motor for GP electricub
The Magnetic Mayhem Reverse motor is a great value. It is rugged and inexpensive. Depending upon your prop size, a 3:1 ratio is close to what you need.
Tower Hobbies sells different pinion gears to change the ratio, if needed, from your stock gearbox. You might consider purchasing some when you buy the motor.
Prop your setup for about 22amps at full throttle. Your Cub will cruise around at half throttle when airborn.
The Astro Flight geared Cobalt motors are a more expensive brushed solution, but, they will last forever!
Good luck!