Direct Drive to Diff E Revo Build

[aqwut]

98% Efficiency is beautiful.... I want one... build me one...

[ilpufxit]

I've been following this thread as I continue to experiment with my e-maxx. I'm starting to think that a centrifugal clutch might be just the answer. If the outrunner's only real problem is startup, why not let it "idle" like a nitro (just set your throttle trim up a little) and then just grab all the throttle you want to take off. If you can't really use the ESC brakes on a direct drive anyway then it seems like a natural fit, no?

[lincpimp]

Actually the esc brakes work fine on my redcat/axi setup. But the clutch idea would be nice. I am going to do a twin outrunner, twin hv85 setup. We will se how well the castle air controllers work!

[sikeston34m]

Originally Posted by lincpimp

Actually the esc brakes work fine on my redcat/axi setup. But the clutch idea would be nice. I am going to do a twin outrunner, twin hv85 setup. We will se how well the castle air controllers work!

Hi Linc,

I'm very interested in what you're getting ready to do. Please keep us posted. We need pics.

If you can swing it, go with the HV110's. I've often thought about the Castle Controllers, but the lack of reverse and suitable brakes steered me away from them.

I believe with the mechanical brake setup that you have, they will do great!

[lincpimp]

If you really wanted a clutch that could handle the torque load, a modified baja 5b clutch should be able to hand an outrunner, it seems to cope with a weedeater motor in a 20lb truck!

Any specific reason to go with the hv110 over the hv85? Do you think that I will be able to pull more than 85 amps out of those outrunner with only half the load? It will be setup for an road running, so the rear motor should not have to work as hard, less weight transfer due to lower cg and stiffer, short travel shocks.

[sikeston34m]

Originally Posted by lincpimp

If you really wanted a clutch that could handle the torque load, a modified baja 5b clutch should be able to hand an outrunner, it seems to cope with a weedeater motor in a 20lb truck!

Any specific reason to go with the hv110 over the hv85? Do you think that I will be able to pull more than 85 amps out of those outrunner with only half the load? It will be setup for an road running, so the rear motor should not have to work as hard, less weight transfer due to lower cg and stiffer, short travel shocks.

Well I'm not sure, depends on the setup. I am sure my Revo is spiking up more than 85 amps on take off. It performs much better with batteries that can deliver more current.

I like to over size in the ESC department if possible. You can't have one too large as far as ratings go.

That's going to be an awesome setup.

[lincpimp]

It should be pretty cool, would be better if this guy i know could custom wind my motors so that they have lwer internal resistance

I'll try the motors stock first and see how they perform.

I received my fan yesterday for the redcat axi and plan to do some more testing, and a new chassis layout with more permanent mounting!

[sikeston34m]

Originally Posted by ilpufxit

I've been following this thread as I continue to experiment with my e-maxx. I'm starting to think that a centrifugal clutch might be just the answer. If the outrunner's only real problem is startup, why not let it "idle" like a nitro (just set your throttle trim up a little) and then just grab all the throttle you want to take off. If you can't really use the ESC brakes on a direct drive anyway then it seems like a natural fit, no?

The problem with a clutch and this setup is, current clutch designs are up on the factory drive train where torque levels are much lower. How do we design a clutch that is inline with the shaft to handle the higher torque?

ESC brakes work fine with this setup. I've never had a problem with that aspect.

[sikeston34m]

Originally Posted by aqwut

98% Efficiency is beautiful.... I want one... build me one...

How do we figure or gauge efficiency of a motor?

Huh? What do you want? Build you what? LOL