Unmanned coaxial helicopter developed with Daewoo (S.Korea), initially for agricultural use, later several military roles. Two P-033, 250kg loaded, 45min at 110km/h.

Bill Gunston "The Osprey Encyclopedia of Russian Aircraft", 2000

Technical data for Ka-37

Engine power: 45kW, take-off weight: 250kg, economic cruising speed: 110km/h, hovering ceiling: 2500m, range: 530km, endurance: 45min, payload: 50kg