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Old 07-06-2005, 05:56 PM   #1
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Hi, could someone please tell a newcomer how to work out rollout numbers ? thanks
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Old 07-06-2005, 06:21 PM   #2
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HI

heres a handy site for rollout and fdr calculations.

http://www.gearchart.com/index.cfm?f...n=chart.create
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Old 07-07-2005, 03:35 AM   #3
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Hi, A site i find very useful is www.arroyoc.com
In the utilities section is an awesome rollout and gear calculator
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Old 07-07-2005, 07:46 AM   #4
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If you have excel, I have a spreadsheet with all the calculations as well as the "definition" of how the roll-out calc works

email me - [email protected] and I'll hook you up
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Old 07-08-2005, 08:34 PM   #5
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thanx for all the help & info guys. much appreciated
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Old 07-08-2005, 08:50 PM   #6
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Jason to help you understand it a bit more, the exact meaning of the calculation is the distance in MM that the car travels for one RPM of the motor.

For example a rollout of 30 means that the car moves forward 30mm and performs one RPM of the motor from TDC to TDC (if electric motors have a tdc :P )

This directly relates to the size of the tires and the car's gearing. You need to know some constants like the spur size and the internal drive ratio of the car. Usually it is only relevant to foam-tire racing.

As the other guys have said, head over to gearchart.com and fill out the page there - it will give you a great ratio chart or a rollout chart.
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