RE: real scale flight
Guess you couldn't find it so here it is: the [link=http://www.rcgroups.com/forums/showthread.php?t=240358]Aspach 2002 report part 1[/link] with Charlie Binder's 1:10 DC-3. Wing loading is 33 oz/sqft! View the video to see how that looks (not "scale", of course).
[link=http://richard.ferriere.free.fr/3vues/douglas_c47_3v.jpg]Here[/link]'s a 3-view to have an impression of the wing. The [link=http://www.ae.uiuc.edu/m-selig/ads/aircraft.html]Incomplete Guide to Airfoil Usage[/link] tells the DC-3 had NACA 2215 airfoil at root and 2206 at tip. A quick check with [link=http://www.mh-aerotools.de/airfoils/javafoil.htm]JavaFoil[/link] shows the former being very docile (stall-wise) while the latter is nasty, at least at model Re numbers.
That might have been a problem even in full scale, considering the wing sweep giving additional pitch up when stalling the tips first. (And the normal down pitching moment of the airfoil is reduced at stall.) Had the original DC-3 wing washout or did they simply fly at high aoa only with flaps down? Both would work but it's still speculation. Someone here who knows the facts?