Efficiency means better use of available resources
The characteristics of electric motors are different from diesel motors and this has to be borne in mind when choosing a propeller. Most of our knowledge regarding the choice of an appropriate propeller for your boat is based on diesel motors.
The most efficient propellers are slow turning and large in diameter. It reduces ‘slip’. Slip is the difference between the actual distance the prop travels forward through the water versus the distance it should theoretically travel. Think of a nut slipping on a bolt because essentially a propeller is a screw thread.
However, bigger propellers turning at slower speeds cause motors to overheat. So like most things boating, it’s a compromise.
Mothership Marine is working hand in hand with Bedford University to find the most agreeable compromise.