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Technique for avoiding collision with floating debris......
Steve wrote:
I'm afraid the human eye ball is about the only thing that can keep you from running into floating debris.. The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. Keep a good watch and have a stout boat.. Failing that, have a collision mat in the emergency locker (along with a plan on how to use it). what is a collision mat, in case i need to know at 3am in the atlantic. |
Technique for avoiding collision with floating debris......
Steve wrote:
I'm afraid the human eye ball is about the only thing that can keep you from running into floating debris.. The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. Keep a good watch and have a stout boat.. Failing that, have a collision mat in the emergency locker (along with a plan on how to use it). what is a collision mat, in case i need to know at 3am in the atlantic. |
Technique for avoiding collision with floating debris......
I'm afraid the human eye ball is about the only thing that can keep you from
running into floating debris.. The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. Keep a good watch and have a stout boat.. Failing that, have a collision mat in the emergency locker (along with a plan on how to use it). -- My opinion and experience. FWIW Steve s/v Good Intentions |
Technique for avoiding collision with floating debris......
I'm afraid the human eye ball is about the only thing that can keep you from
running into floating debris.. The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. Keep a good watch and have a stout boat.. Failing that, have a collision mat in the emergency locker (along with a plan on how to use it). -- My opinion and experience. FWIW Steve s/v Good Intentions |
Technique for avoiding collision with floating debris......
The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. This hasn't been my experience. In calm inner waters, such as the inland passage along the west coast of Canada, radar when set to short range can commonly pick up a log or the top of a deadhead if it breaks the water's surface, and it will routinely pick up a seagull standing on top of it. In fact, I've even seen it pick up the riffles from a tidal rip. Tom Dacon |
Technique for avoiding collision with floating debris......
The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. This hasn't been my experience. In calm inner waters, such as the inland passage along the west coast of Canada, radar when set to short range can commonly pick up a log or the top of a deadhead if it breaks the water's surface, and it will routinely pick up a seagull standing on top of it. In fact, I've even seen it pick up the riffles from a tidal rip. Tom Dacon |
Technique for avoiding collision with floating debris......
Is there an electronic strategy with alarms to avoid collision with
floating objects while sailing ? A full description would be appreciated. Thank you. -- Courtney Thomas s/v Mutiny lying Oriental, NC WDB5619 |
Technique for avoiding collision with floating debris......
Avoidance strategies might reduce the odds of collision somewhat, but not enough to
consider the risk eliminated. Radar, for instance, might work in some conditions, but not all. This leaves two approaches: one, which has been discussed, is preparing to handle the damage efficiently. I'd be curious what percentage of collision damages event can be handled with a collision mat, and how many required abandoning ship. Clearly, when the damage is too severe, most vessels will sink like the proverbial stone, but there are certain levels of damage where a mat will save the day. The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage, since they don't have the dead weight of the keel, and the hulls are shaped to facilitate flotation chambers. But any relatively light vessel can be made reasonably unsinkable. One can make a case that floatation bags are a better investment than a liferaft. -- -jeff www.sv-loki.com "The sea was angry that day, my friend. Like an old man trying to send back soup at the deli." "Courtney Thomas" wrote in message ... Is there an electronic strategy with alarms to avoid collision with floating objects while sailing ? A full description would be appreciated. Thank you. -- Courtney Thomas s/v Mutiny lying Oriental, NC WDB5619 |
Technique for avoiding collision with floating debris......
Avoidance strategies might reduce the odds of collision somewhat, but not enough to
consider the risk eliminated. Radar, for instance, might work in some conditions, but not all. This leaves two approaches: one, which has been discussed, is preparing to handle the damage efficiently. I'd be curious what percentage of collision damages event can be handled with a collision mat, and how many required abandoning ship. Clearly, when the damage is too severe, most vessels will sink like the proverbial stone, but there are certain levels of damage where a mat will save the day. The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage, since they don't have the dead weight of the keel, and the hulls are shaped to facilitate flotation chambers. But any relatively light vessel can be made reasonably unsinkable. One can make a case that floatation bags are a better investment than a liferaft. -- -jeff www.sv-loki.com "The sea was angry that day, my friend. Like an old man trying to send back soup at the deli." "Courtney Thomas" wrote in message ... Is there an electronic strategy with alarms to avoid collision with floating objects while sailing ? A full description would be appreciated. Thank you. -- Courtney Thomas s/v Mutiny lying Oriental, NC WDB5619 |
Technique for avoiding collision with floating debris......
