Rotor for the goat

[trx310r]

http://www.shopatron.com/product/par...56.35129.0.0.0
i just saw this on novac's website, it's a 14mm rotor for the goat, do you think it'll help cut down on motor temps.i have a 14 tooth with a 2s2p 3300 mah lipo motor get scorching hot and run times of only 32 mins.i've checked the diffs and tranny.same motor w/ 1600 mah in axial would go for 45min. and not get hot at all

[gunnar]

The rotor is to help smooth up the low end on the Goat motor, and is supposed to provide alittle more torque. It probably won't do much for temps. I did not experience super hot temps when doing my Goat testing, with 15 tooth pinion. I got about 30 minutes on a 1600mah battery.

[kikcaffine]

Im only hitting 115 with my EXACT same power train setup

[trx310r]

i figured out my temp issuse,it was from too many shims in the diffs and front wheels over tightened.i got 1hr20min out of the goat with 3300 mah losi battery highest motor temp was 145*. i put in the 14mm rotor and raised my pinion to a 18 from a 14 and this thing is bad a$$.tons of torque tons of wheels speed runs forever(got tired before that battery went dead)and never temped over 104* on the motor.so i would say the goat set up with a optional 14mm rotor is a good setup.

[latentimage74]

Originally Posted by trx310r

i figured out my temp issuse,it was from too many shims in the diffs and front wheels over tightened.i got 1hr20min out of the goat with 3300 mah losi battery highest motor temp was 145*. i put in the 14mm rotor and raised my pinion to a 18 from a 14 and this thing is bad a$$.tons of torque tons of wheels speed runs forever(got tired before that battery went dead)and never temped over 104* on the motor.so i would say the goat set up with a optional 14mm rotor is a good setup.

when you say your wheels were over tightened do you mean your knuckles or the actual nut that holds the wheel on?

[trx310r]

the actual nut,it caused the pin to bend into my bearings,causeing drag/friction

[Dxxcrawler]

Originally Posted by trx310r

http://www.shopatron.com/product/par...56.35129.0.0.0
i just saw this on novac's website, it's a 14mm rotor for the goat, do you think it'll help cut down on motor temps.i have a 14 tooth with a 2s2p 3300 mah lipo motor get scorching hot and run times of only 32 mins.i've checked the diffs and tranny.same motor w/ 1600 mah in axial would go for 45min. and not get hot at all

I have been running the rotor for some time it's works great more torque and it's slows the motors top end down but worth it way more smooth. temp on my losi with that rotor is at 97 for esc with fan and 94 motor.

[kikcaffine]

Does changing the rotor make it not that have jump when you initially hit the throttle?

[trx310r]

not sure i never had that problem with the goat setup,with either rotor

[kikcaffine]

When you went to the 18t pinion did you lose any low torque?

[JohnRobHolmes]

Originally Posted by kikcaffine

Does changing the rotor make it not that have jump when you initially hit the throttle?

A larger rotor will make the airgap smaller, which will actually increase that initial jump to get the motor going.


The 14mm rotor is good for increasing torque at a sacrifice to top speed.

[kikcaffine]

Originally Posted by JohnRobHolmes

A larger rotor will make the airgap smaller, which will actually increase that initial jump to get the motor going.


The 14mm rotor is good for increasing torque at a sacrifice to top speed.

Interesting, why does it lose top speed? Because of more rotating mass?

[trx310r]

yes but it also allows you to go up in pinoin size to regain your speed while still having torque,does more work with less effort

[JohnRobHolmes]

It will do more work with more effort, you don't get anything for free. Power is power whether it is made through rpm or torque.

The larger rotor strengthens the magnet field in relation to the windings, which drops Kv (rpm per volt). Any time the magnets get stronger the Kv will decrease.

[trx310r]

if your kv goes down but your getting more torque,wouldn't you be doing less effort to get more+or in other words more effic.

Originally Posted by JohnRobHolmes

It will do more work with more effort, you don't get anything for free. Power is power whether it is made through rpm or torque.

The larger rotor strengthens the magnet field in relation to the windings, which drops Kv (rpm per volt). Any time the magnets get stronger the Kv will decrease.

[JohnRobHolmes]

More torque per amp (Kt), but it is at a lower RPM. Power involves both rpm and torque.

[trx310r]

ok,well i'll i know is the goat with a 14 mm rotor rocks

[latentimage74]

Originally Posted by JohnRobHolmes

More torque per amp (Kt), but it is at a lower RPM. Power involves both rpm and torque.

john do you have the losi? if so what are you running and how is it working out for you?

[JohnRobHolmes]

I don't have the losi.

[kikcaffine]

Can I order the rotor from you john?