While this type of water screw may provide accurate flow measurements, various groups, including goverments, have spent hundreds of years refining propellers to push boats around. The familiar bladed propeller has been proven to be more efficient and effective for propulsion again and again.
If I remember correctly, the "Turtle" submarine built in 1776 had hand-powered water screws for propulsion that were very similar to the photo in the link that you posted. So these aren't really a new idea that is waiting to be discovered.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, GNHBus@... wrote:
>
> http://commons.wikimedia.org/wiki/File:Dumas_Neyrpic_Current_Meter.JPG
>
> Interesting selection for "screw" on this flow meter
>
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