| YP-20 | |
|---|---|
 | |
| Parked YP-20 | |
| Role | Biplane fighter |
| Manufacturer | Curtiss Aeroplane and Motor Company |
| Primary user | United States Army Air Service |
| Number built | 1 |
The Curtiss YP-20 was an American biplane fighter project developed by Curtiss for the United States Army Air Service.
In 1929, three Curtiss P-11 Hawks were ordered with 600 hp (447 kW) Curtiss H-1640 Chieftain engines. These proved a failure, and before completion, the third was converted to use a 9-cylinder 575 hp (429 kW) Wright Cyclone, being completed as the YP-20. Testing with the R1820 was prolonged, so the Army's intention to promptly switch to a Curtiss V-1570 Conqueror engine and redesignate the aircraft XP-22 was dropped; another P-11 was chosen for that instead.
Except for the engine change and its Townend ring cowling, the YP-20 was not drastically different from the P-6 from which both it and the P-11 derived, though the YP-20 had more fin and less rudder area, [1] and featured a steerable tailwheel, rather than the original skid. [2] Later, a crankcase cover, gear strut fairings, and wheel pants were added.
In June 1931, the AAC held a competition to evaluate the P-6, P-12, XP-22, and YP-20. The XP-22 came out the winner, but the YP-20 was given a nose and landing gear graft from the XP-22, becoming the XP-6E (P-6E prototype). With the addition of a supercharger and an enclosed cockpit, it was tested as the XP-6F.
United States Data from Curtiss Aircraft 1907–1947 [3]
General characteristics
Performance
Armament
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