Is It Safe...

To run 9 cells through a MGM Compro 8012 and a Feigao 8s?

[captain harlock]

What machine are you using?

http://www.rc-monster.com/forum/show...=&threadid=995

[coolhandcountry]

that is a light weight truck. If the motor don't over wind would be the question. 9 cell is 10.8 volts x the kv which not sure of. 6000 kv would only turn 66000 rpm. If you try it keep a close eye on temps. I ran a 8l on 18 cells. Not sure if it was safe either but still running the motor today. 3000 kv motor on 21.6 volts 64800 rpm.

That's 47,908.8 RPM's. I don't remember if Feigao's have a 60,000 or 50,000 RPM limit. If it's 60,000 I would try but watch the temps.

I think it's 60,000. I think I will do it anyway even if it's not...just for fun. :)

[MetalMan]

Feigao motors have a limit of 50,000 RPM. You would be safe to run 9 cells. It would be good if you could gear it down a little, but I'll bet you just want the pure speed :).

Well, I figure if it's way undergeared on 6 cells (like it is now) I figure going up 3 teeth should work fine with 9 cells.

[Nick]

Originally posted by coolhandcountry
that is a light weight truck. If the motor don't over wind would be the question. 9 cell is 10.8 volts x the kv which not sure of. 6000 kv would only turn 66000 rpm. If you try it keep a close eye on temps. I ran a 8l on 18 cells. Not sure if it was safe either but still running the motor today. 3000 kv motor on 21.6 volts 64800 rpm.

//Offtopic

Isn't the 8L for around 12 cells? :eek:

How did it perform, did it get hot? Low gearing I imagine too. :D

[RC-Monster Mike]

Technically, the Feigaos have a 50000 rpm limit, but this can be pushed without much issue. The real problem will be trying to drive it with all that power! Have fun!

[coolhandcountry]

IF you have the truck geared right for 6 cells. You need to drop a couple teeth when you go up on cells. YOu may want to try it geared like it is first. Just a suggestion. Even though it may go faster with higher gear.

I see...now I need a battery tray for all the cells. What do you guys think? I've got a bunch of 1/8" aluminum, but I don't want it to look hack (I've got a hack saw and a dremel to cut it).