Are Zippy Lipos safe with a Castle MMM Speedy? - Page 12 - RC-Monster Forums

superek4 · 03.04.2009, 12:17 PM

I m so sick of mmmv3 failing me I sold it off n trying hobbywing 150a ezrun with program card d specs looks good n price is even better

Pdelcast · 03.04.2009, 12:20 PM

^^ That was a completely useless troll post. Thank you. Lemme guess, you are in Hong Kong and work for Hobbywing eh?

superek4 · 12:45 PM

dun have to be nasty I m a customer n I was a fan of cc wen mm time, till I tried mmmv2 to v3 I hv so much disappointment. I m from Singapore not hong kong.

Pdelcast · 03.04.2009, 12:50 PM

Quote:

Originally Posted by superek4

dun have to be nasty I m a customer n I was a fan of cc wen mm time, till I tried mmmv2 to v3 I hv so much disappointment. I m from Singapore not hong kong.

Your post was a troll post. "Trolling" is when you post something just to be obnoxious, and not to add any good content to a thread.

If you have had issues with the MMM V3, then you should post here about your problems, and maybe we could help you out. It doesn't do anybody anything useful to just post obnoxious inflammatory posts. ESPECIALLY when you come into my forums and start flaming my products.

lincpimp · 03.04.2009, 01:14 PM

Quote:

Originally Posted by skellyo

If you want to take the pep out of it, either gear way down or drop your voltage down from 6S. Putting the 25T pinion on it is like trying to slow down a drag racer by putting monster truck tires on it...it's just not an intelligent solution to the problem. All you'll do is increase the current draw and start potentially causing heat issues.

The whole point behind what the guys from Castle are saying is to use common sense when gearing these trucks regardless of what the manual says. This post backs that up:
http://www.rc-monster.com/forum/show...&postcount=111

I think by pep he meant the large quantity of torque. Gearing up will put more load on the motor, and may cause it to spool up a bit slower, but it is not a good idea. Maybe adding some more punch control, or some expo to the throttle channel... I guess the CC motor is just too powerful for him

skellyo · 03.04.2009, 01:26 PM

Quote:

Originally Posted by lincpimp

I think by pep he meant the large quantity of torque. Gearing up will put more load on the motor, and may cause it to spool up a bit slower, but it is not a good idea. Maybe adding some more punch control, or some expo to the throttle channel... I guess the CC motor is just too powerful for him

I figured that's what he meant, but it's still not a good idea. Reducing the voltage to the system is a much better alternative to resolve the issue. With 6S, it's possible that the 25T on the stock tires may very well cause heat issues with the MMM. That puts it geared for 70mph without accounting for any tire ballooning.

JThiessen · 03.04.2009, 02:30 PM

Quote:

Originally Posted by lincpimp

I guess the CC motor is just too powerful for him

damn----yer killing me!!!! But, I must humbly say, that yes, it is...

Yes, my little issue is one of control as related to keeping the front tires down a little more. Yes, adjusting the punch control, and maybe playing with the EPA on my DX3 might help some too. Going to the 25T pinion should help with that some. Yes, load(s) on the motor will increase, but that is not necessarily a bad thing (insert all previously mentioned signs of a toasted motor). Until I experiment with it, I have no reason to fear it, correct?

Has anyone heard if Traxxas has any similar recommendations with the ERBL? They may not since they dont carry the warranty.

RC-Monster Mike · 03.04.2009, 04:26 PM

Gearing up won't reduce the "pep" like it does in brushed setups, which are very finite in their ability to produce power. The limiting factor in creating "pep" with a brushless system is ultimately the batteries. If the batteries can deliver, gearing up will make it feel even more powerful. If they can't, then perhaps re-reading this entire thread is a good idea. This "gear up to reduce torque" philosophy is old school brushed thinking and does not apply here(and can be problematic).

Pdelcast · 03.04.2009, 04:33 PM

Quote:

Originally Posted by RC-Monster Mike

Gearing up won't reduce the "pep" like it does in brushed setups, which are very finite in their ability to produce power. The limiting factor in creating "pep" with a brushless system is ultimately the batteries. If the batteries can deliver, gearing up will make it feel even more powerful. If they can't, then perhaps re-reading this entire thread is a good idea. This "gear up to reduce torque" philosophy is old school brushed thinking and does not apply here(and can be problematic).

QFT -- Mike hit it right on the head.

shizzon · 03.04.2009, 04:41 PM

Het Patrick i have and off topic question for you. Does Castle Creations employ many mechanical engineers? I would guess that you would have some, not as many as you have electrical im sure. The reason im asking is that im currently in my junior year for my Mechanical Engineering Technology bachelors and just wanted to see if there are any opportunities for work in the RC-industry.

once again im sorry for the thread-jack

Pdelcast · 03.04.2009, 05:22 PM

Quote:

Originally Posted by shizzon

Het Patrick i have and off topic question for you. Does Castle Creations employ many mechanical engineers? I would guess that you would have some, not as many as you have electrical im sure. The reason im asking is that im currently in my junior year for my Mechanical Engineering Technology bachelors and just wanted to see if there are any opportunities for work in the RC-industry.

once again im sorry for the thread-jack

We have 1 full-time mechanical engineer here at Castle, and several electrical engineers who think they can do some mechanical stuff from time to time... (one of the EEs is me....

)

MrMin · 05:56 PM

If it makes any difference I just took apart my 150A hobbywing and I must say that the mmm seems to be built much better. The screws are barely holding on the fan and it has no firmware upgrades, it also does not handle brushed motors and I have not run it at all yet. All I'm saying is that the mmm is better built and software is much better, and I dont think it will handle cheapo batteries better. BTW: It also has 30V fets x 12(http://www.onsemi.com/pub_link/Colla...NTMFS4833N.PDF).

I agree with mike too.

JThiessen · 03.04.2009, 06:05 PM

Quote:

Originally Posted by RC-Monster Mike

The limiting factor in creating "pep" with a brushless system is ultimately the batteries. If the batteries can deliver, gearing up will make it feel even more powerful.

True...I had my mind wrapped around gear ratio only when I was thinking about it this morning.

lincpimp · 03.04.2009, 06:37 PM

Quote:

Originally Posted by JThiessen

True...I had my mind wrapped around gear ratio only when I was thinking about it this morning.

Just adjust the punch control, and play with your transmitter settings...

Pdelcast · 03.04.2009, 06:57 PM

Quote:

Originally Posted by MrMin

If it makes any difference I just took apart my 150A hobbywing and I must say that the mmm seems to be built much better. The screws are barely holding on the fan and it has no firmware upgrades, it also does not handle brushed motors and I have not run it at all yet. All I'm saying is that the mmm is better built and software is much better, and I dont think it will handle cheapo batteries better. BTW: It also has 30V fets x 12(http://www.onsemi.com/pub_link/Colla...NTMFS4833N.PDF).

I agree with mike too.

MrMin -- are you saying the hobbywing has only 12 FETs?

The MMM has 36 of the Onsemi mosfets.