Zahnrad-Set 87 : 21 Zähne

To change the reduction ratio on a petrol mechanics, replace the main gear and the spur gear. These change the main rotor speed at constant engine speed.
Which reduction suits each model, in relation to rotor disc diameter and type of rotor head (2-blade or multi-blade), can be seen from the mechanics listed under the required accessories of a fuselage kit.

• Gear set
• 87 : 21 teeth