The Full Wiki

More info on Boeing NB

Boeing NB: Wikis


Note: Many of our articles have direct quotes from sources you can cite, within the Wikipedia article! This article doesn't yet, but we're working on it! See more info or our list of citable articles.


From Wikipedia, the free encyclopedia

Boeing NB-1 floatplane
Role Military trainer
Manufacturer Boeing
First flight 1924
Number built ca. 72

The Boeing NB (or Model 21) was a primary training aircraft developed for the United States Navy in 1924. 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.

The NBs were produced in two batches; the first (NB-1) were powered by radial engines and the second by war-surplus Vee-8s still in the Navy's inventory. The original prototype evaluated by the Navy had been assessed as being too easy to fly, and therefore of limited use as a trainer. In particular, it was noted that the aircraft was impossible to spin. The NB-1 design attempted to introduce some instability, but it was soon discovered that while it was now possible to get the aircraft into a spin, it was virtually impossible to recover from one. A series of modifications were made to attempt a compromise.


  • VNB-1 - prototype (1 built)
  • NB-1 - original production machine with Lawrance J-1 radial engine (41 built)
  • NB-2 - production machine with Wright-Hispano E engine (30 built)
  • NB-3 - one NB-1 with lengthened fuselage and modified empennage to improve handling, and 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


 United States

Specifications (NB-1)

General characteristics

  • Crew: two, pilot and instructor
  • 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 ft² (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)


  • Maximum speed: 100 mph (160 km/h)
  • Range: 300 miles (480 km)
  • Service ceiling: 10.200 ft (3,110 m)
  • Rate of climb: 510 ft/min (2.6 m/s)


  • 1 × trainable rearward-firing .30 machine gun (optional, for gunnery training)


  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. pp. 170.  
  • World Aircraft Information Files. London: Bright Star Publishing. pp. File 890 Sheet 51.  

See also



Got something to say? Make a comment.
Your name
Your email address