why using a gear with the motor in a small RC plane?

Burf6 years ago
One or more of the following reasons:
1)To offset the propeller from the centerline of the crankshaft
2)To reverse the direction of spin of the propeller
3)To increase the propeller's RPMs or torque, one or the other
4) As an exercise in engineering design
Re-design Burf6 years ago
It's usually to decrease the rpms and gain torque so you can put on a bigger prop that will pull more air and be more efficient. I've seen rc planes running very wide props that you could almost count the rpms.

Many modern motors rely on high rpm. In order to develop sufficient torque, one needs to reduce the RPM
ARJOON6 years ago
perhaps it will increase the turn rpm of turbines or increase the torque lowering the rpm depending on your motor