XP-22 Hawk

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XP-22 Hawk

Type	Experimental biplane fighter
Manufacturer	Curtiss Aeroplane and Motor Company
Primary user	United States Army Air Force
Number built	1

The Curtiss XP-22 Hawk was an 1930s American experimental biplane fighter built by Curtiss for evaluation by the United States Army Air Service.

1 Development
2 Operators
3 Specifications
4 Notes
5 References

[edit] Development

In 1929, the AAC ordered three P-11 Hawks for testing of the 600 hp (447 kW) Curtiss H-1640 Chieftain engine. This engine proved a failure, and before completion, one of the three was converted to use a 9-cylinder 575 hp Cyclone, being completed as the YP-20. Testing with the R1820 was prolonged, so the Army acquired another of the three P-11s, instead. This became the XP-22.

A number of changes were made for installing the 700 hp (520 kW) Curtiss V-1570 Conqueror engine. The radiator was relocated, a new cowl was fitted, and the tail was given more fin and less rudder area,^[1] and featured a steerable tailwheel, rather than the original skid.^[2] For these changes, Curtiss charged only US$1.

During testing, the XP-22 underwent a number of alterations and improvements, including a change from a three-strut landing gear to a single streamlined strut, later fitted with wheel pants; fillets were added where struts joined the wing; and the tail was briefly reduced in area, to P-6 standard. The XP-22 was also the Army's first fighter capable of 200 mph (320 km/h), achieving 202 mph (325 km/h).^[3]

In June 1931, the AAC held a competition to evaluate the P-6, P-12, YP-20, and XP-22. The XP-22 came out the winner, earning a contract for 45 aircraft as the Y1P-22. Following the trials, the XP-22 donated a nose and landing gear graft to the YP-20, which became the XP-6E, and the 45 production aircraft were completed to this standard.

[edit] Operators

United States

United States Army Air Force

[edit] Specifications

Data from U.S.Fighters, Lloyd Jones, Aero Publishers, 1975.

General characteristics

Crew: one pilot
Length: 23 ft 7 in (7.2 m)
Wingspan: 31 ft 6 in (9.6 m)
Height: 8 ft 10 in (2.7 m)
Wing area: 252 ft² (23.41 m²)
Empty weight: 2,597lb (1178 kg)
Max takeoff weight: 3,354 lb (1521 kg)
Powerplant: 1× V-1570 Conqueror water-cooled 12-cylinder vee engine, 575 hp ()

Performance

Maximum speed: 176 knots (202 mph (325 km/h))
Service ceiling 26,500 ft (8,077 m)

[edit] Notes

^ Fitzsimons, Bernard, ed. Illustrated Encyclopedia of Weapons and Warfare (London: Phoebus, 1978), Volume 12, p.1255.
^ Fitzsimons, p.1255.
^ Jones, p.58.

[edit] References

Fitzsimons, Bernard, ed. Illustrated Encyclopedia of Weapons and Warfare. Volume 12, pp.1255-6, "Hawk, Curtiss Models 34 and 35 P-1 to P-6 and F6C". London: Phoebus Publishing, 1978.
Donald, David, ed. Encyclopedia of World Aircraft. Etobicoke, ON: Prospero Books, 1997.
Jones, Lloyd S. U.S. Fighters. Fallbrook, CA: Aero Publishers, 1975.

v • d • e USAAS/USAAC/USAAF/USAF fighter designations 1924–1962

Pursuit (pre-1948) Fighter (post-1948)	P-1 • P-2 • P-3 • XP-4 • P-5 • P-6 • XP-7 • XP-8 • XP-9 • XP-10 • P-11 • P-12 • XP-13 • XP-14 • XP-15 • P-16 • XP-17 • XP-18 • XP-19 • YP-20 • XP-21 • XP-22 • XP-23 • YP-24 • Y1P-25 • P-26 • YP-27 • Y1P-28 • P-29 • P-30 • XP-31 • XP-32 • XP-33 • XP-34 • P-35 • P-36 • XP-37 • P-38 • P-39 • P-40 • XP-41 • XP-42 • P-43 • P-44 • XP-45 • XP-46 • P-47 • XP-48 • XP-49 • XP-50 • P-51 • XP-52 • XP-53 • XP-54 • XP-55 • XP-56 • XP-57 • XP-58 • P-59 • YP-60 • P-61 • XP-62 • P-63 • P-64 • XP-65 • P-66 • XP-67 • XP-68 • XP-69 • P-70 • XP-71 • XP-72 • XP-73 • (P-74 not assigned) • P-75 • XP-76 • XP-77 • XP-78 • XP-79 • P-80 • XP-81 • P-82 • XP-83 • P-84 • XP-85 • P-86 • XP-87 • XP-88 • P-89 • XF-90 • XF-91 • XF-92 • YF-93 • F-94 • YF-95 • YF-96 • F-97 • XF-98 • F-99 • F-100 • F-101 • F-102 • XF-103 • F-104 • F-105 • F-106 • F-107 • XF-108 • XF-109 • F-110 • F-111

Pursuit, Biplace	PB-1 • PB-2 • XPB-3

Fighter, Multiplace	YFM-1 • XFM-2

See also	Post-1962 list

v • d • e Aircraft produced by Curtiss

Manufacturer designations	No. 1 • No. 2 Model: C • D • E • F • G • H • J • K • L • M • N • JN • R Model: 1 • 2 • 3 • 5 • 6 • 7 • 8 • 10 • 11 • 12 • 13 • 14 • 17 • 18 • 19 • 20 • 23 • 26 • 31 • 32 • 33 • 34 • 35 • 36 • 37 • 38 • 40 • 41 • 42 • 43 • 44 • 47 • 48 • 49 • 50 • 51 • 52 • 53 • 54 • 55 • 56 • 57 • 58 • 59A/59B • 60 • 61 • 63 • 64 • 66 • 67 • 68 • 71 • 72 • 73 • 75 • 76 • 77 • 79 • 81 • 82 • 84 • 85 • 86 • 87 • 88 • 90 • 95 • 96 • 97 • 98 • 99

By role	Experimental: No. 1 • Model C • Tanager Racing: No. 2 • CR • R2C • R3C General utility: Model D • Model E • Model F • Robin • Thrush Maritime patrol: Model H • HS-1L and -2L Training: Model L • Model JN • AT-4 Hawk • AT-5 Hawk Naval Training: NC • N2C Fighters: 18 • PW-8 Hawk • P-1 Hawk • P-2 Hawk • P-3 Hawk • P-4 Hawk • P-5 Hawk • P-6 Hawk • XP-31 • P-36 Hawk • P-40 • XP-46 • XP-53 • YP-60 Naval Fighters: FC • F2C • F3C • F4C • F6C • F7C • F8C • F9C • F10C • F11C • XF12C • F13C • XF14C • F15C Airliners: Eagle • Kingbird Naval Scouts/Dive Bombers: CS • S2C • XS3C • S4C • SC • SBC • SB2C • XSB3C • SOC • SO2C • SO3C Observation: O-1 Falcon • O-12 Falcon • O-13 Falcon • O-16 Falcon • O-18 Falcon • O-26 Falcon • O-39 Falcon • O-52 Owl Naval Observation: OC • O2C • O3C Bombers: B-2 Condor Naval Bombers: BFC • BF2C • BTC • BT2C Ground Attack: A-3 Falcon • A-4 Falcon • A-5 Falcon • A-6 Falcon • A-8 Shrike • YA-10 Shrike • A-12 Shrike • YA-14 Licensed production: NBS-1

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