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#81
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Chad Irby wrote:
:In article , : Fred J. McCall wrote: : : I always considered that they'd paste such things with persistent : chemicals, instead. Kill all the depots that way. While we sometimes : claim that we would go nuclear in the face of a chemical attack, would : we really have done it? : : I'm unconvinced we would have done so against the Soviet Union. : :If the USSR was into the realm of dropping planeloads of chemicals on :depots and such, it's hard to imagine that the war wouldn't have crossed :into the "screw 'em, what have we got ready to launch?" phase. : :They built tactical nukes for a *reason*, you know. Yes, they did, and the Soviets had their share of them. Would we have fired the first one in response to a chemical attack in the face of "if you shoot a nuke, we'll empty our magazines back at you after YOUR first use"? I still don't think so, unless there wasn't another choice. -- "Rule Number One for Slayers - Don't die." -- Buffy, the Vampire Slayer |
#82
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![]() "Derek Lyons" wrote in message ... "Kevin Brooks" wrote: (large suspension bridges are a real bear to try and destroy with conventional demo) Seems to me that a largish FLSC (Flexible Linear Shaped Charge) would do to sever one or both of the main suspension lines. Not really. Take a gander at the size of the suspension cables for a large bridge--they can be up to around three or more feet in diameter (the Golden Gate is a bit over 36 inches). Take a gander at what kind of shaped charge liner it would take to penetrate what is essentially 18 inches of steel, and how much explosive is required to back it. Then imagine how massive that puppy would have to be to get around that three foot cable. When we were taught bridge demo, the large suspension bridge was not even really addressed (I can recall an instructor flippantly remarking that it would probably be best to just park a couple of fuel trucks under the cable at its lowest point and light them off and hope that the thermal loading degraded the strength enough to drop it). Given *lot's* of prep time you could make it work, but you'd probably have to resort to precutting the cable part way with a torch. I can recall an old Alistair MacLean novel where the bad guys were going to drop the Golden Gate with "beehive" charges--but imagine the efffect if you did wrap a ring of maybe the standard 40 pound chaped charges around one of those cables. You'd end up with a few small diameter holes penetrating most if not all of the way to the center, but you'd only be taking out maybe 15 percent of the cross sectional area, which is unlikely to do anything other than weaken the structure. Brooks D. -- Touch-twice life. Eat. Drink. Laugh. |
#83
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In article ,
"Kevin Brooks" wrote: When we were taught bridge demo, the large suspension bridge was not even really addressed (I can recall an instructor flippantly remarking that it would probably be best to just park a couple of fuel trucks under the cable at its lowest point and light them off and hope that the thermal loading degraded the strength enough to drop it). One of those "how to knock down buildings" shows on Discovery showed a medium-sized suspension bridge somewhere getting knocked down, and they didn't screw with the main cables for the primary cuts. They just knocked down the vertical suspending cables with a *lot* of much smaller charges, taking out the deck. I suppose they went back later and cut the big cables, but if you don't have something to drive on, it's not that useful, especially in the short term. Now, if you had some good prep time, a half-ton chunk of thermite wrapped around the cable could be interesting... -- cirby at cfl.rr.com Remember: Objects in rearview mirror may be hallucinations. Slam on brakes accordingly. |
#84
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![]() "Chad Irby" wrote "Kevin Brooks" wrote: When we were taught bridge demo, the large suspension bridge was not even really addressed (I can recall an instructor flippantly remarking that it would probably be best to just park a couple of fuel trucks under the cable at its lowest point and light them off and hope that the thermal loading degraded the strength enough to drop it). One of those "how to knock down buildings" shows on Discovery showed a medium-sized suspension bridge somewhere getting knocked down, and they didn't screw with the main cables for the primary cuts. They just knocked down the vertical suspending cables with a *lot* of much smaller charges, taking out the deck. I suppose they went back later and cut the big cables, but if you don't have something to drive on, it's not that useful, especially in the short term. Now, if you had some good prep time, a half-ton chunk of thermite wrapped around the cable could be interesting... I would think the anchors at the ends of the suspension cables would be a fruitful place to start but somehow I don't think the Golden Gate's anchors have prebuilt demo chambers. |
#85
