1/8 Buggy w/ a Outrunner Motor

[BrianG]

Thanks for doing this test! I was looking at the Neu vs LMT for my buggy and was a little skeptical about the Neu on the MM. This helped my decision! LMT it is!

Very nice buggy. I'll bet you will get some serious speed out of that setup. I really like your battery holder too! Is that two pieces of angled carbon fiber? I'm assuming that is either 1 inch or 1.5 inch. That is a very good way to do it. I'm converting a Jammin CRT Truggy right now, but I've been hung up on how to mount the lipo packs. The biggest problem is that the packs will hang out past the end of the chassis a little and I have to support it and also anchor the Velcro strap. I might do it the same except with aluminum.

[jhautz]

Originally Posted by Cartwheels

Very nice buggy. I'll bet you will get some serious speed out of that setup. I really like your battery holder too! Is that two pieces of angled carbon fiber? I'm assuming that is either 1 inch or 1.5 inch. That is a very good way to do it. I'm converting a Jammin CRT Truggy right now, but I've been hung up on how to mount the lipo packs. The biggest problem is that the packs will hang out past the end of the chassis a little and I have to support it and also anchor the Velcro strap. I might do it the same except with aluminum.

Thanks.:018:

Yea, its 2 pieces of 1x2 carbon fiber angle to make a channel. I find it a little easier to work with using hand tools than aluminum. A dremmel with a fiber cut off wheel and you can pretty much shape it to anything you want. I find it easier than aluminum to work with at home. CA bonds it like iron so joining pieces is pretty easy too.

Just make sure you wear a mask and don't breath the dust. Its not good for you.:020:

[coolhandcountry]

Did you drop the gearing down any with the lmt?

[jhautz]

No. Not for this test. I used 15T on both motors. But being the higher KV motor, that should have hurt thr Lehner vs the lower kv Neu.

I havent played with gearing to try an optimize it yet. Gotta get it out for more than a minute or 2 to get a feel. Also want to hook it to an eagle tree and see what happens with theamps when It coggs like that. Mys suspision is a thru the roof spike. Which would explain the burnt MMs I have read about on the board here.

[coolhandcountry]

That may have been why you had the higher temps though.
Just a consideration.

[jhautz]

Yea, Could be.

I was running the 1940/7 in an Ofna buggy for a little while w/ a Quark125 on a 16/51 gearing. It screamed and temps were fine. 16/51 and 15/46 are close to the same ratio. Thats why I choose 15T as the starting point. I estimated that if anything I would be undergeared on the Neu.

I tend to think its just the MM is a smaller controller not built to take the same kind of load as the Quark. But you are right, I probably could gear it down a bit to make it run cooler. And probably would need to on a track anyway.

I just think that motor on 5s is a little to much to be runnnig on the MM. Its going to tend to draw more than the lower Kv motor. Although, Once I start gearing the lower Kv up to get a little more speed, who knows.

There are so many variables I feel like you just need to feel you way into it for every setup. Kinda like an art rather than a science.

[jhautz]

Update:

Well The MM is dead. I plugged it up tonight with a freshly charged 5s pack and and the Neu. First pull of the throttle it cogged slightly and then all hell broke loose. Poof just like that, up in flames and smoke. I quickly unplugged the battery and the flames went out. Hope it didnt toast the Neu... That would piss me off.

Its just not cut out for 5s voltage.

Looks like I'll send it in for the $50 Gaurantee and when it comes back it will replace the 7020 in the Rusty. Man my rusty is gonna be stylin:cool:.


EDIT: Nothin I hate worse than the smell of burnt electonics..:mad:1

[mtucker]

Too bad to hear about the Mamba Max. RIP.
I guess that is the cost of living on the edge. I know some people have sucessfully run the MM on 5S Li-Po or 6S A123, but I wonder how much time they have on those setups.

4S on the MM has treated me well, of course it is rated to handle 4S and even has a LVC for 4S.
I guess a Quark 125B is up next.

How does the $50 Castle Creations guarantee work? $50 buys you a new one with the return of a smoiked MM?

Matt

[jhautz]

Originally Posted by mtucker

How does the $50 Castle Creations guarantee work? $50 buys you a new one with the return of a smoiked MM?

Matt

Quote from the 2nd to last page of the MM manual...

''Flat rate charge for non-warranty repair/repalcement (for any reason) is $50 for your Mamba Max ESC''

4s is proven stable. 5s... not so much.:005:

[rotary rocket]

Sorry to hear about your toasted MM. Gotta love the $50 warranty.

I run a Plette Max motor in my buggy, it is also a 4 pole motor. I have had NO cogging issues at all. I started with the factory default settings.

She runs on 4S, I get about 25-28 minutes out of the 8000 Mah TP packs with no cogging or thermal issues. With no fan the MM gets up to about 150, with a fan on I have not seen it go above 138.

I have even run multiple packs right after each other and the MM temps were still sub 140. I did burn out my Airtronics servo (ran over an hour straight).

Another intresting point was the center diff got to 150+ degrees also!!!

My gearing on this buggy is 11/46. I wonder if you are geared too high for the LMT?

I even ran in mud the last weekend with no issues. The buggy's weight got up to 12 lbs (with no mud she weights 9 lbs).

[neweuser]

Dude. That is tons of mud! What do you think caused the diff to get hot? I had a single speed in my maxx that tended to get on the warm side. Gear mesh perhaps?

[jhautz]

Update:

Swapped out the MM for a Quark from another model. Now it runs smooth as butter.

I also tried the Outrunner with the quark.

First off it runs very smooth on the quark. No cogging like with the MM. But the weird thing is, it runs better in the standard Inrunner mode. In outrunner mode it will only spin very slow and the amp draw spikes like crazy. So... I guess I run it in Inrunner mode (very good crazyjr, you called it on that one):dft009:

I gotta say it a little different feeling than the typical motors I'm used to. It has a little slower spool up than the inrunners. It just feels like the motor is a little flat on the very bottom and very top ends. But the mid range is exceptionally powerful for the size of the motor. At first I thought there was something wrong cuz I'm used to having the serious bottom end punch, but then once I started to get the feel for it I realized what was happening. This little motor has some serious torque. Especially in the mid range rpm. I can be cruzin at 20-25 mph and punch it just break all 4 tires loose and start sliding.

I'm not sure I'm doing a good job of explaining this, but it almost feels like a nitro when you drive it. a little slow on the bottom end as it spools up, it hits it optimal power band in the mid range and then slowly tails off at the top end. Only more powerful feeling than nitro and the spool up and top end tail off aren't as much as nitro. It kinda cool actually. I really couldn't do a ton of driving with this thing tonight, it raining, but there is a parking garage that is just down the street from me and this time of night the top 2 levels are totally empty so I use it as an indoor testing facility.:dft012:

Its supposed to rain the next couple days (thats better than snow:018: ) and then Xmas so it will probably be next week before I get to do any more testing.

At this point, I can say Its different, but intriguing. I want to play with the gearing on this a little. I may have had it slightly over geared and that exaggerated the feeling.

EDIT: Oh yea... And the motor brakes absolutly suck with the outrunner motor. I think its cuz the motor itself has so much rotating mass that between that and the weigh of the buggy, it really takes more to stop it all. I normally run my quark with the brakes set to soft, but I think I may have to raise that up a little with this motor.

Any more testing with the outrunner yet? Can't wait to hear how the little motor does!:027:

[Serum]

Don't expect too much of it. An outrunner is not suited for the constant variety in RPM's a car puts it thru. the moving mass is simple too far away from the center and the wires are relative thin.

Far from ideal.