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North American NA-63 / XB-28

na-xb-28

 

Envisaged originally as a high-altitude version of the B-25 Mitchell, the North American NA-63 (XB-28) emerged finally as an almost entirely different aircraft. With single vertical tail surfaces and a circular-section fuselage with a pressure cabin for the five-man crew, the XB-28 was powered by two 1491kW Pratt & Whitney R-2800 radials and bomb bay capacity was 1814kg and -28A with R-2800-27. Dorsal, ventral and tail turrets, each containing two 12.7mm machine-guns, were remotely controlled from the cockpit; three similar forward-firing weapons were also fitted.
 
NA-B28-02
North American XB-28 40-3056
 
Of three prototypes ordered in February 1940, the first flew in April 1942 (40-3056), the second (40-3058), with a reconnaissance camera installation, crashed during the test programme and the third was cancelled. Although the XB-28 achieved a maximum speed of 599km/h at 7620m and could carry a 272kg bomb load for 3283km, production orders were not placed when no particular need for such a plane was found. A third prototype was unbuilt.
 
XB-28 / NA-63
Engines: two Pratt & Whitney R-2800-11, 11491kW / 2000 hp
Wingspan: 22.12 m / 72 ft 7 in
Length: 17.20 m / 56 ft 5 in
Wing area: 62.80 sq.m / 675.97 sq ft
Max take-off weight: 16226 kg / 35772 lb
Empty weight: 11611 kg / 25598 lb
Useful load: 10,165 lb
Max speed: 372 mph
Cruise speed: 411 km/h / 255 mph
Stall: 86 mph
Ceiling: 34,600 ft
Range: 3284 km / 2041 miles
 
XB-28A / NA-67
Engines: two Pratt & Whitney R-2800-27, 11491kW / 2000 hp
Wingspan: 22.12 m / 72 ft 7 in
Length: 17.20 m / 56 ft 5 in
Wing area: 62.80 sq.m / 675.97 sq ft

 

na-xb-28-ld

North American XB-28

 

 


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