Quote:
Originally Posted by jannickz
thanks for this
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If this link works, you'll be looking at the German AIP, one-man, 'Delfin' ( dolphin ) midget sub, it's design influenced by the 'Lyon Shape.'
You'll notice that the hull of the sub is in constructed from 5-elements. The '3rd' element from the 'nose' is just a cylindrical extension, to give some extra space for the pilot.
If you remove this section, and rejoin nose and tail without it, it produces a streamline body of revolution with fineness-ratio of 3:1, which produces a drag coefficient near the drag minimum known.
You see a very generous transition zone, where the rear downslope leading to the trailing edge evolves very gently, in one continuous, uninterrupted contour.
This produces the favorable pressure gradient necessary for attached flow, and pressure recovery responsible for lowest drag.
This is the whole premise for 'streamlining' and 'aerodynamics.'
It's no surprise that those specializing in streamlining are getting 'dosed' with this technology. It's the 'Golden Goose.'
H I Sutton - Covert Shores