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#51
January 30th 05, 07:47 AM
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Pat Flannery wrote:
I thought it was a bulge also; I think what it is is that the walkway that is on top of the hull narrows at that point, and the "bulge' is an optical illusion caused by that narrowing. In the high-res photo, the seams on the acoustic cladding can be seen to follow a more or less straight line while the shadow of the walkway railing twists and turns. The bulge looks like an optical illusion. 
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#52
January 30th 05, 03:59 PM
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#53
January 30th 05, 05:50 PM
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In article ,
Pat Flannery writes: Derek Lyons wrote: It's not pressure hull at that point... It's the skin over MBT3. See: http://www.globalsecurity.org/milita...-cut-away2.gif How come you could find that, and I couldn't? That's similar to the one from the "U.S. Submarines 1945-Present" book; I Google image searched all over the web for it with no luck. I was concerned about the damage to the main pressure hull from everything in it experiencing such a rapid deceleration, and all the heavy machinery being suddenly shifted forward from the force of impact (if the people and and all the mess gear went flying across the room, God knows how much energy the steam turbine and reactor mountings withstood) and that shifting damaging the hull. That large standoff between the bow and the front of the pressure hull was probably what saved the sub; try this with a Permit class and it's all over. The Reactor and Engine Room stuff aren't rigid;y mounted to the hull. They're attached to a "raft" that's somewhat free to move within the hull. (There's 2 reasons for that - one's to keep all the noisy, vibrating stuff from touching the outer hull, and the other's to keep all the fiddly high tolerance stuff lined up right as the hull expands and contracts as the depth changes.) What effect that would have on collision resistance, I'm not sure. From teh point of view of large mass inside the sub, but not really attacked to it, it could be very bad. From teh point of view of keeping all the fiddly, high tolerance, and hot (In all senses of the word) stuff intact, it's probably very good. Derek, did you ever play the game of suspending a spoon on a string stretched across the Missile Compartment and guesstimating the depth by how much the string sagged as the hull contracted? -- Pete Stickney Without data, all you have are opinions
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#54
January 30th 05, 07:23 PM
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In article ,
Derek Lyons wrote: There is a shot of the one on the Thresher as it's under construction in that U. S. Submarines book also. IIRC, that one doesn't have the hydrophones in it. Yeah, that's just the structural skeleton of the sphere -- not a complete sphere. -- "Think outside the box -- the box isn't our friend." | Henry Spencer -- George Herbert |
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#55
January 30th 05, 07:24 PM
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#56
January 30th 05, 07:42 PM
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Pat Flannery wrote:
The one I liked was the BQS-6 setup, where three 1/10th scale models of the bow sphere had a commutator crawling around inside of them that activated the particular transducer that was replicated in the model on the bow sphere. Wiring nightmare. To address a point I did not earlier; The compensators don't 'activate' the transducer, they connect the transducers to time delay lines in order to form a sonar 'beam', thus listening in a particular direction. Wiring nightmare, and a maintenance one too! It would have been a ball (bad pun) to see in action though. One of those great gems of the pre-electronic equipment age, like the mechanical gunnery computer on a battleship. Those analog compensators persisted for years. They stopped being installed in the late 60's/early 70's, but were not all replaced until well into the 80's. (When we left the yards in 1984 the BQR-21 had one (antediluvian) analog beamformer and two digital ones. The analog one was finally replaced in 1985.) D. -- Touch-twice life. Eat. Drink. Laugh. -Resolved: To be more temperate in my postings. Oct 5th, 2004 JDL
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#57
January 30th 05, 07:43 PM
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"Mike Chan" wrote:
