MOTOR SUPPORT WITH GEAR

motor support with gear (2:1 ratio). The external diameter of the motor is 24mm, and the diameter of the shaft is 2mm.

This model is made for this engine: https://www.printables.com/es/model/152321-4-stroke-flathead-v-twin-engine 

If you want the gearbox propeller, this is it: https://www.printables.com/es/model/751721-propeller-for-hexagonal-shaft-7mm