"Q-SPD is the first and only commercially produced ALL COMPOSITE Surface Drive System. Q-SPD is available in range of models that can absorb...
65' Fountain 3000R Twin 1350 HP Caterpillar
"Trimax is a drive system with a surface piercing propeller completely locked in the running position. However, it is possible to set it in...
Weismann Surface Drives http://www.weismann.net/wsd.html
http://www.weismann.net/wsd.html
A diagram of the Power-Vent integrated surface drive system which Gary originally posted in this thread:...
"POWER-VENT is a patented marine surface drive system designed for high performance boats of any size. Its uniqueness is that it can position...
A great cutaway view of the best surface drives there are - http://www.arneson-industries.com