I dig the concept, but I'm not sold, look, we ain't got no ice here but in our glasses.
Starters> your rudder system is BS. Four rudders at the outside of the prop??? If I haftadoit we are mounting that crap on the prop inlet where it can make a difference (drives like a bobcat).
Props suck air from everywhere and compress it into the center, how else would it make thrust? Think about it, what happened to that air?
Y'all's rudders are in the most useless place to control the boat with the engine. Perhaps they come into their own at 100 mph???
Read my threads for more.