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Correct radius for calculating speed and torque of tank

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huntoon:
Hello All.

I'm look looking for your opinion on whether to calculate the speed & torque of a tracked vehicle using the pitch circle radius of the sprocket or the radius from the center of the sprocket to the ground.



Thanks!

Pogertt:
Use r for your calculations.

huntoon:
Thanks for the fast reply pogertt.
I have a follow-up question.

Would it be best to use r or Rt given below:


Pogertt:
Use Rt.

In your first question, r was chosen because it represented the radius of the wheel, but did not include the thickness of the track.

In the second question Rt was chosen because it DID include the thickness of the track.

huntoon:
Thanks! Would one use Rt for torque and speed calcs?

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