Indeed, thats why i used the cheap €10 onesperfo wrote:I'm afraid I'm still waiting for mine (brush less three phase though) so have very little experience (none) with ESC. Maybe if you post a diagram of how your system is set up, someone with a bit more experience will spot what's going on.. It sounds like a back feed some how..Expensive hobby if you burn too many of them $80..gasp.
I'm wondering if the ESC are water proof enough to fix them out side the hull and thus help keep then cool. From the pictures they look pretty well potted so maybe OK for fresh water ...
On the outside of the hull, don't think so. But i have been wrong before.
If you are worried about the heat, wouldn't water cooling work. Or maybe even connect the heatsinks from the ESC to the hull.