Main gearboxes of "kamov" helicopters


The gearboxes VR-252, VR-226N, main gearboxes VR-80 and intermediate gearboxes PVR-800-1, PVR-800-2 are designed for installation on coaxial helicopters Ka-27/28, Ka-29, Ка-31, Ка-32, Ka-226T, Ка-50, Ка-52, Ка-50-2

The purpose is to transfer power from two engines ТV3-117VМ/VМА (VR-252, VR-80, PVR-800-1,-2), AI-450, Allison, Arrius (VR-226N) to two coaxial rotors and helicopter accessory with the corresponding change of the rotation speed.

The main gearbox circuit is fixed-ratio, planetary (VR-252, VR-80) and multi-flow (VR-226N).






Main technical specifications

Gearboxes VR-226N (for Arrius-2G1) Gearboxes VR-252 Main gearboxes VR-80 Intermediate gearboxes PVR-800-1,-2
Gear ratio to main rotors shafts 0,0472 0,01815 0,05027 0,4150
Input shaft rotation speed, nominal, RPM 6000 15000 6231 15000
Power being transferred by gearbox, h.p.: maximum in single-engine operation mode
  • in the takeoff mode
  • in the nominal mode
  • in maximum duration mode


710
2x580
2х500


2425
2х2200
2х1700


2400
2х2100
2х1700


2400
2100
1700
Mass, kg 300 1025 925 69
Overall dimensions, mm:
  • length
  • width
  • height

878
1035
2070

1066
1415
3114

1130
910
3375

625
524
606
Developer Krasny Octiabr Klimov Corporation