John, this servo torque calculator is an answer to a design issue I've been pursing for some time, so thank you so much. Is this your work?

Manufacturers catalogs detail servo power, and offer some choices in quality of materials (bearings, gear material, etc.) but very little application data. I think we're often selecting them based on guesswork or conservative experience, or just following what everyone else does like sheep. (Until they strip a gear and crash, of course!)

I wanted some rational engineering estimates of the power required to move control surfaces, and now I have it. Now I can select the servos based on the need.

(And then go do a figure "9" due to dumb thumbs. :-))))

What a great hobby!

- Balsacutter