HI MadMax
Hobbyking.
Motor 3648-1450kv
ESC car HK-100A with reverse(programme card required)
Battery Zippy Compact 5800mah 4S 60C ( good charger required)(about 1/2 an hour per battery).
Battery alarm( the black case ones are better).
Prop 40mm x 1.4 pitch alloy.
These motors like to rev so over prop-ing slows the boat, loads the motor and ESC, also cuts your run time.
A Turnigy Watt Meter is very helpful when testing other props, etc.(code TR-WATTMETER).
Order connectors( I like the XT-60 ones) less problems with shorting out and you cannot reverse them.
Motor and ESC require NO cooling, so, no plumbing!!!