Technical data
Type LR first
TsKB-1
LR second
Function Light reconnaissater
Year 1933 1934
Crew 2
Engines 650/750hp M-34 750/815hp M-34N
Length 8.64m
Wingspan 13.0/10.8m
Wing area 36.52m2
Empty weight 1734kg 1812kg
Loaded weight 2426kg 2626kg
Wing Load (kg/m2) 66.5 72.5
Power load (kg/hp) 3.7 3.5
Speed at 0m 271km/h 282km/h
Speed at 5000m 247km/h 314km/h
Landing Speed 93km/h 94km/h
Landing Roll - 18sec
250m
Takeoff Roll - 13sec
210m
Turn time 17sec
Range 700km 800km
Flight Endurance 3.5h
Ceiling 7400m 9100m
Climb
1000m 2.2min 2.0min
2000m 4.6min -
3000m 7.3min 6.0min
5000m 15.6min 10.7min
Armament
Guns 1*7.62mm ShKAS on turret;
1*7.62mm PV-1 synchronized;
Bombs 200kg (2*100kg, 4*50kg or 8*25kg)

LR, TsKB-1 by S.A.Kocherigin

"History of aircraft construction in the USSR", Vol.1 p.449;

Despite a complete success of the R-5, the necessity of smaller and faster reconnaissater became more and more clear to keep up with new faster fighters. In 1932 order on the LR was issued to S.A.Kocherigin team and KOSOS (A.N.Tupolev).

A.N.Tupolev was busy with heavy aircraft, and his project was not finished. S.A.Kocherigin took the R-5 as a prototype.

The LR had smaller size, new more powerful Mikulin M-34 engine. Fuselage frame was made of steel tubes. Skin - aluminum (nose) and fabric (cockpits and tail). Wings - wood. Landing gear similar to those of R-5, but with air-oil shock absorbing struts and disk brakes (novelty in the USSR). Cooling system included oil radiator and retractable water radiator.

Construction was very light. The first LR airframe weight was only 640kg, while engine weight was 613kg and engine cradle another 384kg. During trials and refinement aircraft weight gained about 100kg...

LR could be used as a two-seat fighter, but its armament was too light. It was ready in July 1933. First(?) takeoff attempt on January 27, 1934 (Yu.I.Piontkovskij) resulted in crash - assembly workers swapped the aileron control wires... Nobody was hurt and damage was minimal. After repairs, LR passed State Acceptance Trials less than one year later. Flight performance was very good, specially with high-altitude M-34N engine installed on the second prototype.

Only two prototypes were built. The R-Z was preferred, because it required less design changes from R-5 and it was easier to put it into mass production.

References:Links:
  • "History of aircraft construction in the USSR", Vol.1 p.449-450;
  • LR at Russian Aviation
  • LR light reconnaissater
  • LR, Kocherigin
  • TsKB-1, Kocherigin
  • R-5 and R-Z
  • LR photo

  • Modified February 06, 1998; Back to
    Main Gate