A Squared:
Very good breakdown of the SHP problem. I've been stung by that "factor of 12" issue before - it's egg-on-your-face big time!
I will, however, point out 1 or 2 little items: Torque units are properly called "pound-feet" (or "pound-inches") and not "foot-pounds"; the foot-pound is a unit of energy or work.
And the constant 5252 is easy to remember, but it happens to be the quotient of 33000/6.2832 (or 2 pi). I once derived this on my own, many decades ago when I still had sufficient active neurons.
