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Old Oct 10, 2012, 02:16 PM
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The 'Wack, BC, Canada
Joined Oct 2002
12,803 Posts
I suspect part of the reason why plates of that sort are not used is that typically the surfaces spend the big majority of their time either at neutral or deflected so little that there is no significant gap to seal.

If the plates were there for those slight times where large amounts of deflection are used then they would be producing drag of their own that would blow away any advantage they might have for some short rare times that they do help.
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