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Old 11-30-2011, 08:38 PM   #16
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Originally Posted by andrewdoherty View Post
You don't need to do anything to put it in inches other than take the "mm" out. If you input your tire size in inches your output will be in inches. If you input your tire size in mm, your output will be in mm.
What I wanted to imply was that inches and mm could be done at the same time not one or the other by using separate output boxes

I noticed that Mike B. did his tire size in inches so I wanted to supply equal reference of measurement standards

1 inch = 25.4 mm
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Old 12-01-2011, 08:33 PM   #17
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Originally Posted by Buckaroo View Post
Rearranging the equation to get spur is also a useful tool, especially for oval racers. You see it a lot in the pan car threads: people share what tire diameter works best, what spur works well, and a range of target roll out, but never which pinions work with that combination to get into that range!

When you go to a track or get a new car and have a known wheel diameter, known spur, and a known target roll out, you can plug in the constants and get your target spur without having to guess. That especially helps newbs get into the right range their first time out.

Rollout x Spur / Pi (3.14159) / Tire Diameter (mm) = Pinion
Hi so formula's go:

1. Pi X pinion X Tire Diameter / spur = Rollout
2. Rollout x Spur / Pi (3.14159) / Tire Diameter (mm) = Pinion
3. ? = Spur
4. ? = Tire Diameter

Any math geeks out there to do the final two formula's for the other two variable outputs 3 and 4?

Thanks
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Old 12-02-2011, 11:12 AM   #18
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Originally Posted by Infinite 12th View Post
Hi so formula's go:

1. Pi X pinion X Tire Diameter / spur = Rollout
2. Rollout x Spur / Pi (3.14159) / Tire Diameter (mm) = Pinion
3. ? = Spur
4. ? = Tire Diameter

Any math geeks out there to do the final two formula's for the other two variable outputs 3 and 4?

Thanks
Can someone mathematically inclined help me with these final two equations so I can finish the Rollout companion for those who want alternative outputs for spur, pinion and Tire Diameter

Thank you
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Old 12-02-2011, 11:18 AM   #19
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Originally Posted by Infinite 12th View Post
Can someone mathematically inclined help me with these final two equations so I can finish the Rollout companion for those who want alternative outputs for spur, pinion and Tire Diameter

Thank you
you mean?:

3. Pi X pinion X Tire Diameter / rollout = Spur
4. (Rollout X spur) /(Pi X pinion) = Tire Diameter

BTW I did not check your math...
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Old 12-02-2011, 11:22 AM   #20
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you mean?:

3. Pi X pinion X Tire Diameter / rollout = Spur
4. (Rollout X spur) /(Pi X pinion) = Tire Diameter

BTW I did not check your math...
Yes those are correct and might I say I appreaciate your assistance

I just want the best tool for helping people with pancar gearing calculations

Again thank you
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Old 12-02-2011, 11:27 AM   #21
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Actually your rollout is wrong as it does not include the transmission ratio.

It should be:

rollout = Pi*Tire_Diameter/((spur_teeth/pinion_teeth)*trans_ratio)

(e.g. trans ration is 1:1 for a direct drive)

e.g. xray t3:

tire dia = 63mm
spur = 96
pinion = 45
trans = 1.9

rollout = 48.83
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Old 12-02-2011, 11:37 AM   #22
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Originally Posted by samnelso View Post
Actually your rollout is wrong as it does not include the transmission ratio.

It should be:

rollout = Pi*Tire_Diameter/((spur_teeth/pinion_teeth)*trans_ratio)

(e.g. trans ration is 1:1 for a direct drive)

e.g. xray t3:

tire dia = 63mm
spur = 96
pinion = 45
trans = 1.9

rollout = 48.83
Thank you for the moment we are using this for pancars where the ratio is static 1:1

Maybe after this next build if requested I may do a non-1:1 transmission ratio based app

Thanks again
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Old 12-02-2011, 07:38 PM   #23
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Default Tried to do seperate output box's

Well this was tried but it is harder than expected to work with output boxes

I mean it kinda works but for right now just use the old unless you have idea's



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Old 12-09-2011, 01:14 PM   #24
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can this be put on an ipod shuffle?
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Old 12-09-2011, 05:40 PM   #25
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can this be put on an ipod shuffle?
I think Linux have to use wine installed to have access to MS apps and for apple hardware/software I am unsure

I think another build might come that gives output for not just rollout but tire size, pinion and spur

Also I might include a input box for special ratios for non-pancar applications

However, rollout will be default and on top of the other input boxes as well as 1:1 ration be default

We will see
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Old 06-12-2017, 11:58 PM   #26
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Sorry to revive such an old thread, but my security program ate my copy of rollout companion. Anybody still have one to share, or a newer substitute?
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