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Old 10-18-2016, 02:29 AM   #16
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I'm not sure there will be much to gain in efficiency but I suspect drivability might be improved particularly in mod, with less kickback in the belt. Looking at the chassis it looks like there are options to swap the motor / belt / battery layout and support shorty packs.

Can't wait to convert my existing S4's.
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Old 10-18-2016, 07:05 AM   #17
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What a missed opportunity.

The belt should run down the middle, the motor centred with the tension run going under and the slack run going over.

And they still cut battery tape slots.

Well, at least this leaves scope for me to finish my design.
When you finish your design. I'd like to see the pics. And if you don't mind, on track performance video without video editing
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Old 10-18-2016, 07:50 AM   #18
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Quote:
Originally Posted by vr01 View Post
I'm not sure there will be much to gain in efficiency but I suspect drivability might be improved particularly in mod, with less kickback in the belt. Looking at the chassis it looks like there are options to swap the motor / belt / battery layout and support shorty packs.

Can't wait to convert my existing S4's.
When running Mod you typically want different belt tensions between the front and rear belts (front tighter than rear), can't see how you could do with with a single belt unless you're using tensioners, which adds even more loss to the drivetrain.
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Old 10-18-2016, 07:52 AM   #19
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Not sure how the motor can be centered unless you design the car around shorty packs. Then you have the design challenges of a belt that goes over and under the motor.
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Old 10-18-2016, 08:42 AM   #20
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... Losi XXXS... but better ;-/???
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Old 10-18-2016, 09:03 AM   #21
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My design has the lower run (the tension run) IN the chassis bottom plate. The plate is cut longitudinally all the way between the front and rear pulley.

That is so I can centralise motor, battery, steering servo.

The return (slack) runs above the motor, hopefully very low so the CG doesn't suffer that much.

I am not sure about efficiency dis/advantages, but I would say what you want is to try to eek enough advantage from having a virtually perfectly symmetric chassis (weight distribution and torsional rigidity) to offset any potential disadvantage in efficiency, higher CG, etc.

Not sure if this idea is going to revolutionise TC (most likely not), but it is what I am interested in.

Juan, you'll have a long wait to see a video. I don't have the time or machinnery to cut chassies, CNC, etc. I was hoping some smart cookie (big company, hint, hint) was going to do something like this, or at least come up with a perfectly symmetric bottom chassis so I can use that as a test mule before I drop serious money in it.
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Old 10-18-2016, 09:16 PM   #22
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Getting by the conversion tomorrow. Should have it ready for the Fresno race
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Old 10-19-2016, 04:34 AM   #23
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Getting by the conversion tomorrow. Should have it ready for the Fresno race
Juan,

Do you know of a place or somebody who may have a copy of the instructions, like a .pdf or something. Would love to see a bit more on this. Thanks
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Old 10-19-2016, 05:16 AM   #24
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Looks like Losi had it right 12 years ago. Just didn't execute the rest as well. Original HPI RS4 had a centered motor and battery (transverse).
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Old 10-19-2016, 06:40 AM   #25
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Corrallyman- I don't. My guess is that the instructions will be 1 page or so. It's jus a conversion
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Old 10-19-2016, 07:53 AM   #26
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Looks like Losi had it right 12 years ago. Just didn't execute the rest as well. Original HPI RS4 had a centered motor and battery (transverse).
I think you mean 'also did it this way', not 'had it right 12 years ago'
Whether this design works with the modern high torque motors etc, and the greater power levels we have now, remains to be seen.
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Old 10-19-2016, 09:00 AM   #27
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I do like the simplicity of the design but we'll see performance wise.
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Old 10-19-2016, 09:48 AM   #28
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Interesting concept, but I really don't get it. One less drive pulley, but have to add an idler pulley. One less belt, but the one belt is much longer. I don't see an efficiency gain, maybe an efficiency hit because of the idler pulley drag. All this to get rid of a small belt, doesn't add up. Looks to me like someone did it just to do it.
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Old 10-19-2016, 11:10 AM   #29
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Originally Posted by glennhl View Post
Interesting concept, but I really don't get it. One less drive pulley, but have to add an idler pulley. One less belt, but the one belt is much longer. I don't see an efficiency gain, maybe an efficiency hit because of the idler pulley drag. All this to get rid of a small belt, doesn't add up. Looks to me like someone did it just to do it.
About sums it up
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Old 10-19-2016, 12:00 PM   #30
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Quote:
Originally Posted by Skiddins View Post
I think you mean 'also did it this way', not 'had it right 12 years ago'
Whether this design works with the modern high torque motors etc, and the greater power levels we have now, remains to be seen.
Maybe I should have said marketed it first. It was a pia to assemble but easy to adjust tension and pinion mesh. I still have one setting in my basement.
RS4 was a two belt car just to mention that.
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