12th scale gearing need help ASAP!
02-27-2008, 06:47 PM
#2
That gearing puts you somewhere around 1.60 inch rollout. Depending on the type of track, that sounds a little low. A Monster Stock seems to like 1.65 to 1.75, and a CO27 seems to like 1.75 to 1.85 inch rollouts.
02-27-2008, 06:57 PM
#3
+1...those rollouts are pretty close to what we run. 40x80 carpet track.
02-27-2008, 07:33 PM
#5
Rollout is the distance the tires will move the car for 1 revolution of the motor. The formula takes into account Tire size, spur/pinion, and transmission ratio (this case 1:1)
As with most algebra there are a few correct variations depending on the known variables. I use the following plugged into a spread sheet
(pinion*tire Dia*Pi)
spur gear
Measure tire Dia in units desired for rollout...ie. inches or mm
As with most algebra there are a few correct variations depending on the known variables. I use the following plugged into a spread sheet
(pinion*tire Dia*Pi)
spur gear
Measure tire Dia in units desired for rollout...ie. inches or mm
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