VR-8A

VR-8A Main Gearbox is designed for operation as part of a propulsion unit of a helicopter Mi-8, Mi-8T.

 

vr8
Transmission ratio
to a shaft of a main rotor 
to a shaft of an antitorque rotor 


0,016

0,2158
Input shaft speed, nominal, rpm 

12000
Power transmitted by a Main Gearbox, hp:  
at take-off mode  
at nominal mode 
2×1500
2×1200
Weight, kg 785
Dimensions, mm  
Length
Width
Height
1055
880
1759
Resourses:
Total Service Life, h.
Time Between Overhaul 

13500
1500
with extension up to 2000 hours according to technical conditions 
Storage time, years 12

JSC UWCA has been performing the overhaul of VR-8A Main Gearboxes since 1975.
Main Gearboxes of VR family have good reliability and resource rates.