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#1
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![]() "Donal" wrote in message ... "Peter Wiley" wrote in message . .. In article , Jeff Morris wrote: "Rick" wrote in message link.net... Jeff Morris wrote: I appreciate that blame is is usually shared. But if a kayak crosses an oil tanker, what blame do you assign to tanker? Without being too pedantic, it is not in my job description to assign blame. There will be a board of Coast Guard officers to handle that chore. It will be a decision based on more than I know about the circumstances. In other words, you don't know. So what is a safe speed for a tanker in a VTS in the fog? You keep evading the question. Should all shipping shut down in the fog? By Donal's logic, there isn't a safe speed. Given that the time/distance taken for a tanker to stop/turn vastly exceeds the distance a human can see in thick fog, a tanker is always at risk of running over a kayaker insisting on being the stand-on vessel and therefore cannot navigate safely. So, yeah, Donal's basically arguing that shipping has to come to a standstill if the lookout can't *see* further than it takes the ship to stop or change course, because a kayak couldn't be reliably detected by radar. Nice thought, pity about its practicality. No, No, No! That in definitely *not* the impression that I intended to convey. I was simply arguing that a vessel should not travel at 25 kts in fog without a lookout. The guy in the kayak cannot expect ships to slow beyond the point where they lose the ability to steer. I guess that for most big ships that this is about 4-5 kts???? In reality, I know that they will exceed this speed. When I cross the TSS in fog, I expect that most ships will be doing about 12 kts, and that some will be doing 18 kts. I also expect/know that some of them won't be sounding their fog horns. The kayak is taking a chance when he crosses the TSS. However, that does not mean that the ships in the TSS should carry on as if there was no risk. If you wish to do 25 kts through the Antartic, in fog, then I have no objection. If you do the same thing in a busy waterway, then I think that you are in breach of the CollRegs. So what did I say that was not consistent with any of this? You really were trolling, weren't you? |
#2
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![]() "Jeff Morris" wrote in message ... "Donal" wrote in message ... "Peter Wiley" wrote in message . .. In article , Jeff Morris wrote: "Rick" wrote in message link.net... Jeff Morris wrote: I appreciate that blame is is usually shared. But if a kayak crosses an oil tanker, what blame do you assign to tanker? Without being too pedantic, it is not in my job description to assign blame. There will be a board of Coast Guard officers to handle that chore. It will be a decision based on more than I know about the circumstances. In other words, you don't know. So what is a safe speed for a tanker in a VTS in the fog? You keep evading the question. Should all shipping shut down in the fog? By Donal's logic, there isn't a safe speed. Given that the time/distance taken for a tanker to stop/turn vastly exceeds the distance a human can see in thick fog, a tanker is always at risk of running over a kayaker insisting on being the stand-on vessel and therefore cannot navigate safely. So, yeah, Donal's basically arguing that shipping has to come to a standstill if the lookout can't *see* further than it takes the ship to stop or change course, because a kayak couldn't be reliably detected by radar. Nice thought, pity about its practicality. No, No, No! That in definitely *not* the impression that I intended to convey. I was simply arguing that a vessel should not travel at 25 kts in fog without a lookout. The guy in the kayak cannot expect ships to slow beyond the point where they lose the ability to steer. I guess that for most big ships that this is about 4-5 kts???? In reality, I know that they will exceed this speed. When I cross the TSS in fog, I expect that most ships will be doing about 12 kts, and that some will be doing 18 kts. I also expect/know that some of them won't be sounding their fog horns. The kayak is taking a chance when he crosses the TSS. However, that does not mean that the ships in the TSS should carry on as if there was no risk. If you wish to do 25 kts through the Antartic, in fog, then I have no objection. If you do the same thing in a busy waterway, then I think that you are in breach of the CollRegs. So what did I say that was not consistent with any of this? You really were trolling, weren't you? No, Jeff. I was having a polite discussion with Joe, in which I was trying to point out that he was a criminally negligent, stupid, CollReg breaching idiot when he was travelling through busy waterways at 25 kts, without keepint a proper lookout. You decided to join in - and your initial post defended Joe's position. DON'T disagree with this before you go back and read the thread!!! Then you tried to claim that a kayak has "no buisness in a TSS". However, the CollRegs do not support you on this. You also suggested that a vessel could proceed under radar watch alone. I know that you later tried to deny this, however most of us can still see your post on this matter. You used all sorts of twisted phrases to try to suggest that a vessel in a TSS does not really need to keep a proper lookout. If you wish to deny this particular accusation, then please feel free. Be warned, I will have a field day at your expense if you decide on this particular course. You also suggested that my arguments were childish .... you suggested that I didn't know much about the CollRegs ... and you generally behaved as if you were more authoritive on marine matters. You assumed that my modesty equated to ignorance. Assumptions are dangerous. Regards Donal -- |
