MI-3/ANT-21, MI-3D/ANT-21bis, A.N.Tupolev

win-engined multi-seat fighter, development of the R-6/ANT-7 reconnaissater. The MI-3 was an all-metal monoplane with retractable undercarriage, of stressed-skin construction with partial flush riveting. The engines were copies of the BMW VI.
Only one MI-3 was built. During test flights problems with tailfins resulted in collapse of rudders upper parts. Pilot I.F.Kozlov managed to land the aircraft, cutting away landing gear.
Serious redesign produced the MI-3D (D stays for Dublior, the 'spare second one') with a single tailfin. The ANT-29 was then already the preferred aircraft, and the ANT-21bis (MI-3D) did not enter production. According to [6](Vol.2 p.10) the preferred aircraft was the SB with better flight performance.
Aircraft is interesting as a transitional design. In the second prototype (MI-3D/ANT-21bis) open cockpits and turrets were replaced by enclosed. Corrugated skin was replaced by smooth one, general aerodynamics was improved.

ANT-7 R-6

  • 'History of aircraft construction in the USSR', by V.B.Shavrov Vol.2 p.10
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  • ANT-21, Tupolev
  • MI-3, Tupolev
  • MI-3 Page from Emmanuel Gustin Catalog;
  • Technical data
    Type MI-3
    Function fighter
    Year 1933 1934
    Crew 3
    Engines 2*680hp M-17B 2*?hp M-34N
    Wing Span 19.11m 20.76m
    Length 12.31m
    Wing Area 52.10m2 59.20m2
    Empty Weight 3412kg 4058kg
    Flight Weight 5088kg 5955kg
    Maximum Weight 5436kg 5608kg
    Wing load 97.6kg/m2 92.2kg/m2
    Speed (0m) 351km/h 285km/h
    Speed (5000m) ? 350km/h
    Ceiling 7885m 8300m
    Range 1120km ?
    Guns 1*g20mm
    Modified April 8, 1997
    by Alexandre Savine;
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