Thanks for your response,The brushless motor
I have gone for is a JP C50-20.
I can not water cool it as the outer casing of the motor
spins when used.
I only got it last week so that I could get the mount and prop shaft
I still have a lot of the build
to go(not got the decks on yet).
My local model shop
would sell me a esc with a 65amp rating,someone else has told me to go 25amps over motor
I would of thought that if you have a 85amp motor
you go for a 85amp esc.
I have not thought too much about batteries
yet,but looking likely to be lipo.
Told that the 3 bladed brass prop
that came with kit is ok to use.