Out runners mounted to hubs

How come nobody has done this to an RC yet? It seems like common practice on full scale rigs,and it is inherently efficient as there is no drivetrain loss and to me atleast,seems like I would be very easy to do. Just solid mount the motors to the hubs wear the bearings once were.any thoughts?

[_paralyzed_]

4x speed controls, wiring nightmare, extensive trial and error to get "gearing" right, no gearing flexibility for different tire profiles, cost.

We will get there.

Ok,forgot about the esc,is there ANY way to run multiple motors off one esc? And as for wiring it wouldn't be too awful.maybe not pretty but I think it could work. And what about planetary hubs? Could give you your gearing options right there. I agree it would be hard,but not impossible.maybe a 1/5 scale would be easier due to it's size?

[brainanator]

I saw someone on here do it to a micro T :D I think....the guy with the avatar is him holding a potato gun (or other similar styled projectile launcher)

Metallover built one? Huh,might have to look for that build.

[lincpimp]

Startup loads would be massive. Plus unsprung weight would be very high so handling would be crap. Replacing the diff would be better, but you still have the high startup load to consider. I personally like the direct to diff, ie replacing the center gearing/trans with an outrunner.

I have plans to do a dual outrunner direct to diff setup on a 1/5 scale car. I will have to use 2 esc, but I can basically mount the outrunner shaft directly to the pinion gear. So it will open up the center of the chassis to allow all of the componets (batteries, escs, etc) to be mounted right on the center line.

[brainanator]

http://www.rc-monster.com/forum/show...t=22629&page=2
yup, glad you remembered his name based on his avatar :p

[What's_nitro?]

Originally Posted by bigsteel

How come nobody has done this to an RC yet? It seems like common practice on full scale rigs,and it is inherently efficient as there is no drivetrain loss and to me atleast,seems like I would be very easy to do. Just solid mount the motors to the hubs wear the bearings once were.any thoughts?

I'm working on it.

Originally Posted by lincpimp

Startup loads would be massive. Plus unsprung weight would be very high so handling would be crap. Replacing the diff would be better, but you still have the high startup load to consider. I personally like the direct to diff, ie replacing the center gearing/trans with an outrunner.

I have plans to do a dual outrunner direct to diff setup on a 1/5 scale car. I will have to use 2 esc, but I can basically mount the outrunner shaft directly to the pinion gear. So it will open up the center of the chassis to allow all of the componets (batteries, escs, etc) to be mounted right on the center line.

Ditto on what the pimp said. I was thinking about doing something like this in a Baja but there would just be a ton of unsprung weight and it is too complicated/expensive to be worth it IMO. 4x MMM, 4x 6s Lipo, 4x Motor = $$$$. If I was to build a crawler (without any real knowledge of crawlers) I'd maybe give it a shot and have some system set up where I can power any of the wheels individually on demand, would make kind of a cool traction system.

I didn't think about how it would affect the suspension. I guess motors replacing diffs would be more practical in this application. I'm gonna draw something up on my drafting table,I've got an idea on how to gear the motors and still allow adjustment. Althoughthis makes me wonder,how well do full size supercars handle with Hub motors? The Audi r8 that was electric had like 800hp and 3000ft/lbs so it was probably negligible to the gains.