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Re: alula

Philidor11@aol.com wrote:

> I thought from prior discussions
> that takeoffs and landings had something to do with wing flexibility and
> motions.  How does a tuft of feathers help with this?

By allowing a vortex to be shed from the leading edge at will, in order to
reattach seperated turbulent flow or to halt the spanwise spread of seperated
flow, among other uses.