Found something intresting on Ebay - RC-Monster Forums

crazyjr · **Found something intresting on Ebay -** 04.02.2007, 01:29 AM

Here is an intresting tranny motor setup I found on EBay http://cgi.ebay.com/New-E-maxx-Brush...QQcmdZViewItem it looks to be set up nice, not sure about the lack of slipper. There is a few video's on the link. I would like some opinions, because i think it would be a cool racing combo on 4s lipo in the G2R

zeropointbug · 04.02.2007, 01:58 AM

Looks like an outrunner running directly into the tranny. You won't have much gearing choices (NONE), and you don't really know how it will perform, either torque, or top speed.

I have always wanted to use outrunners, however, i think they should be used without a tranny, and if it's possible without diffs (1 motor per wheel) for true transmission-less operation.

If these outrunner's were efficient enough, like 92%, that would make a very efficient setup.

Eventually we will have motors right inside the wheels.

To cut to the chase, I wouldn't bother with it... IMO

sleebus.jones · 04.02.2007, 03:37 AM

Looks good to me. Appears to have plenty of power and speed. Being able to use a quark 80 is nice, a bit cheaper, but you're still looking at $400 + batteries to make it all work.

Sleeb

jhautz · 04.02.2007, 08:12 AM

http://www.rc-monster.com/forum/showthread.php?t=5991

I saw this a couple weeks ago. Was wondering how it would perform myself. Looks interesting at the least. The biggest issue I see is if you need to vary gearing for any reason, the only options you have is to change the motor for a different kv or go with different size tires.

It appears to run decent in the video, but somehow it just looks a litlle hokey to me. If you decide to give it a try let us know how it works for you. I'd for sure be interested to hear about it.

Serum · 04.02.2007, 12:20 PM

Outrunners and cars don't go hand in hand.

It's easier to use a smaller rotor to spin up/down/up/down/up/down/up/down than a larger outrunner.

That plus the weight of the rotor and the missing slipper.. It's asking for trouble. hard on your controller/drivetrain.

neweuser · 04.02.2007, 12:59 PM

I agree with Serum. The pain on the drive train would defiantely catch up with everything, and for 200.00? I would think you would be happier with a MM and xl motor to say the least.

Gustav · 04.02.2007, 01:14 PM

Interesting but not a good idea if you ask me.the slipper isn't just needed to protect the spur and pinion like he seems to suggest.

crazyjr · 04.02.2007, 01:25 PM

Thanks for thr input, from what i could see you could adjust with batteries (speedwise), but that could be expensive

hyperasus · 07:52 PM

I can't see any kind car/truck working without a slipper or some kind of clutch. There's just no way. On an airplane...yeah. On a vehicle with 4 wheels...not a chance in hell. Even if this trany/motor combo holds up like the seller claims, the drive shafts and differential gears wont stand a chance. My guess is this seller drives his truck in a parking lot. Give that trany to me and I'd have it gutted within minutes in my off road bashing pit. One good jump and that sucker would be toast.

zeropointbug · 04.03.2007, 07:58 PM

It would work if you got rid of ALL transmission components, and had a motor per wheel, running direct drive. You would need smaller, higher torque ones. Something like 20 poler, ran by smaller esc's, but i would think there would need to SOME communication between each controller to make it track straight...

IMO

hyperasus · 04.03.2007, 10:42 PM

Quote:

Originally Posted by zeropointbug

It would work if you got rid of ALL transmission components, and had a motor per wheel, running direct drive. You would need smaller, higher torque ones. Something like 20 poler, ran by smaller esc's, but i would think there would need to SOME communication between each controller to make it track straight...

IMO

Yeah. Something like a Pentium 4 to take care of the traction control. It's a pipe dream. At least it is for an RC. A real car that has all 4 wheels planted on the ground at all times and isn't quite so off road performance based would be more doable.

zeropointbug · 04.03.2007, 10:50 PM

I just meant for keeping the same motor frequency, they just have to be synced is al. But, simply doing the throttle travel programming together is prob good enough anyways, i would think?

Serum · 04.04.2007, 01:56 AM

I thought about this; with active suspension, and every wheel powered independent, with the right software it would be a dream to handle.

zeropointbug · 04.04.2007, 03:27 AM

Well $H!T yah! It would be like limited slip diffs, only more natural feel i would think. It would also be near silent operation... that's neither a good or bad thing.

Do you think it would need some kind of controller that could keep teh front and rear same speeds, not synced, but like a center diff, just very stiff.

Some day, some day!

neweuser · 04.04.2007, 09:46 AM

Quote:

Originally Posted by Serum

I thought about this; with active suspension, and every wheel powered independent, with the right software it would be a dream to handle.

I think the idea as a whole is good. But having independent motors on each wheel would get spendy the maintain. When I drove electric fork lifts, they were powered similar to your idea. The motors however took a beating, that is for sure. Although they carried more weight of course. But RC's would require smaller motors to power each wheel, this would add some weight as well as a suspension that could also work and handle it as well, and would also add some weight. I would think the motors would eventually wear at different times and end up getting costly and a PITA to repair. yes it would handle like a dream, but at what cost?