Direct Drive to Diff E Revo Build - Page 6 - RC-Monster Forums

zeropointbug · 11.16.2007, 02:30 PM

Yeah, that esc mount must suck a good amount of heat away from the esc.

sikeston34m · 11.16.2007, 02:35 PM

Quote:

Originally Posted by zeropointbug

WOW! So does it run smooth and quiet besides the minor cogging? I agree that turning it to 'outrunner' will probably treat the cogging issue. I hope you get the programming figured out..

Move throttle to 'min' position...
Turn 'on' esc switch...
Press and hold the esc program button and move the throttle to 'max' and hold..
Release the program button after 2-3 seconds...
Now move the throttle until you hear recognition beep...

You should have entered advanced programming mode... the LED pattern should be the two inside LED's (green and yellow), move the throttle to change, yada yada yada.

It runs VERY smooth and VERY quiet. The tire noise is louder than the motor unless I slip off into the grass.

It needs programming and More voltage. I'm gonna be working on those two things next.

Are these good caps? Do you know where to find the spec sheets? I tried the HO number on the nichicon website with no luck.

Mod Man · 11.16.2007, 05:47 PM

Going up in voltage may cure the cogging too. I had that issue a while back. I almost bought a different ESC untill I tried higher voltage. :)

Looks good!

Matt

suicideneil · 11.16.2007, 05:57 PM

That thing is gonna really confuse a lot of people when they see it for the first time- no visable motor!

zeropointbug · 11.16.2007, 06:38 PM

Can anyone say "perfect left-right balance"... if you lower this thing for stance a bit, it would murder at a race!

sikeston34m · 11.16.2007, 06:46 PM

Quote:

Originally Posted by zeropointbug

Can anyone say "perfect left-right balance"... if you lower this thing for stance a bit, it would murder at a race!

One thing I noticed during the 3 runs I've done today, The motor being so low acts like a balast weight. I did some high speed turns and I didn't flip this truck once today. I'm very pleased with the center of gravity.

sikeston34m · 11.16.2007, 06:59 PM

Oh No! The RCM Hybrid Diff's are out of stock!

I tried emailing about ETA but the mail bounced back because the mailbox is full.

I wonder when they will get them again?

ib4200 · 11.16.2007, 07:01 PM

Quote:

Originally Posted by suicideneil

That thing is gonna really confuse a lot of people when they see it for the first time- no visable motor!

lol yeah you should try to cover up the motor as much as possible

zeropointbug · 11.16.2007, 07:22 PM

Does the setup have enough torque to wheelies at speed? What Kv. is your motor?

So you are talking stator dimensions, not the outside dimensions, correct?

One of those Scorpions looks larger than the Axi, 40mm stator, 25mm length.

I don't know what rpm the motor is hitting, but I know an outrunner should be hitting 6500-7000rpm to get 45mph in a Revo with moderate ballooning tires.

sikeston34m · 11.16.2007, 07:43 PM

Quote:

Originally Posted by zeropointbug

Does the setup have enough torque to wheelies at speed? What Kv. is your motor?

So you are talking stator dimensions, not the outside dimensions, correct?

One of those Scorpions looks larger than the Axi, 40mm stator, 25mm length.

I don't know what rpm the motor is hitting, but I know an outrunner should be hitting 6500-7000rpm to get 45mph in a Revo with moderate ballooning tires.

No it will not wheelie. The AXI 4130/20 is 305kv. It's the largest motor that produces the most torque that will fit the space and the stock transmission output shaft.

Yes I'm talking stator dimensions.

On 6S A123, I figure I'm hitting about 5500 rpms.

zeropointbug · 11.16.2007, 09:12 PM

Okay, well how much does the motor weight?

I find that odd that it is not doing wheelies with that large motor... I think this outrunner business is going to be a little tricky at 'sorting' out what works and what doesn't.

ib4200 · 11.16.2007, 10:48 PM

just as an experiment run it on rwd to see if the less resistance makes it go a little faster

zeropointbug · 11.17.2007, 01:28 AM

you would only gain maybe 1mph? maybe ♠2?

sikeston34m · 11.17.2007, 11:29 AM

OK on to the next phase of this project. Hybrid Diffs. I can get the cases, but I have to come up with the gears.

The Hotbodies gears are compatible with the RCM Hybrid cases. In searching for parts, I found this http://www3.towerhobbies.com/cgi-bin...?&I=LXLGX2&P=7

It appears to have a 50 tooth spiral ring. Would this be compatible with the 10 tooth pinion? Here: http://www3.towerhobbies.com/cgi-bin...?&I=LXJBM3&P=7

This combination would give me 5:1 diff gear ratio which is even better IMO than the 4.3:1

With the Emaxx, from input shaft to tire the ratio's are:
1st gear: 5.62:1
2nd gear: 4.57:1

5:1 is perfect! Power it with a AXI 4120/14 at 660kv and watch it fly!

It seems there is another issue with the Hotbodies pinion. Here we have a 8mm shaft with no hole? What's the answer to this?

Maybe this? http://www3.towerhobbies.com/cgi-bin...?&I=LXFWS2&P=7

I could turn the cvd's around backwards and put the dogbone end at the diff. Are the two compatible though?

Hmmmmm.........I wonder.

lincpimp · 11.17.2007, 11:41 AM

Put this on the pinion and put the dog bone end into it. Cvd end can go on the motor shaft.

http://www3.towerhobbies.com/cgi-bin...?&I=LXJBE9&P=7

Mike sells the diff output shafts that can be used to put the stock silder style driveshafts on the hb diffs.

http://www.rc-monster.com/proddetail...d=RCMdiffshaft