i guess so those guys are crazy.. lol
i like following the threads over there..
heres a better one 115 mph jet ski "propski" seal the bottom of the ski and ran the shaft straight out the back with a prop.. lol
he's selling kits soon so even I could go this fast on a ski one day.. lol http://greenhulk.net/forums/showthread.php?t=47449&highlight=propski
here's a vid..