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wrote:

Can anybody in the NG factually and authoritatively address the
relative physics and mechanical efficiency of paddlewheel vs. propeller
as propulsion sources for larger, displacement speed watercraft?

Yup, about a hundred years ago. Why do you suppose the screw
replaced the paddlewheel? If there were any means of propulsion
more efficient than the screw, either the military or the
commercial builders would have switched to it years ago.

-Raf

--
Misifus-
Rafael Seibert

http://www.ralphandsue.com