Originally Posted by
AznDrvr
I have a 1/10 Tamiya I use for Rallying and bashing but, I was more asking in general. I mean by calculations you can come up with 1:1 gearing then that means your gearing is right, in theory. So then if your motor is running hot that would mean you have the wrong motor? So if your gearing is right and your motor isn't broken then other factors play into this "gearing/motor combination", correct? Then assuming everything is working on your RC (i.e. everything that needs to be moving/spinning freely is doing so, etc.), something else is overworking the motor. I feel like the weight would be the major factor here. I'm not an engineer or physicist or mechanic so, I don't know. But, if trying to determine which way to go with the motor, which way would it be? Do you need a higher/lower kv/turn motor?
Certainly, the vehicle weight is a factor to consider when gearing. Note that it says in that sticky post that the given calculations are for 1/10 scale vehicles. Another factor is the physical size of the motor. You could have a 380-size motor rated at 4300kv and a 540-size motor rated 4300kv. Which one will run hotter? In the same vehicle, the smaller can of the 380 will run hotter than the larger 540. The larger the motor the more torque it has. The more torque it has, the less it has to "work", and the cooler it will run. Also note that while the calculator is optimized for tenth scale, the actual size and weight of any given vehicle can vary widely.