“TheCeļotājs”
"Latvia" Former Soviet Union Military Bases
 
Soviet Union Sukhoi Su-15 Aircraft Interceptors' and Armament
 
Sukhoi Su-15 "1949"
 
The Sukhoi Su-15 "Aircraft P" was a prototype Soviet all-weather interceptor "which never reached production". The name was later reused for an entirely different 1960s interceptor. 
 
Development
 
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 meters "14,930 feet" and 985 km/h "532 knots, 612 mph; Mach 0.926" at 10,950 meters "35,930 feet", 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.
 
Operators
  • Soviet Air Force and some other countries
Sukhoi Su-15 "1949" Specifications
 
General Characteristics
  • Crew: 1
  • Length: 15.44m "50 feet 8 inches"
  • Wingspan: 12.87m "42 feet 3 inches"
  • Height: ()
  • Wing Area: 36m² "388 feet²"
  • Empty Weight: 7,409kg "16,334 pounds"
  • Loaded Weight: 10,437kg "23,009 pounds"
  • Power-plant: 2 × Klimov RD-45F turbojet, 22.2kN "5,000lbf" each
Performance
  • Maximum Speed: 985 km/h "532kn, 612 mph" "Mach 0.926" at 10,950m "35,925 feet"
  • Range: 1,050km "565nmi, 650 miles"
  • Service Ceiling: 15000m "49,210 feet"
  • Rate of Climb: 2.5min to 5,000m "16,405 feet"
  • Thrust/Weight: 0.43
Armament
  • 2 × 37mm "1.45 inches" Nudelman N-37 Cannon, 110 rounds
         
Nudelman N-37 37mm "1.45 inches" Cannon 110 rounds
Avionics
  • Toriy Radar 
The N-37 was a powerful, 37mm "1.46 inches" aircraft cannon used by the Soviet Union. It was designed by V. Ya. Nemenov of A.E. Nudelman's OKB-16 to replace the wartime Nudelman-Suranov NS-37, entering service in 1946. It was 30% lighter than its predecessor at the cost of a 23% lower muzzle velocity.
 
The N-37 was a sizable weapon firing a massive "735 g/26 oz HEI-T, 760 g/27 oz AP-T" shell. Its muzzle velocity was still considerable, but its rate of fire was only 400 rounds per minute. The weapon's considerable recoil and waste gases were problematic for turbojet fighter aircraft, as was finding space for the gun and a useful amount of ammunition, but a single shell was often sufficient to destroy a bomber.
 
The N-37 was used in the MiG-9, MiG-15, MiG-17, and early MiG-19 fighters, the Yakovlev Yak-25, and others. Production lasted through the late 1950s, although it remained in service for many years afterwards.
 
Variants
  • N-37 basic version without muzzle brake
  • N-37D N-37 with muzzle brake
  • N-37L N-37 with 1950mm long barrel "had no muzzle brake"
  • NN-37 improved N-37L developed during the late 1950s for the Yak-27 reconnaissance aircraft. The  NN-37 differed from the N-37L in having a pneumatic counter-recoil accelerator, therefore achieving a rate of fire of 600-700rpm. The ammunition feed mechanism was redesigned as well on this version.
37mm Single-Barrel Automatic Aircraft Cannon Specifications
 
    
 
 
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Revised: 01/29/2013 – 11:06:22