1/8 Buggy w/ a Outrunner Motor

[jhautz]

Originally Posted by Cheater

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

I havent spent any time running the buggy on the outrunner since the last testing. I have been running it on a Quark 80 and a Neu 1515/2.5D. I took it up to the local track and ran a few packs thought it. No problems with the motor ESC combo. Actually ran very cool. (of course it was only 45 degrees) But no heat isses at all. I was just testing out the rest of the build and seing how it all held up and handled. With the holidays and all I havent had much chance on the weekends to get out and run it again.

I wound up spending the last couple weeks revising some of my mounting. The esc mount I put in to test the Quark 80B wasnt quite up to snuff and I needed to make an aluminum and CF mount that would be more permanant than the zip ties I was using before taking it out again.

All in all It ran nice on the track. Needed to make some setup changes. I was running to stiff on the springs and shock oil so I lightened them up. Hopefully this help handleing the bumpy stuff. Flew straight and it was really fast. Had a small crowd around it in the pit. They acted like the had never seen a brushless 1/8 (they hadn't :D ) Then when it ran I had quite an audience. Thats when it really sucks to be as bad a driver as I am. Quite embarasing.:dft001:
Had one of the local hot shot drivers offer me $1000 for it on the spot. I told him that 1000 wouldnt cover it. But I would help him build one if he wanted to. (doing my part to suck more people in):018:
Next time I run I will test it with the outrunner again to see how she runs on the track. Hopefully in the next couple weeks. I've been more worried about the mounting and chassis setup to this point.

Originally Posted by 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.

Actually Serum, the little that I did run it I was surprised at how good it felt and the power it generated. Like I said. A little different feeling with slower spool up, and weak motor braking, but good enough that I am interested to see what it does on a track.

There was another guy there that was running the Cyclon Car 5000 outrunner motor on the Quark 65 in his T4. He liked it. He said it had nice feel and smoother power than the other brushless motors he was running.


Side note: Sent the burnt MM in to CC just before X-mas per their customer service department directions. Still havent heard anything from them. Hopefully soon.

[crazyjr]

By Jhautz: guess I run it in Inrunner mode (very good crazyjr, you called it on that one)
z:

Just a suggestion based on the rpm limits, I know that the outrunners run like a 4 stroke (on a different rpm scale) but these are a little different. I'm thinking about trying these on my local track

I wouldn't expect it to be as strong as some of the more commonly used motors. According to tower hobbies site this thing only weighs 5.6 oz.. My M.M. 5700 is closer to 6.5 oz. If 5.6 is correct, and it has enough power for on the track that would be great!:027:

[jhautz]

I did get a little more testing done this week with the outrunner. I ran 2 more packs with it and 2 more packs with the Neu 1515/2.5D. All in all it ran pretty well on the outrunner, but it didn't quite have the snap and responsiveness of the neu. The spool up made it feel a little sluggish on the bottom end. I think I am going to wind up sticking with the Neu and the Quark 80B as the final setup.

I forgot my eagletree but using my Watts Up meter I saw amp spikes of around 120A on the Outrunner motor and around 112A on the Neu. I'm kinda surprised that the outrunner was drawing more considering how much bigger the neu motor is.

I also made a few changes to the setup to accommodate the Quark. I made an ESC mount/heatsink out of aluminum L stock and put a haetsink on the side with a small fan. Seems to work fine, but when is 40 degrees outside anything stays cool. We'll see this summer I guess.

Anyway... Heres a few photos of its final (for now) form.

[BrianG]

Pretty sweet!

You must have been anticipating using some rather large pinion/spur combos judging by the length of the adjustment slots on the motor mount!

[jhautz]

It was actually a mistake part that was left over from my XLB project. :rolleyes: The XLB Runs a 65T spur so It needed a little longer mount. I was able to salvage it and make it work for this application. Your right, Its way longer than I need, but I already had it. I just needed to drill a couple screw holes into it for mounting and I was done. So I took the lazy route rather than starting from scratch again.

[BrianG]

Lol, that makes sense. I just thought you got carried away with making the slots. :)

BTW: I don't like the term "lazy". I prefer "efficient". :)

[coolhandcountry]

Cool. How was the torque of the out runner to the neu though?

[Sylvester]

Very nice work jhautz! Looks like it can whip the crap out of a nitro ! Than again almost any bl will do that. ;)

[Mike.L]

yeah it looks nice!

[jhautz]

Originally Posted by coolhandcountry

Cool. How was the torque of the out runner to the neu though?

The torque was fine, but on the bottom end it took so long to spool up it felt like there wanst enough snap. It felt like a nitro where when I punched the throttle from a standstill or slow roll it kinda felt like it bogged down and didnt really take off like I expect from brushless.

I tryed a few different pinion sizes and it didnt seem to make much difference in the end all it did was effect the top speed, not really much difference in the bottom end.

Mid range was just a powerfull feeling as the neu, if not even more. so no issues there. Starscreams clutch system hess using in his 8ight migh be a potential solution. Although, it actually feels like there is a clutch on it.

[MetalMan]

Do you think using a different size outrunner might affect the "snap"?

[jhautz]

possibly.... But this is the only size that I found that is 40K rpm capable. All the others are like 10K rpm motors.

[BrianG]

The fact that they made is capable of 40k rpm, yet is actually quite small physically may have something to do with the performance. Kinda like trying to use an S size motor on something large - it will work (and be hot), but will struggle a bit and suck some serious current to do it.

I wonder if using a typical 10k outrunner and gearing appropriately will work much better?

[Sylvester]

It could possibly work better, but, how are you gonna gear and get the voltage to run near that 10K... Somthing maybe leroy should try;)