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Old 05-22-2005, 09:19 PM   #1
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Default Gear Ratio Calculation Software

Hi all,
seeing a lot of people don't really know how/having problem when they try to calculate the gear ratio/final drive/rollout, I've decided to make a small contribution to the RC community by writing a RC gear ratio/rollout/whatever calculator software. I'll try to make the software as easy to use as possible yet provide as much features as i could. My software will be able to calculate the gear ratio, rollout, theoretical top speed..etc of your RC automatically. I imagine it would be quite handy to most of you guys.

At this stage, it should be quite an easy/small project but as i'm only going to work on it when i got some free time so i don't think you can see it in a few days time. But anyway, i would need a database of the car/motor spec so it would be great if you guys can help me build up my database:

1. The internal gear ratio, stock spur gear, factory pinion gear (if any) of all the popular RC cars

2. max speed of all the popular motors (rpm)

so please leave a msg here with something like this:

HPI RS4 Pro4 Internal Gear Ratio 2.4375 Factory Pinion 98T Factory Spur N/A

or

Trinity D6 8x2 599999rpm (of course it's not the real figure)


If you got any other suggestions, please feel free to tell me and if it's a good idea, i'll try to make my best to make it happen.

oh yes, it'll be a freeware

Richard
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Old 05-22-2005, 09:21 PM   #2
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www.gearchart.com already does what you are describing.
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Old 05-22-2005, 09:23 PM   #3
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yup gear chart, use it everytime
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Old 05-22-2005, 09:26 PM   #4
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...yep ...and pretty soon (next couple of weeks) you will be able to save your gearcharts off as pdf files, as soon as I can get some spare time to get that cookin
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Old 05-22-2005, 09:26 PM   #5
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oh that's good. but what about if i can do it in a slightly different way? and it will be a desktop app so you can save it to your laptop.
or you think i shouldn't waste my time?
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Old 05-22-2005, 09:27 PM   #6
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Hey Javier.
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Old 05-22-2005, 09:29 PM   #7
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Also, I have one that will work on your PalmOS based PDA

http://www.sixfoottiger.com/rccalc.cfm
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Old 05-22-2005, 09:32 PM   #8
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It's up to you ...the way I felt about it when I 1st made it up was that it would be a lot easier to keep the database/ additional features (e.g. I've added rollout calculations, target rollout calculations, additional cars as they come out, battery performance charting, etc...) as a web based tool versus hacing "thousands" of users having some executable on their system (there hace been 95,000+ gearcharts created to date).
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Old 06-14-2005, 09:13 PM   #9
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Whats the advantage to running a larger spur gear? If the final drives come out the same, what would be the difference between running a 108 spur to a 37 pinion versus a 100 Spur and a 34 pinion? Do you get more torque with the larger spur or with a smaller spur?
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Old 05-06-2010, 02:26 AM   #10
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Quote:
Originally Posted by Glowster21 View Post
Whats the advantage to running a larger spur gear? If the final drives come out the same, what would be the difference between running a 108 spur to a 37 pinion versus a 100 Spur and a 34 pinion? Do you get more torque with the larger spur or with a smaller spur?
Interesting question indeed.

Assuming the final ratio is exactly the same, would be more beneficial using a larger spur or is it the same ?
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Old 05-06-2010, 09:20 AM   #11
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http://www.rctech.net/forum/electric...alculator.html

This one does all you need and the chassis database is updated regularly.
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Old 05-07-2010, 05:06 AM   #12
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Quote:
Originally Posted by Emmeth View Post
Interesting question indeed.

Assuming the final ratio is exactly the same, would be more beneficial using a larger spur or is it the same ?

Anyone ?


Thx
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Old 05-07-2010, 05:47 AM   #13
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http://www.mediafire.com/?rujni1tytmk
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Old 05-07-2010, 06:59 AM   #14
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Quote:
Originally Posted by Emmeth View Post
Anyone ?


Thx
I think this issue was raised here before and most who responded thought that there is no difference as long as Final Drive is same ratio - people did try to analyze it in terms of weight , resistence etc, but ultimately conclusion was that whatever the impact it will be negligable....a bit like having a very low resistance ESC , but then the solder points offer more reisistance - but thats for a different day
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Old 05-07-2010, 07:19 AM   #15
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Thanks a lot mate

cheers
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