TRANSMISSION FOR LIGHT HELICOPTER «AKTAI»

The transmission consists of the main gearbox VR-10, tail rotor shaft HV-10 with a fan and a brake and the tail gearbox HR-10.

Purpose - transfer of power from the VAZ-4265 engine to the main and tail rotor and helicopter accessory gearboxes with the corresponding change of the rotational speed and the values of torque as well as aerodynamic forces from the main and tail rotor shaft through the gearbox housings to the helicopter fuselage.

Type of gearboxes:

main gearbox – three-stage arrangement, first stage is conical, second stage is cylindrical, third stage is planetary;
tail gearbox – one-stage conical.

MAIN TECHNICAL SPECIFICATIONS

	VR-10	HV-10	HR-10
1. Gear ratio: to main rotor shaft to tail rotor shaft	0,0624 0,5	- -	- 0,862
2. Input shaft ration speed, nominal, RPM	6000	3000	3000
Power being transferred: maximum from engine, h.p. in the takeoff mode, h.p. in the nominal mode, h.p.	290 270 200	97,3 97,3 50,3	80 80 33
Mass, kg	62	9,7	6
Overall dimensions, mm: length width height Ø fan	650 600 1050 -	4200 - - 460	500 340 145 -

Developer: OJSC “Krasny Octiabr”

The tail transmission and the main gearbox VR-10 has been designed in accordance with the certification basis requirements of the aviation regulations AP-29.