12/29/2014. Remarks by
Johan Visschedijk: "Two prototypes of a new fighter, the D.513, were ordered in 1935 as part of the 1934 C1 fighter program, the
first of these being flown on January 6, 1936. Featuring semi-elliptical horizontal and vertical surfaces, with a wing of relatively high aspect ratio, an Hispano-Suiza 12Ycrs1 engine with a frontal radiator similar to that of the D.503, and inward-retracting main landing gear members, the D.513 proved disappointing during initial trials. It suffered serious instability and attained a maximum speed of only 264 mph (425 kmh) at 15,090 ft (4,600 m). Radical redesign followed, the wing and tail plane being mated to an entirely new fuselage, vertical tail surfaces, elevators and landing gear, the frontal radiator giving place to a deep radiator bath beneath the nose.
In this definitive form (as shown above), the D 513 still proved incapable of meeting specified performance, a short-coming which, compounded by continuing instability and difficulties with both engine cooling and landing gear retraction, led to the discontinuation of development. The second prototype was fitted with an HS 12Ydrs2 engine rated at 930 hp at 3,250 ft (990 m), and landing gear and radiator as used on the D.503, and was employed for high-speed parachute launching trials as the D.514 LP. The following data relate to the D.513 in its definitive form."
