Arriel 2B has an
- N1 = 52,110 RPM
- N2 = 39,095 RPM
- and an output speed: 5990 RPM
There is no way to transmit 39K RPM in the main gear box as might have been suggested
this requires much different technologies on: the gears, the bearings, the oiling, the assembly rigidity...
much different than handling 6K RPM
note the power is generally distributed as follow
- 82 % main rotor
- 10% tail rotor
- 8 % efficiency losses in gear box + accessories