||6 April 1945
The Sukhoi Su-5 or I-107 was a Soviet mixed-power (propeller and motorjet) prototype fighter aircraft built toward the end of World War II.
The appearance of German turbojet-powered Messerschmitt Me 262 near the end of WWII prompted Soviet Union to develop faster fighter aircraft. Since USSR lacked a production-ready turbojet engine, the efforts were directed toward mixed-power aircraft utilizing a conventional piston engine-driven propeller for the majority of propulsion with a small rocket or jet engine for bursts of speed.
The Su-5 (initially I-107) and the conceptually similar Mikoyan-Gurevich I-250 were designed in 1944. The aircraft first flew on 6 April 1945 and underwent limited flight testing. It was subsequently fitted with a laminar flow wing and attained 793 km/h (428 kn, 493 mph) at 4,350 m (14,270 ft) with the motorjet functioning. On 15 June 1945, the Klimov VK-107A piston engine was damaged beyond repair in flight. Following acquisition of another VK-107A, flight testing continued until 18 October when the engine reached the end of its service life. No further VK-107As could be procured and the project was canceled.
The Su-5 was a conventional monoplane of all-metal construction. The VRDK (Russian: Воздушно-Реактивный Двигатель Компрессорный) motorjet in the rear of the fuselage was powered by a driveshaft from the VK-107 piston engine and could provide an additional 100 km/h (54 kn, 62 mph) of speed for three minutes.
Data from 
- Crew: 1
- Length: 8.51 m (27 ft 11 in)
- Wingspan: 10.56 m (34 ft 8 in)
- Height: 3.53 m (11 ft 7 in)
- Wing area: 17 m² (183 ft²)
- Empty weight: 2,954 kg (6,510 lb)
- Loaded weight: 3,804 kg (8,390 lb)
- Aircraft of comparable role, configuration and era
- ^ a b c Shavrov V.B. (1994). Istoriia konstruktskii samoletov v SSSR, 1938-1950 gg. (3 izd.). Mashinostroenie. ISBN 5-217-00477-0.
- ^ a b Green, W; Swanborough, G (2001). The Great Book of Fighters. MBI Publishing. ISBN 0-7603-1194-3.
- ^ "Sukhoi Su-5". Sukhoi Company Museum. Retrieved 2007-01-14.