Sorry - can't help. The answer to your question is one which I am investigating myself using the "brute force" method - make the thing and go fly.

For sure, I have been a bit more rigorous than that, and the manufacturer's data seems ok for my application if I do enough number crunching - BUT - manufacturer's data as we all know is little short of outright advertising, so the "suck it and see" method represents a valid engineering approach.

cheers,
JohnF