Zahnrad-Set 90 : 18 Zähne

To change the reduction ratio on a petrol mechanics, swap the main gear and the spur gear. These change the main rotor speed while the engine speed stays the same.
Which reduction suits each model in relation to rotor circle 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
• 90 : 18 teeth