|Engines||650/750hp M-34||750/815hp M-34N|
|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|
|Guns||1*7.62mm ShKAS on turret;
1*7.62mm PV-1 synchronized;
|Bombs||200kg (2*100kg, 4*50kg or 8*25kg)|
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).
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.
|Modified February 06, 1998;||Back to|