Keystone XOK
{{Infobox aircraft
|name =XOK-1
|image =
|caption =
|type =Observation floatplane
|manufacturer =Keystone Aircraft
|designer =
|first_flight = January 1931
|introduction =
|retired =
|primary_user =United States Navy
|more_users =
|produced =
|number_built = 1
|unit cost =
|developed_from=
|variants =
|developed_into =
|sole example of type?= Y
|construction_number =
|military_serial = A8357
}}
The Keystone XOK was an American biplane observation floatplane developed for the United States Navy during the early 1930s.
Design and development
In 1929, the Navy issued requirements calling for an observation floatplane intended for service aboard Omaha class light cruisers, readily convertible to wheels or floats and light enough to operate from the cruiser-type catapult.{{cite book |last1=Johnson |first1=E.R. |title=United States Naval Aviation 1919-1941. Aircraft, Airships and Ships Between the Wars |url=https://archive.org/details/unitedstatesnava00john |url-access=limited |year=2011 |publisher=McFarland & Company, Inc. |location=Jefferson, North Carolina, and London |isbn=978-0-7864-4550-9|pages=[https://archive.org/details/unitedstatesnava00john/page/n124 118]}}
Prototypes were ordered from Keystone-Loening (then a subsidiary of Curtiss-Wright), Berliner-Joyce and Vought, and designated as the XOK-1, XOJ-1 and XO4U-1 respectively.
The Keystone design was a conventional biplane of mixed metal and fabric construction, with the pilot and observer seated in tandem in open cockpits. It made its first flight on January 5, 1931.
On April 15, 1931, during a demonstration before naval officials, the XOK-1 broke up in flight after the cowling detached itself and smashed into the wings and tailplane. With the Berliner-Joyce and Vought prototypes nearly ready for trials, the Bureau of Aeronautics elected to discontinue further development of the XOK-1. Eventually, the Berliner-Joyce's entry was selected for production.
Operators
;{{USA}}
Specifications (XOK-1)
{{Aircraft specs
|prime units?=imp
|crew=2 (pilot and observer)
|length m=
|length ft=29
|length in=10
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|span ft=34
|span in=8
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|wing area sqft=293
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|empty weight lb=2219
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|gross weight lb=3395
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|eng1 number=1
|eng1 name=Wright R-975
|eng1 type=radial engine
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|eng1 hp=400
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|max speed kmh=
|max speed mph=139
|max speed kts=
|max speed note=at sea level
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|range km=
|range miles=330
|range nmi=
|range note=estimated
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|ceiling m=
|ceiling ft=19900
|ceiling note=
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|guns=1× fixed, forward firing .30 in machine gun; 1× flexibly mounted .30 in machine gun in the rear cockpit
|bombs=
|avionics=
}}
See also
{{Portal|Aviation}}
{{Aircontent
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References
;Citations
{{reflist}}
External links
- [https://www.flickr.com/photos/sdasmarchives/24644618611/ Keystone XOK-1 photograph.]
{{Keystone aircraft}}
{{USN observation aircraft}}
Category:Single-engined tractor aircraft
Category:1930s United States military reconnaissance aircraft