Boeing Model 21 (NB)

1st Flight 1923

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).

……………………………………………………………………………………………………………………………………………………………………………………………………………………………..

Share on facebook

Share on facebook