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ac hauswald -> RE: home made project pics, gearing question (12/21/2007 6:38:40 PM)
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Hey vdubsport,
I run 48p gears. HPI spurs worked best for me. Robinson Racing Products aluminum pinions. 64p will offer more gearing options, but the 48p seem stronger for RC drag racing applications. "Most" of the cars competitng use 48p.
I'd say 48p is good for E.T.'s down to around 1.9sec. Below that they are strained. I base that comment on the fact that "many" Top Fuel electric cars use a spur gear a run (!). Yeah, you read right. Gets kinda expensive to use 48p in the 1.67sec range. That's the current IMDRA TFE record.
FWIW, I'm gearing my TFE using 32p. Limited gearing options and steel (!heavy!) pinions. "Most" of the Extreme Class cars are going to 32p-at least here in Texas. For your application, again, I'd recommend 48p.
Gearing? The way I do it is to gear to the national record and adjust from there. Example, current TFE mph record is 74.9mph. I back-plan my gearing from that speed. That is my starting point for gearing. As far as your application, I hesitate to hazard a guess. When I first began RC drag racing, I set my car up by marking off a 132ft course and using a Venom Speed Meter (VSM) to gear for max speed. The speed read-out doesn't need to be accurate. It just have to reflect better or worse performance for a given gear ratio. Later, I ran an actual RC drag strip with the VSM attached, and calibrated the VSM to my timing slips. Actually, for what it costs, the VSM wasn't that far off, and it was a big tuning help.
Hope this helps. Have fun.
AC
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