oscillations
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>Flettner strips serve only to increase effectiveness of the tabs (and
>stick feel) in making small stick or trim adjustments. Presuming they
>do this by sticking up further into the boundary layer, which is
>fairly thick back there, they need be no bigger than what the book
>says.
They also have an effect on "short period pitch stability" , at least I
think that's the term used. They were originally installed to prevent not
very well damped oscillations at around the one second period, (not
flutter). My memory of these details is not very complete and could be
inaccurate!
Graham
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