You know, I have been flying for a few years now. Mostly "speed" types and I have asolutely no need to calculate this stuff. It gets you no where and your trying to find answers that don't work. I have seen a handful of pilots get so upset at there planes performance when the numbers don't add up. They waste most of there flying day fooling with this or that and they just don't get it! Its like trying to make 2 + 2 = 7.
These calculations produce nothing[&:]