I purchased two Mega Fury's early Dec this year for the father-in-law and myself to bash around with. The FIL's Fury smoked a motor on its second battery. I fitted (bodgily) a heat sink to mine on the end of the motor, but it blew last week anyway. I've since replaced it with a "Radiant" brand 12T but I've come very close to cooking that too. Now the weather here has been warm recently (25-30 deg c) but today (15 deg c) I went out for a bash in the back yard (very short grass) and after 2-3 mins measured the motor temp at 75 deg c! How the heck do you keep these things cool?