RC parts question about android

Great to see a board devoted to DIYers!

I am designing a foilboard prototype to test ride behind the boat, but I have no RC experience.
If I build an electric setup it is going to be underwater, attached to the foil not the board. The only design I have seen like this is Scubajet, but Scubajet is not currently powerful enough to work for my design.
I weigh about 170 lbs.

I think I am looking for the following parts:

  1. A waterproof motor.
  2. A simple waterproof ESC and transmitter that would work with an android device.
  3. A waterproof battery that would run the motor for 10 minutes.
    Has anyone else attempted this type of design with a submersible system?

Does anybody have a supplier to recommend for RC parts?