#3
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IMHO a kayak would not be an impediment to a large vessel in any of
the cases you are citing. They'd scarcely know there were bits of fiberglass in their wake. On Wed, 7 Jan 2004 00:23:11 -0000, "Donal" wrote: "Jeff Morris" wrote in message ... "Donal" wrote in message ... "Peter Wiley" wrote in message . .. In article , Jeff Morris wrote: "Rick" wrote in message link.net... Jeff Morris wrote: I appreciate that blame is is usually shared. But if a = kayak crosses an oil tanker, what blame do you assign to tanker? Without being too pedantic, it is not in my job description to assign blame. There will be a board of Coast Guard officers to handle that chore. It will be a decision based on more than I know about = the circumstances. In other words, you don't know. So what is a safe speed for a tanker in a VTS in the fog? You = keep evading the question. Should all shipping shut down in the fog? By Donal's logic, there isn't a safe speed. Given that the time/distance taken for a tanker to stop/turn vastly exceeds the distance a human can see in thick fog, a tanker is always at risk = of running over a kayaker insisting on being the stand-on vessel and therefore cannot navigate safely. So, yeah, Donal's basically arguing that shipping has to come to a standstill if the lookout can't *see* further than it takes the = ship to stop or change course, because a kayak couldn't be reliably = detected by radar. Nice thought, pity about its practicality. No, No, No! That in definitely *not* the impression that I = intended to convey. I was simply arguing that a vessel should not travel at 25 kts in = fog without a lookout. The guy in the kayak cannot expect ships to slow beyond the point = where they lose the ability to steer. I guess that for most big ships that = this is about 4-5 kts???? In reality, I know that they will exceed this = speed. When I cross the TSS in fog, I expect that most ships will be doing about 12 kts, and that some will be doing 18 kts. I also expect/know that = some of them won't be sounding their fog horns. The kayak is taking a chance when he crosses the TSS. However, that does not mean that the ships in the TSS should carry on as if there was = no risk. If you wish to do 25 kts through the Antartic, in fog, then I have = no objection. If you do the same thing in a busy waterway, then I = think that you are in breach of the CollRegs. So what did I say that was not consistent with any of this? You = really were trolling, weren't you? No, Jeff. I was having a polite discussion with Joe, in which I was trying to = point out that he was a criminally negligent, stupid, CollReg breaching idiot = when he was travelling through busy waterways at 25 kts, without keepint a = proper lookout. You decided to join in - and your initial post defended Joe's position. DON'T disagree with this before you go back and read the thread!!! Then you tried to claim that a kayak has "no buisness in a TSS". = However, the CollRegs do not support you on this. You also suggested that a = vessel could proceed under radar watch alone. I know that you later tried to = deny this, however most of us can still see your post on this matter. You used all sorts of twisted phrases to try to suggest that a vessel = in a TSS does not really need to keep a proper lookout. If you wish to deny = this particular accusation, then please feel free. Be warned, I will have a field day at your expense if you decide on this particular course. You also suggested that my arguments were childish .... you suggested = that I didn't know much about the CollRegs ... and you generally behaved as if = you were more authoritive on marine matters. You assumed that my modesty equated to ignorance. Assumptions are dangerous. Regards Donal |
#4
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![]() "robert childers" wrote in message ... IMHO a kayak would not be an impediment to a large vessel in any of the cases you are citing. They'd scarcely know there were bits of fiberglass in their wake. You're quite correct - but what if the vessel is a high speed ferry and it does an emergency stop? The Bar Harbor Fast Cat can go from 10 knots to full stop in 110 meters, but what happens to the 900 people on board? |
#5
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Do you really mean 10 knots to full stop in 110 meters? If so, that's a
fairly gentle stop from a slow 'fast cat'. Cheers MC Jeff Morris wrote: "robert childers" wrote in message ... IMHO a kayak would not be an impediment to a large vessel in any of the cases you are citing. They'd scarcely know there were bits of fiberglass in their wake. You're quite correct - but what if the vessel is a high speed ferry and it does an emergency stop? The Bar Harbor Fast Cat can go from 10 knots to full stop in 110 meters, but what happens to the 900 people on board? |
#6
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This is for a vessel 91 meters long, d5617 tons, carrying 900 passenges and 240
