[E-Revonut]

Brushless motors in general are waterproof so long as you clean them afterwards and keep the bearings lubed. No matter what motor you choose I would recomend the MMM for an esc, it is a very solid and reliable esc. Runtime will depend on your batteries, grearing, driving style, weight, tires, etc.....There are many variables that contribute to your runtime or lack of. The MMM 2200kv is most likely your best choice, if it's to fast, gear it down which will also increse your runtime. When you decide you want more speed hook it up to 6s lipo and let it rip!