Oli,
Dont have the article yet but I have seen methods like this before. A very interesting subject though. I wonder if anyone has ever verified these servo loads with a direct measurement, ie a force gage. I suspect that most of the digitals we use today are more than enough for our applications. All flying scale stabs maybe an exception, where the hinge line was designed for supersonic conditions maybe?
Even logging precisely the individual servo current throughout a flight together with roll rates, g etc may give a clue?
Andre