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 undercarriage 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 undercarriage 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.
Span: 39 ft 6.8 in (12,06 m)
Length: 24 ft 5.5 in (7,45 m)
Wing area: 197.20 sq.ft (18.32 sq.m)
Loaded weight: 5,393 lb (2,446 kg)
Max speed: 234 mph (376 kmh) at sea level)
276 mph (445 kmh) at 16,730 ft (5,100 m)
Climb: to 6,560 ft (2,000 m) 2 min 33 sec."