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slotted trailing edge flaps whereas spaltklappen are split flaps
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Good Lord. Experts run amok....
The designs for the radiator flaps of the F series were tested as well during this investigation. In fact the aircraft, for those test's the aircraft was fitted with an F series cowling (intake), wheel well covers, and the various radiator flap designs being considered.
A little digging will uncover the fact the radiator flap ended up being a split flap on the production aircraft.
None of that has anything to do with the baseline polar determined from WNr 1929 in standard Bf-109E-3 configuration.
Wannka Wannka Wannnka....
JtD is correct on the cooling flaps being at 60 degrees. There would be a camber change over flaps up configuration if the landing flaps were down.