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.
Variants Pup Keystone prototype, one built. XNK-1 Prototypes for Naval variant of Pup, three built. NK-1 Production aircraft with minor changes, 16 built.
Operators
United States Navy
Specifications (NK-1)
References
External links
Aerofiles