1/8 Buggy w/ a Outrunner Motor

[rchippie]

I really like your buggy, have you had a chance to race it yet ?.

[Sylvester]

Very nice man! I was wondering.. where did you get that fan for the MM? I would kill for one of those :)

[jhautz]

Originally Posted by Sylvester

Very nice man! I was wondering.. where did you get that fan for the MM? I would kill for one of those :)

No Need to Kill anyone.:005:
http://www.allelectronics.com/cgi-bi...LING_FAN_.html

[Sylvester]

Thanks - hows the shipping with those guys?

[jhautz]

Originally Posted by rchippie

I really like your buggy, have you had a chance to race it yet ?.

No, Its not even done yet.:005: Still need to make a battery tray and get a few other things taken care of before its RTR. Probably a few more weeks. I'll see about getting it out to the indoor track in January probably.

[jhautz]

Originally Posted by Sylvester

Thanks - hows the shipping with those guys?

I think it was $5 or so. Kinda sucks to pay $5 shipping for a $4.50 item. So I ordered it w/ a few other things I needed.

[Sylvester]

I am gonna get 2 of these just in case somthing happens to one. thanks BTW, what screws did you use to keep the fan in the MM esc?

[jhautz]

Originally Posted by Sylvester

I am gonna get 2 of these just in case somthing happens to one. thanks BTW, what screws did you use to keep the fan in the MM esc?

just used some self tapping 3mm screws I had. they grabbed perfectly in between the fins on the heatsink.

I bought 2 of them too.

[Sylvester]

3mm screws .. gotcha . thanks.

[jhautz]

a little update...

Got it set up for a test run, The battery box isnt finished yet but everything else is. so I just took the pack and strapped it in with some velcro straps and gave it a quick test run up and down the street. Nothing major. I used a half charged 5s lipo just to give it a little safety margin for the first run.

Some observations from the first run.

The outrunner motor with the Mamba Maxx is all but useless. It coggs so badly that i can barly even get it to move. When it cogged I let off the throttle IMEADIATELY. I read the horror stories of the Mamba max on 5s melting down under cogging conditions. I think this is just a compatabiltiy issue with the mamba and the multi pole motor. (Just like CC told me it would have) Cogging caused the motor to get very hot, very quickly, the mamba didn't seem to generate much heat though. Hopefully the software update from CC will fix this when it comes out. If I gave it a push so it was rolling then it would go and had really good power for such a small motor. from the rolling start it would break all 4 tires loose and start sliding sideways.

Next I swapped out the motor for my Neu 1515-2.5D(1700kv). This ran MUCH better. Still had some slight cogging issues, but as long as I didnt just punch it from a standing start it was fine. Just needed to roll on the throttle and all was good. I must say Im pretty impressed that this little controller can handle the big motor as well as it does. It took 4 or 5 full throttle runns down the street and when I brought it back in it was barley warm. So far so good.:018:

Something I did observe with the Neu/Mamba, when I did try punching it from a stand still a couple times. Once it cogged so badly it actually jumped backwards 3 feet or so. :dft002: That freaked me out and I decided standing starts at WOT are not a good idea.

So for now I am going to finish this thing and then start testing with the Neu. I might try my Lehner 1940 in it and see if that motor will run cogg free. CC also told me that that the Lehners were very close to thier motors and would probbaly runn better than a Neu untill the update comes out. Problem is, its a 2200kv motor and just a little to hot for my comfort on 1/10 ESC. Thats the motor that was pulling 130A from the chart below. So its not really a good long term solution for me. Just an experiment to see if the 2 pole runs beter than the 4 pole on the MM.

I am not going to give up on the Cyclon outrunner. When the thing ran... it was pretty damn impressive I gotta say. When I get a chance Ill drop it into my emaxx and test it with the a Quark controller. I'm betting it will be much better cuz Quarks handle the muti pole motors with no issues. (and an email from Cyclon actually recomended this controller) I'll follow up with a post with these test results when I get around to trying it.

I gotta say, Even though some of you have tested it and swer by it, I had my doubts as to if the MM would be able to work in an application like this. But so far it looks lke it could be viable. Won't know for sure though untill I get it completely finished and really see what it can do.

[BrianG]

Good test! I bet that outrunner would work a lot better with a different controller like the Quark since it specfically has an outrunner mode. Maybe an MM update will fix that.

I am curious to hear about the performance and thermal characteristics of the LMT with the MM.

[crazyjr]

With a max of 40,000 rpm's he might have to leave it in inrunner mode

[mtucker]

Interesting info in the update.

I am curious what Mamba Max settings you are running with the Neu 1515?

I see a little cogging with my 1512, but not too bad. I run with these settings.
Punch = 30
Timing = Normal
Start Power = Medium

Matt

[jhautz]

Originally Posted by mtucker

Interesting info in the update.

I am curious what Mamba Max settings you are running with the Neu 1515?

I see a little cogging with my 1512, but not too bad. I run with these settings.
Punch = 30
Timing = Normal
Start Power = Medium

Matt

So far defailt settings. i havent even messed with that yet. You are right though. Making some adjustments might help. Ill see if I can make any improvements next time.

[jhautz]

Another Short Update...

A little more testing of the Mamba Max with both the Neu and the Lehner motors. Lets just say the Mamba Max in its current state is not suitable for running a 4 pole motor. IMO

Take a look at this vid clip I put together of my little experiment.

The first part its set up with the Neu 1515 and 5s. Standing start full throttle acceleration. It coggs like crazy 2 times in a row, then with slow aceleration it starts no problem.

2nd part is with a Lehner 1940 in it. You will see no problem at all with a hard full throttle start. Starts right up and just spins the wheels.

Both setups are using the exact same everything including pinion size. Only difference is the motor. This is just a short little clip shot inside to demonstrate what I was seeing. I saw the same thing outside.

http://s66.photobucket.com/albums/h2...v?t=1166497295

Once the Neu started it ran like a champ and the esc ran much cooler than with the Lehner. Thats cuz its only a 1700kv motor vs the Lehner which is 2200kv. If CC can get the start up isssues fixed with the 4 pole motors this can be a really sweet low cost esc. I didn't see any other problems with it. I tried playing with the timing and start power, but nothing really made a difference on how it started with the Neu.

Now I'm kinda stuck. Can't run the Lehner I have cuz its way to hot of a motor and will fry the Mamba in no time. It got really hot running the Lehner in just a matter of 1 minute and I can't run the outrunner that I originally planned to run with it cuz it will not start without a push. So my only real option is the Neu and I'll just have to take care not to start to quickly from a stand still.

I really hope that CC comes out with their software update for this thing pretty soon. If it fixes the cogging problem Im seeing with multi pole motors, then it could be the greatest bargain in brushless. It could be that I'm just spoiled by how smoothly the Quark starts and runs everything. I gotta try that outrunner on the Quark next.


BTW: I know... not the best lighting, but you get the idea.

EDIT: I did se some very minor coggin with the Lener also, but nothing to worry about. Just not as smooth as the Quark. With the proper kv Lehner it could be a really good setup I think.

EDIT 2: And heres a couple pics of the finished setup. Just needs the Rx to be tied down.