / 95 ft 0 in
Max weight: 18144 Kg / 40001 lb
Power loading: 7,560 Kg/hp
Max speed: 354 kph / 220 mph
Range: 3060 km
Armament: 3 x 7,62 mm mg
Bombload: 4535 kg


North American XB-21



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