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Old 09-06-2009
Doomanic Doomanic is offline
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Default Gear Ratio Calculater

What is the address of the gear ratio calculator that I have seen mentioned in the "Runtimes" thread and what information do I need to input for an RC8?
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Old 09-06-2009
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They're easy enough to make (at least for FDR). Create a spreadsheet, put pinion sizes down the left (column A, starting in row 2) and spur gears along the top (row 1, starting in column B), put the internal gear ratio in the cell A1, in the top left (RC8 = 4.3) then enter this formula in the first cell:

=(B$1*$A$1)/$A2

which equates to:
=(spur*int. ratio)/pinion

The dollar signs allow you to copy this formula right across the grid and always reference the appropriate value.

For multiple cars, just duplicate it to a second worksheet, rename it appropriately, and change the internal ratio.

To make it more readable, you can set colour formatting rules, so FDRs below, between or above certain values are indicated with different colours - useful for indicating suitability for different surfaces, or FDRs outside the useful range.
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Old 09-06-2009
Doomanic Doomanic is offline
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Thanks, I have one of those already.

There is a site with a calculator that uses a lot more info than that and give top speed but I can't find the link.
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Old 09-06-2009
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this one?

http://dhrc.rchomepage.com/RolloutCalc.htm
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Old 09-06-2009
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What a good tool!
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Old 09-06-2009
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It's similar, but not the one I am looking for.
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Old 09-06-2009
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Quote:
Originally Posted by Doomanic View Post
It's similar, but not the one I am looking for.

Is it this site?

http://www.gearchart.com/index.cfm?f...n=chart.create

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Old 09-06-2009
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No, it is this, almighty website!

http://www.scriptasylum.com/rc_speed/_top_speed.html
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