[RCSE] "Drela foils" == marketing gimmick now?

[fprintf]

If you check out the various ads and articles in Model Aviation you will 
notice how many of them refer to "Drela airfols". It is true that the 
Bubble Dancer, Allegro and other assorted planes fly quite nicely, but I 
wonder how much of the airfoil choice is just a marketing gimmick. One 
extra swipe of the sandpaper by our Czech worker-bee has turned that 
Drela foiled AVA/Topaz/whatever into some other airfoil.

Particularly on these amazing built up RES ships with mylar covering, I 
wonder how much of the performance is due to the airfoil and how much is 
due to very light balsa/composite building techniques.

Does Dr. Drela get a royalty for the use of his name?  Did Dr. Selig?
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