I am designing a fishing pontoon boat at home. I am wanting to build into the pontoons a small water jet engine on both sides. Does not need to be jet ski type speeds. Just looking for an energy efficient motor that will exceed trolling motor speeds and still be small. I am more of a do it all design and create inventor. Electrical is one of my lesser experienced areas. So the question is. What is a good motor (i.e. Drill, grinder, sander, etc.) that is cost effective and can be found easily that will work on a 12 volt marine battery and can be enclosed inside a pontoon? Would I have heat concerns with the motor? What are specific criteria I need to look for? Voltage and what not. Will I need a separate regulator of sorts for voltage control? This you tube video inspires me that I can do this What say you the physics community? Thanks a bunch for your input, I really do appreciate it.