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  #1  
Old 07-20-2016, 10:41 AM
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Default 3:1 Planetary Reduction

I bought one of these off eBay, haven't done any testing with it or anything but seems like a nice reduction if anybody is looking for one. It is a planetary vs the spur design offered by RC4WD. $20.00 plus shipping.




http://www.ebay.com/itm/Xtra-Speed-3...wAAOSw7FRWVSfv
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Old 07-20-2016, 11:29 AM
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Default Re: 3:1 Planetary Reduction

What's the difference between a planteary and
D spur??
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Old 07-20-2016, 11:54 AM
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Default Re: 3:1 Planetary Reduction

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Originally Posted by bigford View Post
What's the difference between a planteary and
D spur??
Spur gear is like this;


Planetary is like this;

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Old 07-20-2016, 12:20 PM
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Default Re: 3:1 Planetary Reduction

10-4
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Old 07-20-2016, 12:52 PM
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Default Re: 3:1 Planetary Reduction

Don't stare at the planetary animation too long Mark. You'll end up like RW.
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Old 07-20-2016, 02:07 PM
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Default Re: 3:1 Planetary Reduction

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Don't stare at the planetary animation too long Mark. You'll end up like RW.



Reg didn't that KW you and the wife were playing with have planetaries in the rear?

Last edited by TRUCKMAKER; 07-20-2016 at 02:09 PM.
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Old 07-20-2016, 02:14 PM
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Default Re: 3:1 Planetary Reduction

Must obey the sun gear...
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Old 07-20-2016, 02:15 PM
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Default Re: 3:1 Planetary Reduction

Cool unit, maybe I will try to order few to try. 3:1 is not much, and I dont like the fact it goes directly on the motor, as it puts more torque on gears inside tamiya 3speed.
But i would like to have few sets of this gears to combine and make a bigger reduction or a nice planetary 2 speed gearbox!
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Old 07-20-2016, 02:38 PM
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Default Re: 3:1 Planetary Reduction

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Originally Posted by TRUCKMAKER View Post



Reg didn't that KW you and the wife were playing with have planetaries in the rear?
Leave my wife's rear out of this.
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Old 07-20-2016, 03:48 PM
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Default Re: 3:1 Planetary Reduction

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Leave my wife's rear out of this.
Well ok but you didn't answer my question.
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Old 07-20-2016, 04:30 PM
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Default Re: 3:1 Planetary Reduction

That real Hayes HDX? https://www.youtube.com/watch?v=AWoqq61WXGg This? If so, yes. 91000 Clark rears.
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Old 07-20-2016, 04:41 PM
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Default Re: 3:1 Planetary Reduction

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Originally Posted by RCP57 View Post
That real Hayes HDX? https://www.youtube.com/watch?v=AWoqq61WXGg This? If so, yes. 91000 Clark rears.
Yes, thanks that's the one. All I could think of was your big KW and was at work, didn't have time to search.
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Old 07-20-2016, 07:09 PM
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Default Re: 3:1 Planetary Reduction

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Originally Posted by TRUCKMAKER View Post
Yes, thanks that's the one. All I could think of was your big KW and was at work, didn't have time to search.
The KW would run the same diffs as the HDX in real life. Clark BD91000 or BD121000. Some of the trucks had Rockwell SPR570 axles but they were not common.
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Old 03-06-2017, 01:27 AM
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Default Re: 3:1 Planetary Reduction

got 1 of these a few weeks ago, very simple to add on and produced nice amount of torque. Im getting alot better acceleration now and driving off road dosen't even slow it down

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