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![]() "Chad Irby" wrote Fred J. McCall wrote: I always considered that they'd paste such things with persistent chemicals, instead. Kill all the depots that way. While we sometimes claim that we would go nuclear in the face of a chemical attack, would we really have done it? I'm unconvinced we would have done so against the Soviet Union. If the USSR was into the realm of dropping planeloads of chemicals on depots and such, it's hard to imagine that the war wouldn't have crossed into the "screw 'em, what have we got ready to launch?" phase. They built tactical nukes for a *reason*, you know. A not very well thought out reason. Unless you are willing to detail nuclear targeting to an SF sergeant or a FAC, aside from some rear-area logistics and transportation targets, the intended target set was either too fleeting or too close to FLOT. The weapon release/target authorization cycle was just too long. Then there was the memorable phrase that "West German villages averaged 3KT apart". What made the Red Tide recede were things like Pave Mover, the associated strike weapons systems and US training and doctrine that resulted in US arms able to move_lots_faster than the Sovs' system of command and control. That last is interesting because during the sixties and seventies, much of the literature credited the Soviet system of battle drills as delivering a very flexible and fast responding tactical instrument to Soviet commanders. Then it came to light that most of those "battle drills" were practiced by crowds of Soviet soldiers running up and down hillsides chanting "tank, tank, tank..." (OK, I made that last part up but the running part was true). I have a book called "Measuring Military Power" (Joshua Epstein) from that era that tried to calculate war-fighting ability, taking into account the short lifetimes of Soviet-era equipment. What Epstein missed was that if the aircraft and tank engines had 500 hour lives then not much training got done, just Gun Decked. False reporting gave the Soviets (and western intel shops) wildly optimistic views of Soviet readiness states that started to evaporate in Afghanistan. |
#86
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In article , "Kevin Brooks"
wrote: "Owe Jessen" wrote in message ... Am Fri, 27 Feb 2004 03:15:43 GMT, schrieb Fred J. McCall : Owe Jessen wrote: :Could you give in some applications for the SADM? ISTR from childhood ![]() :with :atomic bombs. Why was it thought necessary to use those instead of :conventional explosives? Aside from the fact that using nuclear :weopons just for the fun in a friendly country might not be overly ![]() Because wiring a modern bridge with sufficient explosives to bring it down is not a quick job. Failure to manage this cost the Germans dearly in WWII. Either we wire them up and leave them that way in peacetime (not real safe) or you take them down fast with nukes in wartime. I guess the folks living next to the bridges were thrilled. Or was the plan to use it only, if nuclear weapons were allready being used? Bridges were not a very common target for SADM. I have to admit I was using "bridge" as shorthand for "transportation bottleneck," as it hadn't been used precisely in every case. Yes, I agree that the most probable defensive use of ADMs would be road cuts, where you aren't just destroying structural integrity of a bridge, but needing to cause the collapse of hundreds to thousands of tons of rock. They still might have made sense for a "friendly" bridge that had not been prechambered, or for special operations against bridges in the enemy rear. No code for the PAL, and the weapon would crunch itself so that it would not be usable. IIRC, the ADMs had fairly simple PALs -- essentially combination locks that could not reasonably be bypassed in the field. These were significantly different from the later, limited retry, multiple code option PALs, which would also destroy key components of the devices. |
#87
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![]() "Paul F Austin" wrote in message . .. "Chad Irby" wrote "Kevin Brooks" wrote: When we were taught bridge demo, the large suspension bridge was not even really addressed (I can recall an instructor flippantly remarking that it would probably be best to just park a couple of fuel trucks under the cable at its lowest point and light them off and hope that the thermal loading degraded the strength enough to drop it). One of those "how to knock down buildings" shows on Discovery showed a medium-sized suspension bridge somewhere getting knocked down, and they didn't screw with the main cables for the primary cuts. They just knocked down the vertical suspending cables with a *lot* of much smaller charges, taking out the deck. I suppose they went back later and cut the big cables, but if you don't have something to drive on, it's not that useful, especially in the short term. Now, if you had some good prep time, a half-ton chunk of thermite wrapped around the cable could be interesting... I would think the anchors at the ends of the suspension cables would be a fruitful place to start but somehow I don't think the Golden Gate's anchors have prebuilt demo chambers. You'd probably need some pretty massive prechambers. The weight for each anchor on the Golden Gate is a whopping 60 thousand tons. Which would be equivalent to a solid cube with sides a bit over 30 yards long. Buried. Merely busting up that reinforced concrete behemoth does not guarantee success, either, as long as the bulk of the mass remains in place and the reinforcing steel continues to distribute the load throughout the bulk. Brooks Brooks |
#88
