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Re: Which U Boat Sank USS San Diego off Fire Island?
Posted by: Michael Lowrey ()
Date: March 09, 2004 03:29PM

<HTML>Simon,

I do not have a problem accepting that a 100 kg mine charge could sink an armored cruiser.

The San Diego's watertight doors were closed only after the explosion see [www.militarymuseum.org]

Actually, closing them might have made her sink faster. The San Diego sank from assymetric flooding -- she capsized. This was a common fate in British Pre-Dreadnought battleships and armored cruisers that took a mine or torpedo hit. The root cause was a design defiency. As David K Brown noted in "The Grand Fleet: Warship Design and Development 1906-1922", the centerline bulkhead in the machinery spaces (if not penetrated) of these vessels would cause off-center flooding culminating in a severe list (2 cases) or capize (seven cases).

Brown went on to write: "Armoured cruisers has similar problems, if not worse. Torpedoed in way of the machinery spaces, the centerline bulkhead would guarantee capsize." Brown then mentions, Hogue, Aboukir, and Cressy, all of which capsized after taking torpedo hits, two of them as I recall only a single 450mm torpedo hit. The maximum charge Rössler lists for a 45 cm is 147.5 kg.

I am not completely impressed by Jahnke's tale. The article is online at: [research.unc.edu]

Best wishes,

Michael</HTML>

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Subject Written By Posted
Which U Boat Sank USS San Diego off Fire Island? Bill Ramsay 03/09/2004 01:45AM
Re: Which U Boat Sank USS San Diego off Fire Island? Michael Lowrey 03/09/2004 05:55AM
Re: Which U Boat Sank USS San Diego off Fire Island? Simon 03/09/2004 08:01AM
Re: Which U Boat Sank USS San Diego off Fire Island? Michael Lowrey 03/09/2004 03:29PM
Re: Which U Boat Sank USS San Diego off Fire Island? ROBERT M. 03/21/2004 10:49PM
Re: Which U Boat Sank USS San Diego off Fire Island? Yves D 03/09/2004 09:20PM
Re: Which U Boat Sank USS San Diego off Fire Island? Simon 03/10/2004 08:11AM
Re: Which U Boat Sank USS San Diego off Fire Island? Yves D 03/10/2004 07:07PM
Re: Which U Boat Sank USS San Diego off Fire Island? Bill Ramsay 03/11/2004 02:56AM


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