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Thread: Twin hammers gearing question

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Old 07-27-2016, 04:55 AM   #1
Join Date: Dec 2015
Location: UK
Posts: 16
Default Twin hammers gearing question

I have a brushed 35t motor and need to know the best gearing for it to use mainly for crawling but also give it a little speed when needed? Currently looking at the Robinsons hardened spur gears with either 78T or 87T but which size pinion should I be looking for? Not going to use brushless motor so please dont recommend a change to this.
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Old 07-31-2016, 12:21 AM   #2
Rock Stacker
Join Date: May 2015
Location: North Lakes, QLD
Posts: 79
Default Re: Twin hammers gearing question

R/C Calculations

Twin Hammers Gear Chart

Using those two you can work things backward from the top speed you are after.

I have a 35t pinion but you can't fit the spur cover on if you use it. 27t + 78t spur is probably a good fit for your high turn motor. 2s or 3s?
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Old 08-01-2016, 07:28 AM   #3
I wanna be Dave
Join Date: Aug 2004
Location: central VT
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Default Re: Twin hammers gearing question

If you mainly want to crawl then I'd try a 25 tooth pinion to start. This should give you plenty of crawlibility with a 35T. If you need more speed then step up to a 27 or 28.
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