RE: 47 Coast Guard Build
The Novak HD esc is designed as an E-Maxx replacement. It is meant to have an open body shell over it and copius amounts of air circulating around it. When car esc's get stuffed inside closed boat hulls, they overheat. The esc fan would be an excellent idea. Also, some open windows would help. I have installed water cooling tubes as well as a fan to blow over the car esc I will be using in my 47' MLB.