You are currently on:

Propellers for RC boats. Upgrading your boat with a performance propeller can increase the speed and performance. Boat propellers are categorized by the pitch of the blades and the diameter. A bigger propeller will give a higher top speed but may decrease acceleration and will put more strain on the speed controller and motor. A propeller with a higher pitch basically means they are more angled and increasing the pitch a little can increase top speed but will put more stress on the motor and speed controller. If a propeller is used that has a pitch to high for the motor it will actually make the boat slower because the motor will not have enough torque to turn it fast enough and this may also damage the motor. The RC boat manufacturer should be able to tell you the ideal pitch and diameter to use for your model.
click here