Dewoitine D 513
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The D 513 as first flown, with circular radiator and semi-elliptical tailplane

Two prototypes of a new fighter, the D 513, were ordered in 1935 as part of the 1934 C1 programme, the first of these being flown on 6 January 1936. Featuring semi-elliptical horizontal and vertical surfaces, with a wing of relatively high aspect ratio, an Hispano-Suiza 12Ycrsl engine with a frontal radiator similar to that of the D 503, and inward-retracting main undercarriage members, the D 513 proved disappointing during initial trials. It suffered serious instability and attained a maximum speed of only 425km/h at 4600m. Radical redesign followed, the wing and tailplane being mated to an entirely new fuselage, vertical tail surfaces, elevators and undercarriage, the frontal radiator giving place to a deep radiator bath beneath the nose. In this definitive form, the D 513 still proved incapable of meeting specified performance, a shortcoming which, compounded by continuing instability and difficulties with both engine cooling and undercarriage retraction, led to the discontinuation of development. The second prototype was fitted with an HS 12Ydrs2 engine rated at 930hp at 990m, and undercarriage and radiator a la D 503, and was employed for high-speed parachute launching trials as the D 514 LP.

In this much-modified definitive form the D 513 still proved unsatisfactoryA three-view drawing of In this much-modified definitive form the D 513 still proved unsatisfactory (800 x 507)

 MODELD 513 in its definitive form
    Take-off weight2446 kg5393 lb
    Wingspan12.06 m40 ft 7 in
    Length7.45 m24 ft 5 in
    Wing area18.32 m2197.19 sq ft
    Max. speed445 km/h277 mph

The D 513 after radical redesign and subsequent reconstruction

In this much-modified definitive form the D 513 still proved unsatisfactory.

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