Direct Drive to Diff E Revo Build - Page 16 - RC-Monster Forums

johnrobholmes · 12.14.2007, 12:25 PM

I think your idea of a ring would work well. I would use a zip tie to hold it all and solder, then take the zip tie off and epoxy the winds tight.

sikeston34m · **E maxx Video's -** 12.14.2007, 02:30 PM

I got some video's of the E maxx with the custom Wye wind.

Let me know what you guys think.

BL-Power · 12.14.2007, 03:56 PM

In, my opinion, your Maxx is very cool

It has a lot of torque and is accelerating really fast.

But i would use other tires, it looks like they are not the best ones for this type of surface....

I hope you understand my poor school english

ilpufxit · **Way cool! -** 12.14.2007, 05:04 PM

Looks great. The Maxx always was fun to drive, not too stable, but drive-over anything (almost). Check out my truggy wheels with Bowties if you want some better grip. It looks like you've got the acceleration nailed and really good control. I am so jealous of all that nice dry, snow-free ground you've got there. We have another storm on the way.

I ran my Maxx last night at an indoor track. Kept it in 1st gear and it was still too fast for the track. Really nice and driveable, smooth power, good brakes (The sound the ESC makes under braking makes me kind of nervous). No problems at all, just fun to drive. Hard to control in a small space with lots of jumps though, I had to pull it off the track after I ran over a couple 1/10ths.

From what I've seen so far, I would not hesitate to order whatever new toys Sikeston34m comes up with. When there's a direct drive that works, sign me up!!

aqwut · 10:46 PM

How do you link the video to YouTube like that...
I like the Video bro.... is that a stockie E-Maxx?...

sikeston34m · **True Direct Drive -** 12.14.2007, 11:43 PM

Now here's a project that's going to take some Engineering.

All I need is 3 more motors and figure out how to attach them to the A Arms.

This is a regular E maxx tire that is 5.75" tall.

BL_RV0 · 12.15.2007, 12:48 AM

THAT IS SO EFFIN COOL!!!!!!! steering will be an issue tho....

aqwut · 12:56 AM

LOL, is that the same motor I have Sikes?..... LOL... too bad it wouldn't work in reality.... but man.. it would be Real awesome..
you really gotta test the torque of that motor... it's cray powerful...

Matthew_Armeni · 12.15.2007, 01:18 AM

How about 2 motors, sideways between the bulkheads? Then you could attach the driveshafts to the motors. It would cause a lot less headaches design wise I think. With 4 motors being in the tires you have to worry about durability, mad unsprung weight, gyro effect, much too difficult. Maybe for a large scale onroad though.

sikeston34m · 12.15.2007, 01:18 AM

Quote:

Originally Posted by aqwut

LOL, is that the same motor I have Sikes?..... LOL... too bad it wouldn't work in reality.... but man.. it would be Real awesome..
you really gotta test the torque of that motor... it's cray powerful...

Yes I believe it is the same one you have. I had to get me one too.

I'm not so sure this wouldn't work. It would be a very heavy and expensive setup though. Not to mention that it would use 14 pounds of motors.

But a cumulative Wattage output of 28,000 watts should be enough to justify some of that weight. LMAO

I have test ran it in my hand on 4S Lipo. It was all I could do just to hang onto it, and that's spinning it really slow.

What have you tried it on so far? I'm thinking an Electric Bicycle that will carry me around.

ilpufxit · **Two words -** 12.15.2007, 10:18 AM

Unsprung weight.

aqwut · 12.15.2007, 11:20 AM

have one in my BlackJack 55" Cat boat (Currently Being Re-Painted)... planning to put another one on another GST 7.7 Roller... I almost have enough parts to build 2 more GST Rollers... but I'll need to get my hands on another 40.160WK.. I'd rather wait until Lutach over there get's that Custom HV ESC made...

sikeston34m · 12.15.2007, 12:38 PM

Quote:

Originally Posted by aqwut

have one in my BlackJack 55" Cat boat (Currently Being Re-Painted)... planning to put another one on another GST 7.7 Roller... I almost have enough parts to build 2 more GST Rollers... but I'll need to get my hands on another 40.160WK.. I'd rather wait until Lutach over there get's that Custom HV ESC made...

I have a feeling what you will run into on the GST conversion is issues with building diffs that will hold up to that kind of power.

Get us some vids of the boat and the GST if you can. Can you actually get a prop for the boat large enough to make use of the torque this thing can make?

Unsprung weight. Let's talk about that. A Motor in each wheel setup would have a center of gravity that would be unbeatable. The bearings in this motor are HUGE and appear to be up to a good amount of abuse. Not only that, the power isn't even being transferred through the output shaft anymore. The output shafts new job would be to just hold everything and keep it spinning true. It's now an "axle shaft" more or less.

With advanced Electronics and programming, we will have independant traction control. A slipperential would be a matter of programming. So would "diff slip".

Diff slip would be a matter of limiting amp draw based on steering angle. An ESC controlling this would become more of a PLC.

I really look for this to become a reality with full scale on road Electric Cars in the future.

The drive motors will be sensor based to smooth things out and completely eliminate cogging and erratic behavior.

No drive train! Can there be a more efficient way? How about one that's going to hold up longer? About the only "wear item" in this is the bearings in the motor.

ilpufxit · **Unsprung weight -** 12.15.2007, 12:51 PM

For a crawler, you're absolutely right, keep the cg low. For speed though, your suspension can't keep that much weight on the ground going over bumps, too much momentum. Could work well on a totally smooth surface.

I like the idea of motors where the diffs go, 2 motors opens up a whole range of control options.

sikeston34m · 12.15.2007, 12:59 PM

Quote:

Originally Posted by ilpufxit

For a crawler, you're absolutely right, keep the cg low. For speed though, your suspension can't keep that much weight on the ground going over bumps, too much momentum. Could work well on a totally smooth surface.

I like the idea of motors where the diffs go, 2 motors opens up a whole range of control options.

Aaaah, I see your point. On road would be alot different and would work much better.

I like the idea of putting motors where the diffs go also. Aside from redesigning the bulks to hold them, this is going to be like running locked diffs in the front and rear.

How do we use front and rear motors, and retain our diff slip?

We've talked about an inline with the shaft slipper clutch here several times. How about instead have a centrifigal clutch in the wheel hub? The hub would have to spin up some before it would gradually apply torque to the wheel rim. Let's make this run on a large one-way bearing so when we put on the brakes, it will stop.

This setup would only "cushion" in forward, but who runs races in reverse?