Chuter:
Thanks. You've really helped shed some light here in this topic. So it appears that driving factors are 1) aerodynamic the reduction of interference drag without the use of wing fillets 2) economics, sort of a trade off between the added expense of the wing fillets & the manufacture of the bent wing 3) practicality i,e, landing gear shorten & wing fold clearance & finally 4) propeller clearance. One would think that propeller clearance would be the primary driving factor for the overall design in the first place, since it was originally postulated by books, magazines & journals for years.