cars. From the accident report: "After the collision, a speed trial was performed on board the "INCAT 046" with three engines in service, as they were the night of the collision, to determine the crash stop distance of the vessel. This was done by taking her to a preset speed and then setting the engine control to 100 per cent power astern. At a speed of 10 knots the ferry was able to come to a complete stop within 111 m, in about 30 seconds. The speed was then increased to 14 knots and the test performed again. The ferry was able to stop within 163 m, in about 45 seconds." From a Navy evaluation: "In addition, it demonstrated the capability of performing a "crashback" (i.e., coming to a dead stop) from 46 knots in just a third of a mile. This is amazing for a vessel of this size, especially compared to a modern aircraft carrier that requires approximately 2 miles to stop." http://www.tea.army.mil/pubs/nr/depl...HSSarticle.pdf I admit this isn't pulling that many G's, but out of 900 people, many of which could be walking around, I'm sure they would end up with more than one lawsuit. BTW, this was originally built for the Bass Strait run. "MC" wrote in message ... Do you really mean 10 knots to full stop in 110 meters? If so, that's a fairly gentle stop from a slow 'fast cat'. Cheers MC Jeff Morris wrote: "robert childers" wrote in message ... IMHO a kayak would not be an impediment to a large vessel in any of the cases you are citing. They'd scarcely know there were bits of fiberglass in their wake. You're quite correct - but what if the vessel is a high speed ferry and it does an emergency stop? The Bar Harbor Fast Cat can go from 10 knots to full stop in 110 meters, but what happens to the 900 people on board? |
#7
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Good lord. Do they really think that full astern the best way to slow a
fast vessel? Do you think they felt the extreme cavitation? Cheers MC Jeff Morris wrote: This is for a vessel 91 meters long, d5617 tons, carrying 900 passenges and 240 cars. From the accident report: "After the collision, a speed trial was performed on board the "INCAT 046" with three engines in service, as they were the night of the collision, to determine the crash stop distance of the vessel. This was done by taking her to a preset speed and then setting the engine control to 100 per cent power astern. At a speed of 10 knots the ferry was able to come to a complete stop within 111 m, in about 30 seconds. The speed was then increased to 14 knots and the test performed again. The ferry was able to stop within 163 m, in about 45 seconds." From a Navy evaluation: "In addition, it demonstrated the capability of performing a "crashback" (i.e., coming to a dead stop) from 46 knots in just a third of a mile. This is amazing for a vessel of this size, especially compared to a modern aircraft carrier that requires approximately 2 miles to stop." http://www.tea.army.mil/pubs/nr/depl...HSSarticle.pdf I admit this isn't pulling that many G's, but out of 900 people, many of which could be walking around, I'm sure they would end up with more than one lawsuit. BTW, this was originally built for the Bass Strait run. "MC" wrote in message ... Do you really mean 10 knots to full stop in 110 meters? If so, that's a fairly gentle stop from a slow 'fast cat'. Cheers MC Jeff Morris wrote: "robert childers" wrote in message ... IMHO a kayak would not be an impediment to a large vessel in any of the cases you are citing. They'd scarcely know there were bits of fiberglass in their wake. You're quite correct - but what if the vessel is a high speed ferry and it does an emergency stop? The Bar Harbor Fast Cat can go from 10 knots to full stop in 110 meters, but what happens to the 900 people on board? |
#8
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I've been on a Fast Cat (@35k) during a crash stop, as a demonstration.
Stopping distance was within a boat length (this was one of the larger cats) The maneuver doesn't involve changing engine speeds, just the direction of the waterjet thrust, and was well within the bounds of most people to easily stay upright (G though grabbing something was a good idea). I've also done this maneuver on Z-drive tugs .... same results .... fact, we sometimes use this maneuver for pilot boarding. .... come down the side of ship on opposite heading at about 5-6 k, crash stop and go astern,in the opposite direction at 6-8k while coming alongside (ship maintains 7-8 k).... (eg scares the bejeebers out of the first time onlookers). otn Jeff Morris wrote: This is for a vessel 91 meters long, d5617 tons, carrying 900 passenges and 240 cars. From the accident report: "After the collision, a speed trial was performed on board the "INCAT 046" with three engines in service, as they were the night of the collision, to determine the crash stop distance of the vessel. This was done by taking her to a preset speed and then setting the engine control to 100 per cent power astern. At a speed of 10 knots the ferry was able to come to a complete stop within 111 m, in about 30 seconds. The speed was then increased to 14 knots and the test performed again. The ferry was able to stop within 163 m, in about 45 seconds." From a Navy evaluation: "In addition, it demonstrated the capability of performing a "crashback" (i.e., coming to a dead stop) from 46 knots in just a third of a mile. This is amazing for a vessel of this size, especially compared to a modern aircraft carrier that requires approximately 2 miles to stop." http://www.tea.army.mil/pubs/nr/depl...HSSarticle.pdf I admit this isn't pulling that many G's, but out of 900 people, many of which could be walking around, I'm sure they would end up with more than one lawsuit. BTW, this was originally built for the Bass Strait run. |
#9
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![]() "robert childers" wrote in message ... IMHO a kayak would not be an impediment to a large vessel in any of the cases you are citing. They'd scarcely know there were bits of fiberglass in their wake. ================= Absolutely correct! Regards Donal -- |