hello wakejacker and your welcome umm well i just reciently put the submerged drive in and as you see in the pix there is the old stuffing tube for the surface drive and yes i tryed a lot of props probaly about 12 and in the old position the prop would walk to much and when i had the rudder all the way to the other side it would still turn so i dropped it and when it was in the old position when i turned it would bog out and then i have to start over again also the boat was to lite to run it there cuz the wter line is about 2 cm away from the old stuffing tube
so now in the new position i have more prop in the water so it grabs it doesnt cavaita nor porpous and it acclerates quicker and i find that turning it doesnt bog out also for some weird reason my batteries last longer[X(]

and yes thankyou for the advice i now the dynamics of boat and i thought that this would increse the proformance of the boat and it sure did

i also had nitro traxxas blast that i modifedy and i sold it to by a camera to take pics so unfortunitl i have no pics of it but i an thinkig foy buing a .15 and a tuned pipe to mount in it or i will just put the brushless back in ?? i dont now