drives

"Trimax is a drive system with a surface piercing propeller completely locked in the running position. However, it is possible to set it in the space of a few minutes to obtain the best possible speed. The fixed shaft with the rudder at the rear of the propeller ensures directional...

Weismann Surface Drives http://www.weismann.net/wsd.html

"POWER-VENT is a patented marine surface drive system designed for high performance boats of any size. Its uniqueness is that it can position high efficiency surfacing propeller technology under the hull of a vessel with more conventional marine hardware and no transom projections.&quot...