ANT-23/I-12 'Baumanskij Komsomolets', V.N.Chernyshov/ A.N.Tupolev

42k b/w drawing of ANT-23 from the "History of aircraft construction in the USSR" Vol.1 by V.B.Shavrov, p.439

T
he I-12 had a central nacell with a pusher and a tractor engines, and very slender twin tail booms. It was armed with two recoilless 76mm cannons, incorporated in the hollow tail booms! I-12 was proposed and designed by Victor Nikolaevich Chernyshov, working at the AGOS section of the TsAGI
Aircraft took of at the end of 1931, but refinements lasted until 1933. Aircraft failed to pass factory tests due to poor flight characteristics. Tall fixed landing gear, poor aerodynamics of engine cowling, metal corrugated ('gofre') wing skin produced huge drag. Plus a common mess of tandem engines - pusher propeller efficiency drops in air flow disturbed by the tractor propeller.
But the worst was that there were no way for pilot to bail out. Pusher propeller had no emergency stop/drop system, and the cockpit was not equipped with catapult.
On May 19, 1932 first attempt to fire cannons. One APK-4 exploded, damaging tail boom. Test pilot I.F.kozlov landed crippled aircraft safely.
Only one prototype was built. Second ANT-23bis, equipped with emergency systems was not finished.
Sources [6], Vol.1 p.439-440;
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  • ANT-23, Tupolev
  • I-12, Tupolev
  • Technical data
    Type I-12, ANT-23
    Function fighter
    Year 1931
    Crew 1
    Engines 2*420/525hp Bristol Jupiter IV
    Wing Span 15.60m
    Length 9.50m
    Wing Area 30.00m2
    Maximum Weight 2400kg
    Speed at 0m 300km/h
    Speed at 3000m 280km/h
    Armament 2*76mm APK-4
    Modified May 9, 1997
    by Alexandre Savine;
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