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/ Boeing NB
Boeing NB
The Boeing NB/Model 21 was a primary training aircraft developed for the United States Navy in 1923.
It was a two-bay, equal-span biplane of conventional configuration with interchangeable wheeled and float undercarriage.
The pilot and instructor sat in tandem open cockpits.
Variants
VNB-1
Prototype
NB-1
Original production machine with Lawrance J-1 radial engine
NB-2
Production machine with Wright-Hispano E engine
NB-3
One NB-1 with lengthened fuselage and modified empennage to improve handling, it was also fitted with a Hispano-Suiza E engine.
Later refitted to standard NB-1
NB-4
One NB-1 converted similar to NB-3, but with Lawrance J-1 engine.
Later refitted to standard NB-1
Specifications
Crew
two
Length
28 ft 9 in (8.76 m)
Wingspan
36 ft 10 in (11.23 m)
Height
11 ft 8 in (3.56 m)
Wing area
344 sq ft (32.0 m2)
Empty weight
2,136 lb (969 kg)
Gross weight
2,837 lb (1,287 kg)
Powerplant
1 × Lawrance J-1 , 200 hp (149 kW)
Performance
Maximum speed
100 mph (160 km/h, 87 kn)
Range
300 mi (480 km, 260 nmi)
Service ceiling
10.200 ft (3,110 m)
Rate of climb
510 ft/min (2.6 m/s)
Armament
1 × trainable rearward firing .30 machine gun
(Optional, for gunnery training).
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