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Old 04-28-2003, 06:56 PM   #31
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i have no clue what roll out is

this might be another stupid question too but what do you mean by the 34 35mm thing???
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Old 04-28-2003, 09:02 PM   #32
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OK, I'll try and make it as clear as I can
Rollout is the distance the car travels per revolution of the motor.

In order to calculate rollout you need to know the following
Tyre diameter
Spur gear size
Pinion gear size
Internal ratio for your car. In your example it is 2.2:1
Value of pi=3.14159

Firstly work out the Final drive ratio for your car which is done by the following equation

Final Drive = (spur gear size/ pinion gear size) X Internal Ratio

To get the rollout figure use the following equation.

Rollout=(Tyre Diameter X Pi ) / Final Drive ratio.

(In equations above the symbol "/" means "divided By")

As an example for you, if your 414MII had a 128tooth Spur gear and 45Tooth Pinion (0.4 Module Tamiya ) with 64mm diameter tyres then your rollout would be calculated as follows.

Final Drive Ratio = (128/45) X 2.2
Therefore FDR equals 6.257

Rollout = (64 X 3.14159) / 6.257
Therefore rollout would be 32.13mm

Hope this is not too confusing

Steevo
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Old 04-28-2003, 10:46 PM   #33
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ahhh ok...

i get it

thanx a bunch

im still a newbie driver. still learning and gathering as much info as i can....
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Old 04-28-2003, 11:19 PM   #34
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I know Steevo already said it above but...

Rollout - "[(Tire Diameter X 3.14 )/(Teeth in Spur Gear/Teeth on Pinion Gear)] / Gearbox Ratio" (from balakracing.com)
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