|National origin||United States|
|Primary user||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.
- 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.
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