Size motors to use with MMP - RC-Monster Forums

J57ltr · **Size motors to use with MMP -** 11.15.2009, 10:12 PM

I have been reading around and noticed that it was mentioned that the MMM’s warranty would be void if the motor used was less that 70mm in length for a 36mm diameter motor. I guess the same would be true if a 2200 or the 2650 was used with the MMP? What are the recommended motors for use with the MMP and 6S? I don’t think any of the current available CM-36 motors (4600Kv-9000Kv) would be a good choice to use with 6S.

Jeff

HomeGrown · 11.15.2009, 10:24 PM

wat are u running it in?.. some of the CC motors will not even let u run 6s.. my 7700 sure dont.. its 2s maxx!..

11.15.2009, 10:34 PM

i think your looking for around 1600-1800kv motors for 6s

J57ltr · 11.15.2009, 11:24 PM

I am really looking for what is the largest (physical size) that should be used with the MMP in any application that it is designed for. It seems that most 540 sized motors are good for about 500-600W and the MMP is capable of about 1700W. I know that a motor the size of the ones used for the MMM are too large and would draw too much current for the MMP, so what are the appropriate sized motors to use?

Jeff

J57ltr · 11.18.2009, 01:09 AM

Anybody have an answer for this?

Jeff

BrianG · 11.18.2009, 01:36 AM

I could be wrong here, but I believe CC's recommendation for X size motor is basically just to provide a basic guideline for noobs. Of course, any motor can be the wrong size depending on how it is used, gearing, etc. It basically prevents people running the CC5700 motor in a heavy MT.

As long as the current and voltage are at or under the ESC's capability (6s and ~80A), there really is no limit. Choose a proper size motor for the job with the right kv for the voltage used, gear appropriately, and there won't be any problems.

Unsullied_Spy · 11.18.2009, 02:25 AM

Quote:

Originally Posted by BrianG

I could be wrong here, but I believe CC's recommendation for X size motor is basically just to provide a basic guideline for noobs. Of course, any motor can be the wrong size depending on how it is used, gearing, etc. It basically prevents people running the CC5700 motor in a heavy MT.

As long as the current and voltage are at or under the ESC's capability (6s and ~80A), there really is no limit. Choose a proper size motor for the job with the right kv for the voltage used, gear appropriately, and there won't be any problems.

+1, I could run my MMM in my Mini E-Revo and there's no chance in hell they could deny a warranty claim

There was somebody in one of the MMP threads that posted about running a race with the 2200 and a MMP and Patrick congratulated him (I think he did well in a race). Keep the amp draw down and you have nothing to worry about.

What are you planning to put this in and how fast do you want it to go?

J57ltr · 11.18.2009, 08:49 PM

I have wanted to build a high speed car for a while now and am debating if I should get the MMP or MMM. I have a Lightning 10 buggy, that I think would do a pretty good job, but I don't think I can get the MMM under the body but the MMP seems to be a good fit, I think the current is a little on the low side, but the 6S capability would make up for it.

I have run as high as 4S A123 on the MM and it does pretty well, but I have to use a UBEC since it seems to shut off for a few seconds (does the same on 12S Nimh also) so I think the BEC is shutting off. On 4S it really screams but I saw a few peaks of 178 amps (kinda high), but it keeps rocking and rolling.

It would seem to me if you used a 2200 on 6S or a mini erevo motor on 6S it would kill the MMP for sure. Patrick mentioned in one thread that the 2200 could draw in excess of 2K amps and in another thread that they would not warranty a MMM used on a motor less than 70mm long. I cant find the thread for the 70mm statment, but it made since to me at the time. I looked most of the evening yesterday but Patrick posts a lot and I get side tracked easily.

Jeff

Pdelcast · 11.19.2009, 01:04 PM

Quote:

Originally Posted by J57ltr

Patrick mentioned that they would not warranty a MMM used on a motor less than 70mm long.
Jeff

I don't recall ever making that statement. You can always run a smaller motor on a big controller. The MMM can commutate a motor just as fast as our smaller controllers, so there is no real limit on RPM on the MMM.

J57ltr · 11.19.2009, 10:15 PM

Quote:

Originally Posted by Pdelcast

I don't recall ever making that statement. You can always run a smaller motor on a big controller. The MMM can commutate a motor just as fast as our smaller controllers, so there is no real limit on RPM on the MMM.

Ok it wasn't you it was Joe and it was 68mm not 70. I guess I remember seeing the Castle logo and since you were the last one to post I thought it was you.

http://www.rc-monster.com/forum/show...ght=warrantied

I would like to use the MMP unless you recommend against it. I would also like to keep in warranty at least until it is up. I need something smaller than the MMM combo to keep it under the buggy body, there isn't a lot of room under there. Since I don't plan on bashing around with this car (at least with the same setup) so would be recommended for this application?

Jeff

LiqrSicc · 11.19.2009, 05:30 PM

Quote:

Originally Posted by J57ltr

It would seem to me if you used a 2200 on 6S or a mini erevo motor on 6S it would kill the MMP for sure. Patrick mentioned in one thread that the 2200 could draw in excess of 2K amps and in another thread that they would not warranty a MMM used on a motor less than 70mm long. I cant find the thread for the 70mm statment, but it made since to me at the time. I looked most of the evening yesterday but Patrick posts a lot and I get side tracked easily.

Jeff

I have a mini-revo running 6s on my MMP with a Neu 1115. I think the MMP is more than capable. So far I havent seen temps over 140. I get my Eagletree this weekend so I can see what kind of amps I'm actually pulling.

BrianG · 11.19.2009, 06:07 PM

Quote:

Originally Posted by J57ltr

It would seem to me if you used a 2200 on 6S or a mini erevo motor on 6S it would kill the MMP for sure. Patrick mentioned in one thread that the 2200 could draw in excess of 2K amps and in another thread that they would not warranty a MMM used on a motor less than 70mm long. I cant find the thread for the 70mm statment, but it made since to me at the time. I looked most of the evening yesterday but Patrick posts a lot and I get side tracked easily.

Jeff

I don't know why you would say that. Motor current is a function of load (gearing, weight, etc) for the most part. In something as small as the mini ERevo, there is practically no load, so you'd be lucky to draw 10A max, and most of that would be the power required just to accelerate the rotor by itself. Frankly, I'd be more worried about the drivetrain.

J57ltr · 11.19.2009, 10:37 PM

Quote:

Originally Posted by BrianG

I don't know why you would say that. Motor current is a function of load (gearing, weight, etc) for the most part. In something as small as the mini ERevo, there is practically no load, so you'd be lucky to draw 10A max, and most of that would be the power required just to accelerate the rotor by itself. Frankly, I'd be more worried about the drivetrain.

Dunno I guess I was tired.

11.18.2009, 11:01 PM

Quote:

Originally Posted by Unsullied_Spy

+1, I could run my MMM in my Mini E-Revo and there's no chance in hell they could deny a warranty claim

There was somebody in one of the MMP threads that posted about running a race with the 2200 and a MMP and Patrick congratulated him (I think he did well in a race). Keep the amp draw down and you have nothing to worry about.

What are you planning to put this in and how fast do you want it to go?

yea i run my castle 2200kv on my mmp in my d8e runs great !

J57ltr · 11.18.2009, 11:08 PM

on 6S?