Originally Posted by galaxy flyer
The wing anhedral was definitely a design requirement to suppress the strong stability caused by the high-wing, check out the C-141, B-47, B-52 and all the Russian military freighters. Tupolev Bear, also.
GF
Glad somebody finally said it. Any high wing configuration has "built in" dihedral from an aeroynamic standpoint, witness such a simple example as a C172 compared to a a PA28. The Piper has notable dihedral, while the Cessna has only enough to reliably drain the fuel tanks. Also witness the BAE146, compare the Saab 340 (lots of dihedral) to the Dash and ATR series (none).