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Re: Four winged dinosaur?

> Or perhaps they were just used as a semi-fixed surface behind a flapping
> surface, which would substantially improve the thrust coefficient. (this
> doesn't require that they be held in a horizontal position).
> JimC

Please explain.

> David Marjanovic wrote:
> > Or maybe it was a
> > windsurfer that made its own wind??? Pfffff...

On the other hand, a _transverse_ surfboard... :-)