As the pitch increases, the load on the engine increases too, since the propeller «grips» a larger amount of water, leading this way to the reduction of its rpm. The reverse happens when we decrease the pitch.

To determine the effect of the propeller’s pitch on the boat's performance as accurately as possible, we tested three exactly same propellers, the only difference of which is the size of their pitch, on a Suzuki 300hp which was mounted on a 930 Marvel rib.