Military Wiki
Keystone NK
Role Biplane trainer
National origin United States
Manufacturer Keystone Aircraft
First flight 1928
Introduction 1930
Primary user United States Navy
Number built 20

The Keystone NK or Keystone Pup was a two-seat biplane trainer built by Keystone Aircraft for the United States Navy.

Design and development

The NK was an open-cockpit two-seat biplane with a convertible wheel or float landing gear. It was powered by a 220 hp (164 kW) Wright R-790 Whirlwind. The company prototype designated the Pup was entered into a United States Navy design competition for a trainer and was awarded a contract for three prototypes designated XNK-1. Following evaluation a production batch of 16 was ordered designated NK-1 which were delivered during 1930.


Keystone prototype, one built.
Prototypes for Naval variant of Pup, three built.
Production aircraft with minor changes, 16 built.


United States

Specifications (NK-1)

General characteristics

  • Crew: 2
  • Length: 26 ft 6 in (8.08 m)
  • Wingspan: 37 ft 0 in (11.28 m)
  • Powerplant: 1 × Wright R-790 Whirlwind, 220 hp (164 kW)


  • Maximum speed: 116 mph (186 km/h)
  • Range: 375 miles (603 km)


  • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. 
  • The Illustrated Encyclopedia of Aircraft (Part Work 1982-1985). Orbis Publishing. 
  • Andrade, John (1979). U.S.Military Aircraft Designations and Serials since 1909. Midland Counties Publications. ISBN 0-904597-22-9. 

External links

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