Here Is Why Military Submarine Propellers Are Kept Secret
The primary design objective of the modern subs, is noise elimination. Noise can give off can give away the position of the sub. The noise is generally created by cavitation. When it comes to the designing of submarines, the blades are designed so that they are capable of creating thrust while keeping cavitation to a minimum. Older submarines could manage speeds of only 2 or 3 knots. Today’s subs are able to achieve speeds of eight to ten knots while maintaining the same noise level.
Source: http://econintersect.com/pages/video_master.php?video=2021vA90DdR8KRY
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