This mechanical system has been developed specifically for the Bo 105, so that the model helicopter can be fitted with a VARIO G230 petrol engine.
In contrast to the full-size machine, it is designed for a 4-blade main rotor, and for a 2-blade main rotor also.
Without motor and petrol components (see Ord.No. 26/100).
Gear ratio of this mechanics is 10,9:1.