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Flutter and vortices are wasted motion.
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Perhaps they're only wasted, if we waste them.
No disrespect intended, but there is much yet to be ascertained regarding an appreciable variety of efficient force coupling methods which make use of pressure differentials. As both Dolphins, Brook Trout, and a man named Viktor Schauberger have already been made aware, on various levels.
A good starting point:
Amazon.com: Living Energies: An Exposition of Concepts Related to the Theories of Viktor Schauberger (9780717133079): Callum Coats: Books
I mean, contrary to formerly accepted wisdom, nowadays they are using wind power to race directly upwind at 64% of windspeed....
http://www.sciencedaily.com/releases...0827104702.htm
And going downwind faster than the wind...
What's next?
And we, at least the great majority of us, haven't seen anything yet...
Blessings,
TS