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I-Z
Role Fighter
National origin Soviet Union
Manufacturer Grigorovich
First flight 1931
Primary user Soviet Air Force
Number built 73

The Grigorovich I-Z was a fighter aircraft developed in the Soviet Union during the 1930s. Advances in aircraft survivability thanks to all-metal construction and self-sealing and inert gas-filled fuel tanks led to experimentation with large-caliber weapons to shoot them down. In Soviet Union, L. V. Kurchevskiy developed a series of recoilless rifles in various calibers and in 1930 was decided to adapt the 76.2 mm (3 in) weapons for aircraft use.[1]

The result was a conventional strut-braced monoplane with fixed landing gear. A pair of APK rifles were mounted under the wings outside the propeller arc and the rear fuselage and tail assembly were of reinforced metal construction to withstand the blast. A single small-caliber synchronized machine gun in the left fuselage was added to aid the pilot in aiming.[1]

Two prototypes were built, the first flying in mid-1931. The second strengthened I-Zbis flew at the beginning of the following year. These were followed by 21 examples ordered as evaluation aircraft and 50 production machines. By the time this last batch was being delivered, however, it was already apparent that the concept of a "single-shot" fighter was flawed and the I-Zs that had been built were relegated to various testing roles. One such role was as a parasite fighter in the Zveno project.[1]

Operators[]

 Soviet Union

Specifications (I-Z)[]

Data from Shavrov 1985[1]

General characteristics

  • Crew: One
  • Length: 7.65 m (25 ft 1 in)
  • Wingspan: 11.5 m (37 ft 9 in)
  • Height: ()
  • Wing area: 19.5 m² (209.9 ft²)
  • Empty weight: 1,180 kg (2,601 lb)
  • Loaded weight: 1,648 kg (3,633 lb)
  • Powerplant: 1 × M-22 radial engine, 358 kW (480 hp)

Performance

  • Maximum speed: 259 km/h (140 knots, 161 mph)
  • Range: 600 km (324 nm, 373 mi)
  • Service ceiling: 7,000 m (23,000 ft)
  • Wing loading: 85 kg/m² (17 lb/ft²)
  • Power/mass: 217 W/kg (0.13 hp/lb)
  • Time to altitude: 14 min to 5,000 m (16,400 ft)
  • Horizontal turn time: 17 sec

Armament

  • 1×7.62 mm (0.3 in) PV-1 machine gun
  • 2×76.2 mm (3 in) Kurchevski DRP (APK) cannon
  • See also[]

    References[]

    1. 1.0 1.1 1.2 1.3 Shavrov V.B. (1985) (in Russian). Istoriia konstruktskii samoletov v SSSR do 1938 g. (3izd.). Mashinostroenie. ISBN 5-217-03112-3. 
    • Taylor, Michael J. H. (1989). Jane's Encyclopedia of Aviation. London: Studio Editions. pp. 441. 
    • World Aircraft Information Files. London: Bright Star Publishing. pp. File 895 Sheet 12. 

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