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Curtiss P-40E (Kittyhawk Mk.IA) in the markings of No. 3 Squadron RAAF, which was part of the Desert Air Force.
By Chris Finney - Gallery page http://www.airliners.net/photo/Curtiss-Kittyhawk-Mk1A/1096502/LPhoto http://cdn-www.airliners.net/aviation-photos/photos/2/0/5/1096502.jpg, GFDL 1.2, Link
The Curtiss P-40 Warhawk was the third most built American fighter, with 15,000 units produced.
The P-40E, armed with six 0.5inch wing machine guns, was used extensively as a low-altitude close-support fighter. Numerous units were exported to the Allied air forces, among which, 1,500 units served the RAF as P-40E Kittyhawk Mk 1A. The British deployed the Kittyhawk in Northern Africa against the German Luftwaffe.
Starting with the 24th Model 87, an additional .50 MG was added to each wing and the carburetor intake was moved forward 6 in. Although these changes were relatively minor, this new variant was given the designation P-40E.
When the P-40D and E went into service, several problems were discovered. When maneuvering in high G turns the guns would often jam due to the way the ammunition was stored. Another problem was that engine and trim management were both somewhat complex and taxing with earlier P-40's required strong rudder pressure to offset engine torque and frequent trim adjustments were needed during rapid speed changes. Both these problems were remedied sometime late in production by enlarging the vertical stabilizer and changing how the ammunition was stored.