You have to remmember that when you use an R/c car it does generate a hell of a lot of heat. You may even remmember those stickers that Tamiya puts on their motors - they aint for show!

Once, when repairing a buggy in the shop one day, we tested it before giving it back to it's owner. It flew like mad, the guy had fitted a 15x2 motor, which is madness for big wheels. But it had an ESC with built in failsafe, which would turn off if it got too hot. It took the whole 3000MaH battery, (20mins!) and when we brought it in it was piping hot.

A great and simple test for heat is to lick your finger and wipe some saliva on the motor can. Count the seconds it takes to evaporate from the hot surface. If it's less than 4 on a Nitro car, it's running too hot. On this particular electric buggy, it had dried up before we got to 3! - We sold the guy a heatsink...

Chris.