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Originally Posted by ETR3(SS)
Ok lets start with this. The sail is a free flood area. Therefor the parts of the periscope outside of the hull are the same temp as seawater. Hence you don't go looking for periscopes using thermal imagery.
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While it is free flooding, the actual tube is probably thermally connected with the interior, at least partly. If it's made of metal, it conducts heat very well. And as soon as a metal object is raised out of the water, it changes its temperature fairly quickly and rapidly develops a thermal contrast.
I thought that thermal imaging was extensively used to hunt subs in shallow waters.
Quote:
Originally Posted by ETR3(SS)
Scopes + water inside = Bad. This pump would have to be inside the hull, wouldn't work very well outside.  So that means two additional hull penetrations. The less hull penetrations the better. Also this pump would be another sound source. |
The pump would not have to be inside the hull per se. It would merely have to be inside the external tube of the periscope. And noise with things out of the water is hardly an issue. Peristaltic pumps are really quiet, and would suit this application well.
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Originally Posted by ETR3(SS)
To the best of my knowledge James Bond is the only one that has adaptive camouflage available. Also weapons and sensors tech has gotten to the point where you don't have to close to within 1000yds of your target to hit it. So if no one knows you're there, who's looking for a scope in the water?
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Adaptive camo can be made very complicated, but what I had in mind is more of a color/brightness matching to minimize the visual signature.
Quote:
Originally Posted by ETR3(SS)
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Oh, I know a fair amount. That's why I suggested it. I'm mainly familiar with it within the world of aviation, but the principles are universal. Again, if you reduce the intensity of returns, you decrease detection range.