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A comment on MT-Propeller 11 blade propeller delivers 15% increase in static thrust. Parent comment
of course, [super]cavitation can do incredible things for efficiency through water as well. maybe even more-so!
https://en.wikipedia.org/wiki/VA-111_Shkval
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of course, [super]cavitation can do incredible things for efficiency through water as well. maybe even more-so!
https://en.wikipedia.org/wiki/VA-111_Shkval