The D and later 190s were inline... Why do you think the nose lengthened as much as it did?
Stoney, I don't see what the contradiction is, with liquid cooled engines having gills.
Its just an atypical configuration compared to the other liquid cooled engines of the period. Spits, Pony's, P-38's, P-40's...none of these aircraft had cowl flaps. I figured the radiator was up front, but what drove that design decision? Is everything on the D series, from the firewall aft, identical to the earlier variants? If that's the case, then the cowl flaps would make sense, so they didn't have to redesign the aft fuselage to include the radiator and the plumbing. If not, then its just different, that's all.
Sorry, I should have asked this in a new thread instead of hijacking this one. Thanks for the replies.