Planet Arduino

The Hobbyking SS series comes with a limited range of programming functions and are designed to be plug-n-play.
A perfect ESC for those looking for something simple to use and economic.

Spec.
Weight: 63g
Size: 55x35x8mm
Cells: 12-24Ni MH ~ 4-8S Li Po
Max Current: 60A
Burst : 70A
No BEC
Timing: 1/7/15/30 programmable
PWM: 8/16K

Features.

Constant current 60A Max 70A

Li-Poly 4-8 cells

Low Resistant 0.0017 Ohms;

Dynamic Braking

BEC: opto

Auto shut down when lose signal

Slow down at 3.0V per cell Lipo, Cut-off at 2.9V per cell Lipo 0.8V NiMh

User Programming options.Battery setting
Throttle Range
Brake setting 4 options: Direction and Cutoff Type
Timing Mode Setting: 1 / 7 / 15 / 30
PWM setting: 8K/16K

Marinize an aero ESC with a TicTac box some epoxy Aluminium tube and hot glue. A nice water tank directly on the heatsink over the FET's lots of volume flow seems more than adequate  Its epoxied on with hot glue over that to seal any holes.

My plan is to use this ESC on theis motor

OutBoard Motor Set - Sprint F3 Tunnel Hull Racing Boat (630mm)

It don't have much specification on HK's site but my understanding is it a 

2185KV 28mm diameter ,33mm length with a 3.17mm shaft weight 230g  I got the 32 mm prop too.

Looks like a nice quality device seems to have great reviews on HK's site

 Its air tight and if it get hot enough to melt the hot glue its probably toast in any case