Sukhoi Su-15 (1949)
|First flight||11 January 1949|
|Primary user||Soviet Air Force|
The Su-15 was an early attempt at an all-weather jet-powered interceptor. Its development was ordered by the Soviet government in March 1947, with the approval of the Sukhoi Design Bureau’s preliminary midwing design featuring a pressurized cabin, radar, swept wings and tandem engines, similar to that already attempted by the Lavochkin L-200 and Mikoyan-Gurevich I-320. Per TsAGI, the sweep of the wings was selected to be 35 degrees. The first prototype was completed on 25 October 1948 — only four months after production had started. The Su-15 first flew on 11 January 1949 piloted by Sukhoi test pilot G. M. Shiyanov. In testing, Su-15 reached 1032 km/h (557 knots, 641 mph; Mach 0.888) at 4,550 metres (14,930 ft) and 985 km/h (532 knots, 612 mph; Mach 0.926) at 10,950 metres (35,930 ft), but experienced excess vibration at speeds in excess of Mach 0.87. During 39th flight on 3 June 1949, the aircraft developed severe vibration, forcing the test pilot S.N. Anokhin to eject. The exact cause of the accident was never determined. At the time of the accident, 90% of the flight test program had been completed, over the course of 42 flights with a total flight time of 20 hours, 15 minutes. The program was subsequently terminated, and the second prototype was not completed.
The Su-15 was an all-metal mid-wing monoplane with a 35° swept wing. The aircraft had several very unusual design features. Its twin Klimov RD-45 engines were positioned in tandem rather than side-by-side, due to their large diameter. The front engine sat low with exhaust under the middle of the fuselage. The rear engine nozzle was at the tip of the aft fuselage. The cockpit had to be offset to the left to make room for the air intake ducting for the rear engine.
The wing had two spars with two wing fences ranging the entire chord, with hydraulically operated ailerons and Fowler flaps. The air intake was at the bow and was centrally divided by a central web. At the rear, two-start rockets were mounted and also two air brakes.
Specifications (Su-15) 
- Crew: 1
- Length: 15.44 m (50 ft 8 in)
- Wingspan: 12.87 m (42 ft 3 in)
- Height: ()
- Wing area: 36 m² (388 ft²)
- Empty weight: 7,409 kg (16,334 lb)
- Loaded weight: 10,437 kg (23,009 lb)
- Powerplant: 2 × Klimov RD-45F turbojet, 22.2 kN (5,000 lbf) each
- Maximum speed: 985 km/h (532 kn, 612 mph) (Mach 0.926) at 10,950 m (35,925 ft)
- Range: 1,050 km (565 nmi, 650 mi)
- Service ceiling: 15000 m (49,210 ft)
- Rate of climb: 2.5 min to 5,000 m (16,405 ft)
- Thrust/weight: 0.43
- 2 × 37 mm (1.45 in) Nudelman N-37 cannon, 110 rounds
- Toriy radar
See also 
- Aircraft of comparable role, configuration and era
- Antonov,Vladimir & Gordon, Yefim & others. OKB Sukhoi”. Leicester. Midland. 1996. ISBN 1-85780-012-5
- Shavrov V.B. (1994). Istoriia konstruktskii samoletov v SSSR, 1938-1950 gg. (3 izd.). Mashinostroenie. ISBN 5-217-00477-0.
- Green, W; Swanborough, G (2001). The Great Book of Fighters. MBI Publishing. ISBN 0-7603-1194-3.