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![]() "Howard Berkowitz" wrote in message ... In article , "Kevin Brooks" wrote: "Owe Jessen" wrote in message ... Am Fri, 27 Feb 2004 03:15:43 GMT, schrieb Fred J. McCall : Owe Jessen wrote: :Could you give in some applications for the SADM? ISTR from childhood ![]() :with :atomic bombs. Why was it thought necessary to use those instead of :conventional explosives? Aside from the fact that using nuclear :weopons just for the fun in a friendly country might not be overly ![]() Because wiring a modern bridge with sufficient explosives to bring it down is not a quick job. Failure to manage this cost the Germans dearly in WWII. Either we wire them up and leave them that way in peacetime (not real safe) or you take them down fast with nukes in wartime. I guess the folks living next to the bridges were thrilled. Or was the plan to use it only, if nuclear weapons were allready being used? Bridges were not a very common target for SADM. I have to admit I was using "bridge" as shorthand for "transportation bottleneck," as it hadn't been used precisely in every case. Yes, I agree that the most probable defensive use of ADMs would be road cuts, where you aren't just destroying structural integrity of a bridge, but needing to cause the collapse of hundreds to thousands of tons of rock. They still might have made sense for a "friendly" bridge that had not been prechambered, or for special operations against bridges in the enemy rear. No code for the PAL, and the weapon would crunch itself so that it would not be usable. IIRC, the ADMs had fairly simple PALs -- essentially combination locks that could not reasonably be bypassed in the field. These were significantly different from the later, limited retry, multiple code option PALs, which would also destroy key components of the devices. It has been quite a few years since I sat through the very basic lectures we received on the SADM (being in the very last EOBC class to go through that phase), but IIRC the PAL was set up such that failure to input the proper code would result in the device inerting itself. Or at least that was what we were told as we viewed the training device from our stadium seating arrangement. It was not that big a deal for us--our job was to be able to run the calcualtions for emplacement requirements (i.e., determine the depth of placment required to acheive the required effect)--the ADM guys, who had to attend a special ADM course (which was three to five weeks long, IIRC), would have been the guys doing the arming. We were supposed to be able to help arm it and if necessary provide the demolition guard (minus the requirement for actually firing the device). Brooks |
#89
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In article , "Kevin Brooks"
wrote: "Paul F Austin" wrote in message . .. "Chad Irby" wrote "Kevin Brooks" wrote: When we were taught bridge demo, the large suspension bridge was not even really addressed (I can recall an instructor flippantly remarking that it would probably be best to just park a couple of fuel trucks under the cable at its lowest point and light them off and hope that the thermal loading degraded the strength enough to drop it). One of those "how to knock down buildings" shows on Discovery showed a medium-sized suspension bridge somewhere getting knocked down, and they didn't screw with the main cables for the primary cuts. They just knocked down the vertical suspending cables with a *lot* of much smaller charges, taking out the deck. I suppose they went back later and cut the big cables, but if you don't have something to drive on, it's not that useful, especially in the short term. Now, if you had some good prep time, a half-ton chunk of thermite wrapped around the cable could be interesting... I would think the anchors at the ends of the suspension cables would be a fruitful place to start but somehow I don't think the Golden Gate's anchors have prebuilt demo chambers. You'd probably need some pretty massive prechambers. The weight for each anchor on the Golden Gate is a whopping 60 thousand tons. Which would be equivalent to a solid cube with sides a bit over 30 yards long. Buried. Merely busting up that reinforced concrete behemoth does not guarantee success, either, as long as the bulk of the mass remains in place and the reinforcing steel continues to distribute the load throughout the bulk. Hmmmm...it's California, after all. I wonder if a sufficient number of troops indulging in California's most valuable agricultural crop could get into a mindspace to levitate it? |
#90
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In article , "Kevin Brooks"
wrote: It has been quite a few years since I sat through the very basic lectures we received on the SADM (being in the very last EOBC class to go through that phase), but IIRC the PAL was set up such that failure to input the proper code would result in the device inerting itself. From my recollection of open sources, the inerting was of the arming mechanism, not the actual nuclear components. In other words, to use it, you'd have to build and reinstall at least an entirely new arming and firing system, but the physics package was intact. In contrast, some later PALs were supposed to damage the nuclear components to a point that they would only be useful as (possibly contaminated) raw materials. One example cited was that a neutron-absorbing safety wire or rod, normally retracted from the inside of the hollow pit during the firing process, could be broken off inside the pit if the PAL decided there was an unauthorized firing attempt. |
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