Talk:Spanish submarine Peral

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Military history: Maritime / European / Spanish Start‑class

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Displacement edit

Latest comment: 9 years ago4 comments3 people in discussion

Don't they displace more water when surfaced than when submerged? Or is there a convention in measurement involved here? Midgley (talk) 07:50, 27 December 2011 (UTC)Reply

No. Consider the total hull volume. Submerged, it's not floating... TREKphiler ^{any time you're ready, Uhura} 19:57, 27 December 2011 (UTC)Reply

That would depend. An object dragged underwater, (but not flooded), will displace more water than surfaced, equal to the volume that would be above the water when surfaced. However, using ballast tanks to achieve neutral or negative buoyancy reduces the actual displacement of the hull since flooded spaces do not contribute to actual displacement. So, hypothetically, a submarine might displace less while diving, if the volume of its flooded tanks exceeds the volume of its hull which is above the water when surfaced. I've never seen a schematic for a sub that had tanks that looked that large though...(I have not done the math on it). That said, a hull's listed displacement is an estimated figure of its external volume below the water line, fully fueled and loaded, but neglecting innumerable small factors.Ernest Ruger (talk) 03:09, 10 February 2015 (UTC)Reply

Ernest Ruger (talk) 03:14, 10 February 2015 (UTC)== Welded hull? ==Reply

She looks welded. Is she? There's no mention of her hull's construction details here. Are they unavailable?

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