Pat Flannery wrote: I thought it was a bulge also; I think what it is is that the walkway that is on top of the hull narrows at that point, and the "bulge' is an optical illusion caused by that narrowing. In the high-res photo, the seams on the acoustic cladding can be seen to follow a more or less straight line while the shadow of the walkway railing twists and turns. The bulge looks like an optical illusion. Look not at the shadow of the walkway railings, but at the line of boards at the base of the walkway. The bulge is very, very real. D. -- Touch-twice life. Eat. Drink. Laugh. -Resolved: To be more temperate in my postings. Oct 5th, 2004 JDL
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#58
January 30th 05, 08:00 PM
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In article ,
Pat Flannery wrote: If memory serves, the USN makes a point of never showing the sonar sphere and its dome... Does this mean I get a "I corrected Henry" wetsuit?: http://globalsecurity.org/military/s...sn21-array.jpg Nope, not when there's weasel-wording like "If memory serves" indicating that I'm not certain. You get the "nice try" noseclip. :-) -- "Think outside the box -- the box isn't our friend." | Henry Spencer -- George Herbert |
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#59
January 30th 05, 09:06 PM
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In article ,
Herb Schaltegger writes: In article , l (Peter Stickney) wrote: Derek, did you ever play the game of suspending a spoon on a string stretched across the Missile Compartment and guesstimating the depth by how much the string sagged as the hull contracted? He could tell you . . . but then he'd have to kill you. ;-) Well, he wouldn't _have_ to. That's just a Fringe Benefit for the FBR. -- Pete Stickney Without data, all you have are opinions
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#60
January 30th 05, 09:28 PM
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In article ,
Pat Flannery writes: Scott Lowther wrote: Nor with a giant squid attached to it, as was the case with the USS Stein. You can see just how that happened too, can't you? Squid gets bumped by some big rounded thing that's emitting acoustic waves, figures it's a sperm whale's head, and freaks out. The species was probably a big Moroteuthis: http://www.afsc.noaa.gov/race/media/...a/sqdbrnco.jpg given where the incident occurred (off San Diego). Moroteuthis has claws instead of suction cups on its two long tentacles, and some were found in the covering of the sonar dome. If you think getting grabbed by these- with their ring of teeth around the outside- would be bad: http://www.tonmo.com/images/content/facts-fig2.jpg Try these on for size: http://www.tonmo.com/images/content/facts-fig3.jpg http://www.tonmo.com/images/content/facts-fig4.jpg These are off of what could be the biggest squids on Earth: http://www.tonmo.com/science/public/giantsquidfacts.php No one is quite sure if a giant squid is the answer though; a scientist who saw the things taken out of the sonar dome's covering said she thought they resembled the dentricles that cover the body of a large ray more than the hooks of a large squid. So maybe the destroyer struck a Manta Ray instead of a squid. An addition to the list of Possible Submarine Predators: The Cookie Cutter Shark: http://www.amonline.net.au/fishes/fi...sh/ibrasil.htm A most fascinating beast - among other tings, it glows in the dark, and seems to hunk by luring larger predators into range by masking itself as a Sardine. While they're more a hazard to the Sonar Dome than to the boat itself, you've got to admire the chutzpah of an 18" (50cm) shark taking on a 400' (125m) Steel Ocean Behemoth. At least the Swordfish that speared Alvin looked like it had a chance. (Hmm. since a Megalodon was/possibly is a 100' Great White, just think of what a 50' Cookie Cutter could do. I think I'll get on the horn to Scaramanga and No, CIvile Engineers, to see about enlarging teh Aquarium) I've also noted that some of the Giant Squid references are breaking them down still further, into the Giant Squid and Colossal Squid categories. This is beginning to sound like a side-piece to John Ringo & Devid Weber's "March" series ("March Upcountry", "March to the Sea", "March to the Stars", & soon, "We Few") which involves a recipe for Roast Suckling Damnbeast. The Mardukan Damnbeast is a large predator, notoriously difficult to winkle out of its underground lair. (Just about everything on Marduke is a predator) The only known predator (Other than Man) for the Damnbeast is the HOLY****BEAAST. http://www.scifidimensions.com/Mar01/damnbeast.htm -- Pete Stickney Without data, all you have are opinions
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