Ok we seem to have reached a sort of impasse
I thought I might try find some examples of cruising boats with rigid wings, but really didnt see any.
The Russians have a few tris offered for sale with rigid sales but there is no reliable follow up as to there use. We know about the oceanography devices and there are others, and there was the Flettner rotor, most famously used on Cousteaus Alycone. No Alycone isnt the same, but by eye there does seem to be a lot of windage aloft
GeoGarage: Underwater drones being used to detect enemy submarines, piracy and illegal fishing : 3 projects
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Posted by: robriley@rocketmail.com
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