Technical data
Type MI-3
ANT-21
MI-3D
ANT-21bis
Function fighter
Year 1933 1934
Crew 3
Engines 2*680hp M-17B 2*830hp M-34N
Wing Span 19.11m 20.76m
Length 12.31m
10.85m?
11.57m
Wing Area 52.10m2 59.20m2
Empty Weight 3412kg 4058kg
Flight Weight 5088kg 5955kg
Maximum Weight 5436kg 5608kg
Wing Load (kg/m2) 97.6 92.2
Speed (0m) 351km/h 285km/h
Speed (5000m) ? 350km/h
Ceiling 7885m 8300m
Range 1120km ?
Armament
Guns 1*g20mm
3*mg7.62mm

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

16k b/w MI-3 from History of aircraft construction in the USSR Vol.2 p.9

Twin-engined multi-seat fighter, development of the R-6/ANT-7 reconnaissater. Project started on January 1932 (by some sources - January to March 1931).

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. Repairs and redesign program began on March 1 1932.

16k b/w MI-3D from History of aircraft construction in the USSR, Vol.2 p.9

Serious design revision produced the MI-3D (D stays for Dublior, the 'spare second one') with a single tailfin. Tail section was 'borrowed' as a whole from DIP-1, machineguns were replaced by 20mm 'Aerlikon'.

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.


PredecessorsModifications

ANT-7 R-6
ANT-29 DIP


References
  • 'History of aircraft construction in the USSR', Vol.2 p.10


  • More Links...
  • MI-3, ANT-21
  • ANT-21, Tupolev
  • MI-3, Tupolev
  • MI-3 Page from Emmanuel Gustin Catalog;

  • Modified April 8, 1997 Back to
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