[parma24]

hey what is roll out

how do u find out roll out

what is the gearing of 2.50 roll out and that is the gearing of 2.35 roll out

mark

 

[fredracer]

roll out is the distance travelled with one motor rev

RO=tire diam x Pi / gear ratio

 

[hankster]

We have a rollout chart available at http://www.hobbytalk.com/modules.php?op=modload&name=News&file=article&sid=23

We also have a "Gear Finder" program at http://www.hobbytalk.com/modules.php?op=modload&name=Downloads&file=index&req=viewdownload&cid=1

 

[highroller]

For transmission cars you need to know it's ratio for direct drive you use only tire diameter divided by gear ratio (spur/pinion).
The difference you stated for example if tire and spur size were unchanged then the 2.50 is a larger pinion, while the 2.35 uses a smaller pinion.
Transmissions vehicles
transmission ratio multiplies by tire diameter (distance across x Pi 3.14) divided by gear ratio (spur/pinion) = rollout
Direct drive pan cars
tire diameter (distance across x pi or 3.14) divided by gear ratio

 

[Donn]

Hankster, neither of your links for a gear chart or roll out work, they just take you to the front page for the forums.

 

[RPM]

hey what is roll out

how do u find out roll out

what is the gearing of 2.50 roll out and that is the gearing of 2.35 roll out

mark

WHAT??
You don't need charts or graphs?? You need math!

** Note: this formula is for pan car 1/12 or 1/10 scale cars with no trans..

ROLLOUT FORMULA:

Rollout = tire size (inches) X 3.142 X Pinion size / Spur size


To find pinion size at a certain rollout the Formula is this:

Pinion = Rollout X Spur size / Tire size (inches) X 3.142

Just rotate the formula to what you need...and keep it smiple! :thumbsup:


___________________________________
No, I just stayed at a Holiday Inn Express last night!

 

[Jim Smith]

Hey, charts and graphs can be ~fun~... Here's some to look at http://jimsmith.iwarp.com/RCDownLoads.html