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| Big spur vs small spur https://setup.teamxray.com/xsetup/legacy/viewtopic.php?f=8&t=13595 |
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| Author: | YELLOWSHARK [ Mon Jul 08, 2013 18:59:49 ] |
| Post subject: | Big spur vs small spur |
To get a particular FDR you can for example use a small spur or a large spur. I recall reading an article some years back on the pros and cons of smaller spurs vs larger spurs but it has not been retained in my memory banks. Is one better than the other? |
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| Author: | beale [ Mon Jul 08, 2013 23:35:44 ] |
| Post subject: | Re: Big spur vs small spur |
A larger Spur is always going to be slower but less strain on the drive ( less heat) |
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| Author: | YELLOWSHARK [ Tue Jul 09, 2013 01:20:13 ] |
| Post subject: | Re: Big spur vs small spur |
Do you know why that is? Also when you say slower do you mean acceleration or top speed or both? |
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| Author: | beale [ Tue Jul 09, 2013 06:58:36 ] |
| Post subject: | Re: Big spur vs small spur |
More Spur (driven) teeth longer distance to travel but greater acceleration. Bicycle gearing always springs to mind when talking acceleration/top speed. If you try to start in the lowest gearing it's hard work so you use higher gearing to improve acceleration but rather than pedal like mad you change gears |
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| Author: | Matt W [ Tue Jul 09, 2013 12:47:22 ] |
| Post subject: | Re: Big spur vs small spur |
Im running in the 17.5 blinky class. Would 64dp be any better than 48dp when it comes to acceleration and speed? |
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| Author: | beale [ Tue Jul 09, 2013 21:54:54 ] |
| Post subject: | Re: Big spur vs small spur |
Admittedly more teeth but as they are smaller there is less theoretical resistance (quieter) but the difference for most is negligible, but it does give a lot more options |
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| Author: | Matt W [ Wed Jul 10, 2013 21:22:51 ] |
| Post subject: | Re: Big spur vs small spur |
Ive heard that you get better acceleration and pull out of a corner with 64dp over 48dp, is there any truth to this? |
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| Author: | beale [ Wed Jul 10, 2013 23:25:07 ] |
| Post subject: | Re: Big spur vs small spur |
No truth other than the less resistance thing. it's all about effective diameters that is why there is conversions from 48 to 64dp, the overall diameters can be the same with an entirely different tooth count, I had all the conversions in an old phone for working out rollout on foams just look at the Xray gear charts they show FDR's for 48 and 64 working on the same effective diameters Calculation is the same (Spur \ pinion)*internal(1.9)=FDR |
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