[Paddlewise] Duh, what is a wing paddle?

Okay, I've been reading the thread on wing paddles.  I've found the
discussion very interesting regarding energy expended, work done,
efficiency, etc.  I guess that's what engineers and physicists deal with,
huh?  (and boat designers and paddlers.)

But I have to admit, I don't think I know exactly what a wing paddle is.
Could someone give a definition?  Thanks!


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