gearing

[mr stroudy]

just a quick question when i got my ax10 i noticed it had a load of spares before i read the instructions i swaped the gear on the motor with the 20t (metal gear) in the packet run nice,but then i read the intructions and noticed its not for that . will it cause any damage or is it ok to use it for this. it seems alot better gearing for what im doing.
im just not sure about metal and plastic together.

i know i should gear it properly the correct way but gearing is confusing on these things,i saw this to be an easy souloution "thumbsup"

 

[Rook82]

The larger gear on the exterior of the transmission is normally plastic on most all rc's stock. There are after market ones made from more exotic plastics or some types of metal. But most people stick with the stock one without any problems. The smaller gear attatched to the motor is almost always aluminum. This will not cause any issues at all from the choice of materials. With the power coming from those small output shafts on the rc motors, it really needs to be made from a metal so it will hold up. With such a small set screw, it would strip quickly if that small gear was plastic. You usually only see that gear made from plastic on some smaller and much less powerful rc's.

What you did by using the 20 tooth gear as opposed to the 14 is move the power band by changing the gearing. Think of it as putting your full size vehicle in a higher gear. it can go faster that way but loses acceleration. Starting off in 2nd in your can will make it accelerate slower but reach a higher speed then if it was left only in 1st.

The only thing changing to the higher gear like you did can cause for bad is a hotter motor. Just check it time to time to make sure it is not getting too hot. Running that larger gear makes the motor work a little harder and causes it to get warmer. It may reduce your run time as well. but if the run time is ok with you and the motor does not get to warm then you are definitely good to go. That is a normal tuning measure for rc's, finding the right gearing for what you need or want out of the vehicle.

 

[Jeykito]

I ran an 87 spur with a 20t pinion and it heated up my motor pretty fast. I was running a 55t rooster though that might have been what caused it.