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Feb 7, 2019 at 19:42 comment added crxguy52 @ConjuringFrictionForces is correct, but he missed a step when he converted form linear acceleration to rotation acceleration. Linear acceleration is m/s^2, angular acceleration is rad/sec^2. Therefore, $$a = \dfrac{L}{2\pi}\dfrac{d^2\theta}{dt^2}$$ Since pitch is distance/rev, this converts lead to distance/radian The equivalent inertia is then $$J = (\dfrac{L}{2\pi})^2m$$ The link in his post supports my case.
Feb 6, 2019 at 22:38 comment added ConjuringFrictionForces @crxguy52 Good catch. I made an edit in response to your comment.
Feb 6, 2019 at 22:38 history edited ConjuringFrictionForces CC BY-SA 4.0
Missing 2\pi in the derivation. Fixed in response to comment. Edit makes my formula identical to OP's.
Oct 12, 2018 at 18:44 review Suggested edits
Oct 12, 2018 at 20:34
Feb 2, 2017 at 13:05 comment added DaveS I should remember adding references to my equations like you have heh. Now I can't even remember where I got the equation from my question
Feb 2, 2017 at 13:01 vote accept DaveS
Jan 19, 2017 at 22:03 review Late answers
Jan 19, 2017 at 23:15
Jan 19, 2017 at 21:48 review First posts
Jan 20, 2017 at 1:30
Jan 19, 2017 at 21:47 history answered ConjuringFrictionForces CC BY-SA 3.0