This might be a silly idea
I know nothing about electric boats because I am used to gas and nitro.

Has anyone every used a cordless drill components.

The motor / chuck for clamping to the prop shaft and the battery

I have a spare 12v cordless drill with 2 speeds and is powerfull with forward and reverse

What you think

yea i remember back in a post that som guy waz puttin a cordless in his boat but the chuck waz pretty thick. i think he worked it. dunno ask da pro guys they might no tho. great idea tho.

p.s i just got a 46 nitro do u no how many cc that type of motor is

nitro, sounds like a lot of work, but a fun project. I say go for it. Good idea

Actually we are planning to use a Dewalt Drill motor to power a 60 inch model of the Red October. We have used them very successfully to power 1/6 scale combat tanks that shoot paintballs. Plenty of torque. If you really want some fun look at wheel chair motors that are used to power combat robots.

A 46 is about 7.5cc

This sounds like a good idea then
I am considering buying a 42" cruiser which has a small motor in it, not sure on the size it has.

I will make a new post when i start it from start to finish

Does anyone have any pictures or info on fitting or layouts ( im a complete novice with electric boats )

I hooked 21 3700MaH cells to an 18v Dewalt drill motor last night, and it near jumped out of my wifes hands. Forget the chuck, and while the motor is turning in a vice on 6-7 cells, use a mill (*******) file to grind away the shaft until it fits into a 5mm coupler. Then make a motor mount to fit the bolt pattern. Also will need to put diode or capacitors to reduce motor noise and keep servos from glitching. But I bet that it would power a good sized prop without burning up.
Duck