I think this is a great idea but I’m not sure at the moment that 2,2 kW is enough to get on the foil. It probably is with a custom foil with a big surface area or a SUP foil for exemple.
From my point of view, Epoxying the motor is not the best way to go since it’s pretty hard to do it properly and a lot can go wrong throughout the process. Also, I personally am alergic to Epoxy resin (Discovered it while epoxying the board…).
So far I’m going on a 6384 motor, oil-cooled inside an aluminium tube sealed. The setup is really small in length ( 145mm long) and 70mm in diameter. The problem is the friction induces by the oil.
In my opinion, the best way to go would be to go for a smaller motor (maybe a 5070 one with 100Kv or lessif possible), mounted inside a 55mm tube… Cooling could probably be done via an aluminium plate linked both the the aluminium tube AND to the stator of the motor.
If cooling is OK, this setup would be super reliable, easy maintenance, low costs, low drag.