Max Prop
Automatic Feathering Propeller

Max-Prop in Pictures

Under Sail
The Max-Prop Feathers to a low drag shape. Compared to a folding propeller the Max-Prop will have similar drag. The extra wetted surface of the Max-Prop blades is offset by the reduction of projected area: A.
In Forward
The torque of the prop shaft acting on a "differential" type design will open the blades in unison to the pre-set pitch at any throttle setting. This will provide maximum efficiency (96% of same sized fixed prop) plus eliminates the vibration problems of a folding prop.
In Reverse
As in forward, the torque of the shaft will rotate the blades 180 degrees in less than 3/4 of a shaft rotation, presenting the same leading edge and pitch in reverse. This provides better directional control and 80% greater power that a comparable fixed blade propeller.

All Max-Props are adjustable. When installing any new propeller on a boat, the propeller should allow the engine to reach its full rated RPM's under all conditions. If not, the propeller will overload the engine thus shortening its life, increase fuel consumption and black smoke will come out of the exhaust (unburned fuel). With the Max-Prop propeller you can adjust the pitch of the propeller in order to maximize your engine efficiency and life.

When comparing boat speed between two propellers, the comparaison is valid only if both propellers allow the engine to attain its rated RPM.

 

Any propeller manufacturer can overpitch or oversize a propeller in order to attain better speed in normal conditions and look good during a test (and so can we), however the gain of boat speed in these conditions is offset by problems induced by engine overloading in rough weather.

In short when you read and evaluate articles, testimonials, or claims by various manufacturers, first check that the comparaisons are valid in all conditions and not only in a test tank or in ideal weather.