Hi there Coyote!!
Thanks for taking the time. So if I take the loaded weight of 109,350 lbs, per your calculations, it would look something like this:
√109,350÷8,656.8 x 210 = 51.50 fps, or 3,090 fpm, or 35.11 mph.
A.) Did I do your math correctly, and
B.) Does this sound right for the Mi26?
Thank you!!