Keystone XOK
Keystone Aircraft · United States · first flew 1931 · reconnaissance aircraft
The Keystone XOK was an American biplane observation floatplane developed for the United States Navy in the early 1930s.
Recognition (WEFT)
| W — Wings | Mid-mounted, straight |
|---|---|
| E — Engines | 1 × piston, nose-mounted |
| F — Fuselage | 9.09 m fuselage |
| T — Tail | Conventional |
WEFT is AircraftIQ's four-point recognition method — how it works.
Spot it by:
- Biplane of mixed metal and fabric construction
- Pilot and observer in tandem open cockpits
- Single Wright R-975 radial engine; convertible between wheels and floats
A conventional two-seat biplane with a radial engine, readily convertible between wheels and floats.
Specifications
- The Keystone XOK has a length of 9.09 m (30 ft).
- It has a wingspan of 10.57 m (35 ft).
- Its maximum speed is 224 km/h (139 mph).
- Typical crew: 2.
Figures are for the representative variant described above; marks differ. See how AircraftIQ sources figures.
History
The Navy requirement of 1929 called for an observation aircraft for Omaha class cruisers, light enough for the cruiser catapult. Keystone-Loening, Berliner-Joyce and Vought each received a prototype order. The XOK-1 first flew on 5 January 1931.
Variants
Only one XOK-1 was built.
Where you'll see it
The prototype broke up in flight on 15 April 1931 after its cowling detached and struck the wings and tailplane. Development was dropped and the Berliner-Joyce entry was chosen for production.
Related aircraft
- Keystone PK-1
- Keystone K-47 Pathfinder
- Keystone LB-6
- Amiot 130
- Focke-Wulf Fw 47 Höhengeier
- Lublin R-XIII
- Martin P3M-2
AircraftIQ — the aircraft field guide: 5,226 recognition guides, live overhead identification, works offline.