Confirmed as rubbish.
Originally Posted by haavarla
@Everyone: disregard such numbers!
Jane's charges lots of money and that somehow makes their numbers bullet-proof. Actually, citing single point SFC numbers is complete bullock, so many factors come into play.
Flight performance isn't so terribly complicated, at least when compared to other aeronautical engineering disciplines like structural analysis or full aerodynamics, but still there are always several factors in one equation. Just picking one and neglecting the other is as helpful as a dead horse.
Publicly, we say one thing... Actually, we do another.