[Gdeaver]

The FP and other can motors have a fan blade inside them. they rely on the fan moving air through the motor for cooling. Because of this they perform best when run at high rpms. Put them under heavy load and the rpm's drop the fan effieciency drops and heat builds. Also note that allot of can motors have ventilation holes on the mounting face. Attach the motor tight to a mounting plate and the fan does not work. I've seen the paint cooked off a cim and they kept on going.