Keystone NK
# Keystone NK

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)
