Sukhoi Su-5

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 the German turbojet-powered Messerschmitt Me 262 near the end of WWII prompted the Soviet Union to develop faster fighter aircraft. Since the USSR lacked a production-ready turbojet engine, development 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.

General characteristics
Crew: 1
Length: 8.51 m 
Wingspan: 10.56 m 
Height: 3.53 m 
Wing area: 17 m² 
Empty weight: 2,954 kg 
Loaded weight: 3,804 kg 
Powerplant:
1 × VDRK motorjet, 2.9 kN 
1 × Klimov VK-107A liquid-cooled V12 engine, 1,230 kW (1,650 hp)
Maximum speed: 810 km/h (437 kn, 503 mph) projected at 7,800 m (25,590 ft)
Range: 600 km 
Service ceiling: 12,000 m 
Rate of climb: 5.7 min to 5,000 m 
Armament: 1 × 23 mm (0.91 in) Nudelman-Suranov NS-23 cannon

2 × 12.7 mm (0.50 in) Berezin UB machine guns