Keystone NK
Role	Biplane trainer Type of aircraft
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.

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

• United States Navy

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)

Performance

• Maximum speed: 116 mph (186 km/h, 101 kn)
• Range: 375 mi (603 km, 326 nmi)