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sikeston34m · 11:35 PM

Hi Guys,

Always glad to lend a hand when I can.

Here's some reference material. http://www.rc-monster.com/forum/show...ect+drive+diff

Am I still using the outrunner in my truck? No, but I still have all the parts here.

I ran into two problems with the direct drive to diff setup:

#1. 4.6:1 final diff drive ratio gears would NOT hold up to the torque being made. The diffs use ball bearings not thrust bearings on the pinion gear. I could trash the pinion bearings in less than one packs runtime. Yes, they were shimmed properly. It would always punch the center race right through the outer race. Little balls everywhere. LOL

#2. In an effort to get the kind of speed/power I wanted, a custom wound outrunner was created. An AXI 4130 was made into a 4 turn motor. Hot Thing! but would pull HUGE amp spikes on startup.

It still wasn't too shabby:

http://www.youtube.com/watch?v=dFDrYXLkcGg

Check out the video, then ask yourself if this has "spool up" problems.

Spool up time is required or negated by final drive ratio. It all depends on how much torque the motor makes. High Revving motors use very low gearing to make up for their lack of torque. The same applies in reverse for outrunners.

How do you plan on gearing your setup Seth? And what voltage do you plan on running?

	(#18)
sikeston34m RC-Monster Brushless Offline Posts: 2,085 Join Date: Sep 2007	08.29.2009, 11:33 PM Hi Guys, Always glad to lend a hand when I can. Here's some reference material. http://www.rc-monster.com/forum/show...ect+drive+diff Am I still using the outrunner in my truck? No, but I still have all the parts here. I ran into two problems with the direct drive to diff setup: #1. 4.6:1 final diff drive ratio gears would NOT hold up to the torque being made. The diffs use ball bearings not thrust bearings on the pinion gear. I could trash the pinion bearings in less than one packs runtime. Yes, they were shimmed properly. It would always punch the center race right through the outer race. Little balls everywhere. LOL #2. In an effort to get the kind of speed/power I wanted, a custom wound outrunner was created. An AXI 4130 was made into a 4 turn motor. Hot Thing! but would pull HUGE amp spikes on startup. It still wasn't too shabby: http://www.youtube.com/watch?v=dFDrYXLkcGg Check out the video, then ask yourself if this has "spool up" problems. Spool up time is required or negated by final drive ratio. It all depends on how much torque the motor makes. High Revving motors use very low gearing to make up for their lack of torque. The same applies in reverse for outrunners. How do you plan on gearing your setup Seth? And what voltage do you plan on running? Last edited by sikeston34m; 08.29.2009 at 11:35 PM.