The Keystone NK or Keystone Pup was a two-seat biplane trainer built by

Keystone Aircraft Keystone Aircraft Corporation was an early American airplane manufacturer. History Headquartered in Bristol, Pennsylvania, the company was formed as "Ogdensburg Aeroway Corp" in 1920 by Thomas Huff and Elliot Daland, but its name was quickly ...

for the

United States Navy The United States Navy (USN) is the maritime service branch of the United States Armed Forces and one of the eight uniformed services of the United States. It is the largest and most powerful navy in the world, with the estimated tonnage ...

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

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Specifications (NK-1)

References

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External links

Aerofiles
{{USN trainer aircraft NK 1920s United States military trainer aircraft Single-engined tractor aircraft Biplanes Floatplanes