Curtiss XP-46

A United States Army Air Corps (USAAC) specification based upon a Curtiss proposal was the basis for an order placed in September 1939 for the XP-46. The requirements called for a single-engine, low-wing aircraft, slightly smaller than the P-40, and with a wide-track, inward-retracting landing gear. The selected powerplant was a 1,150 hp (858 kW) Allison V-1710-39 V-12 engine. The planned armament included two .50 in (12.7 mm) synchronized machine guns in the forward fuselage and provisions for eight .30 in (7.62 mm) wing-mounted guns. The USAAC later added requirements for self-sealing fuel tanks and 65 lb (29 kg) of armor, the weights of which adversely affected performance.

In 1940 the British Purchasing Commission placed an order for the P-46 as a replacement for the P-40,Engel, Leonard. [http://www.flightglobal.com/pdfarchive/view/1940/1940%20-%203438.html "Half of Everything: An American's Survey of Orders Placed in the United States."] Flight, 5 December 1940, p. 472. the British service name 'Kittyhawk' was allocated by the Air Ministry in anticipation of receiving the aircraft.{{Cite magazine |url=https://www.flightglobal.com/pdfarchive/view/1941/1941%20-%201120.html |magazine=Flight |title=The American Fighters |date=15 May 1941|access-date=2016-06-03 |archive-date=2016-08-04 |page= |archive-url=https://web.archive.org/web/20160804200137/https://www.flightglobal.com/pdfarchive/view/1941/1941%20-%201120.html |url-status=dead }}

However, the USAAC asked Curtiss in July 1940 – while the XP-46 prototypes were under construction – to prioritize an upgraded P-40, featuring the engine intended for the XP-46. This would also avoid disruptions to the production line caused by any switch to a new airframe. The British order for the P-46 was later cancelled, and the 'Kittyhawk' name subsequently applied to the upgraded P-40.

Two prototypes, designated XP-46A, were nevertheless delivered to the USAAC; the first flight occurred on 15 February 1941. The type's performance during trials was found to be inferior to the then-contemporary P-40D. As the P-46 offered no significant improvement on the P-40, the program was cancelled.Berliner 2011, p. 18.

A myth claims that work on the XP-46 was the basis of the North American NA-73X – the prototype P-51 Mustang. While North American Aviation (NAA) purchased technical aerodynamic data on the P-40 and XP-46 from Curtiss for $56,000, and there are certain design similarities in the radiator/oil-cooler configuration of the two types, North American had already made significant progress on its design.Baugher, Joe. [http://www.joebaugher.com/usaf_fighters/p51_1.html "North American NA-73."] USAAC/USAAF/USAF Fighter and Pursuit Aircraft, 29 August 1999. Retrieved: 10 August 2010.{{efn|The British Air Ministry insisted NAA purchase the Curtiss data as in 1940 the former company had no experience of high speed flight, its previous fastest design being the Harvard trainer. The data was insisted upon so that NAA had aerodynamic data at high subsonic Mach numbers of an existing high speed fighter as guidance during the design of the NA-73.{{cn|date=July 2017}} }}

File:Curtiss XP-46 side view.jpg

{{Aircraft specs

|ref=Curtiss Aircraft 1907–1947{{cite book |last1=Bowers |first1=Peter M. |title=Curtiss aircraft, 1907-1947 |date=1979 |publisher=Putnam |location=London |isbn=0370100298 |pages=435–436}}

|prime units?=imp

|crew=1

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|height in=1

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|wing area sqft=208

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|airfoil=root: NACA 23016.5; tip: NACA 23009{{cite web |last1=Lednicer |first1=David |title=The Incomplete Guide to Airfoil Usage |url=https://m-selig.ae.illinois.edu/ads/aircraft.html |website=m-selig.ae.illinois.edu |access-date=16 April 2019}}

|empty weight lb=5625

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|gross weight lb=7665

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|eng1 number=1

|eng1 name=Allison V-1710-39

|eng1 type=V-12 liquid-cooled piston engine

|eng1 hp=1150

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|prop name=constant-speed propeller

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|max speed note=at {{cvt|12200|ft}}

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|range miles=325

|range note=

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• 2 × {{cvt|0.50|in}} synchronized machine guns in the forward fuselage
• Provision for 8 × {{cvt|0.30|in}} wing-mounted guns

|avionics=

}}

• Curtiss P-40
• Curtiss XP-42 - an earlier design also intended to replace the P-40, but not put into production
• North American P-51 Mustang
• Curtiss P-60 – a series of designs developed from the XP-46

{{notelist}}

{{Reflist|30em}}

{{Refbegin}}

• Berliner, Don. Surviving Fighter Aircraft of World War Two: Fighters. London: Pen & Sword Aviation, 2011. {{ISBN|978-1-8488-4265-6}}.
• Bowers, Peter M. Curtiss Aircraft, 1907-1947. London: Putnam & Company Ltd., 1979. {{ISBN|0-370-10029-8}}.
• Green, William. War Planes of the Second World War, Volume Four: Fighters. London: MacDonald & Co. (Publishers) Ltd., 1961 (Sixth impression 1969). {{ISBN|0-356-01448-7}}.
• Green, William and Gordon Swanborough. WW2 Aircraft Fact Files: US Army Air Force Fighters, Part 1. London: Macdonald and Jane's Publishers Ltd., 1977. {{ISBN|0-356-08218-0}}.

{{Refend}}

{{commons category|Curtiss XP-46}}

• [http://www.joebaugher.com/usaf_fighters/p46.html Curtiss XP-46]

{{P-40 Warhawk family}}

{{USAF fighters}}

{{Curtiss aircraft}}

Curtiss P-46

P-46

Category:Single-engined tractor aircraft

Category:Low-wing aircraft

Category:Aircraft first flown in 1941

Category:Aircraft with retractable conventional landing gear

Category:Single-engined piston aircraft