sycamore,
I'll leave ftp to answer, but I think we're hunting for a theoretical aerodynamics abbreviation... as ftp said, they were discussing airfoils...
Md and Mdf are obviously flight test abbreviations, and probably familiar to certification test pilots as well.
Without an "abbreviations" list at the head of an article or document.... we're all lost.
p, q and r mean anything to any of you guys, by any chance?
ftp,
Sycamore may have a good idea. Maybe you should post this on the PPRuNe Flight Test forum as well? It may ring somebody else's bell over there.
CJ