Interesting.
Model? Antenna height? Thanks Brian W On Fri, 21 Nov 2003 15:05:44 -0800, "Tom Dacon" wrote: The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. This hasn't been my experience. In calm inner waters, such as the inland passage along the west coast of Canada, radar when set to short range can commonly pick up a log or the top of a deadhead if it breaks the water's surface, and it will routinely pick up a seagull standing on top of it. In fact, I've even seen it pick up the riffles from a tidal rip. Tom Dacon |
Technique for avoiding collision with floating debris......
Interesting.
Model? Antenna height? Thanks Brian W On Fri, 21 Nov 2003 15:05:44 -0800, "Tom Dacon" wrote: The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. This hasn't been my experience. In calm inner waters, such as the inland passage along the west coast of Canada, radar when set to short range can commonly pick up a log or the top of a deadhead if it breaks the water's surface, and it will routinely pick up a seagull standing on top of it. In fact, I've even seen it pick up the riffles from a tidal rip. Tom Dacon |
Technique for avoiding collision with floating debris......
Maybe on a dead calm sea.
"Tom Dacon" wrote in message ... The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. This hasn't been my experience. In calm inner waters, such as the inland passage along the west coast of Canada, radar when set to short range can commonly pick up a log or the top of a deadhead if it breaks the water's surface, and it will routinely pick up a seagull standing on top of it. In fact, I've even seen it pick up the riffles from a tidal rip. Tom Dacon |
Technique for avoiding collision with floating debris......
Maybe on a dead calm sea.
"Tom Dacon" wrote in message ... The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. This hasn't been my experience. In calm inner waters, such as the inland passage along the west coast of Canada, radar when set to short range can commonly pick up a log or the top of a deadhead if it breaks the water's surface, and it will routinely pick up a seagull standing on top of it. In fact, I've even seen it pick up the riffles from a tidal rip. Tom Dacon |
Technique for avoiding collision with floating debris......
while sailing. Stuff like containers that fell off of freighters will show up on
RADAR. No matter what, there is never any substitute for paying attention. I not if they're submerged just below the surface.... |
Technique for avoiding collision with floating debris......
while sailing. Stuff like containers that fell off of freighters will show up on
RADAR. No matter what, there is never any substitute for paying attention. I not if they're submerged just below the surface.... |
Technique for avoiding collision with floating debris......
I'd say he gave a very complete thought that many could relate to.
The amount of a container which may be above water, when floating on it's own , can easily equate to a log in a river wrote: On Fri, 21 Nov 2003 17:23:41 -0800, Josh Assing wrote: while sailing. Stuff like containers that fell off of freighters will show up on RADAR. No matter what, there is never any substitute for paying attention. I not if they're submerged just below the surface.... Please speak in complete thoughts, and maybe even cite real life examples to support your claim that this could even happen. Thank you BB |
Technique for avoiding collision with floating debris......
I'd say he gave a very complete thought that many could relate to.
The amount of a container which may be above water, when floating on it's own , can easily equate to a log in a river wrote: On Fri, 21 Nov 2003 17:23:41 -0800, Josh Assing wrote: while sailing. Stuff like containers that fell off of freighters will show up on RADAR. No matter what, there is never any substitute for paying attention. I not if they're submerged just below the surface.... Please speak in complete thoughts, and maybe even cite real life examples to support your claim that this could even happen. Thank you BB |
Technique for avoiding collision with floating debris......
Even if your radar will pick up such a low profile object, how would you be
able to set an alarm to such a low threshole and not get false trigger from the just a slight chop. Your radar has better sensitivity than mine.. I would be happy if I could see a mooring bouy when coming into an anchorage at night. Steve s/v Good Intentions |
Technique for avoiding collision with floating debris......
Even if your radar will pick up such a low profile object, how would you be
able to set an alarm to such a low threshole and not get false trigger from the just a slight chop. Your radar has better sensitivity than mine.. I would be happy if I could see a mooring bouy when coming into an anchorage at night. Steve s/v Good Intentions |
Technique for avoiding collision with floating debris......
For boats w/out a bowsprit, a good thick strip of SS, say 3/16 x 1 (or
1-1/2), running down the stem from below the forestay fitting to the curve of the forefoot would help reduce damage. Would also help when indulging in a little "Chicago parking" into concrete docks at a couple knots... g Bowsprits usually have a stay (correct name escapes me at the moment) down to the water line. In this case you could run the SS strip from the lower end of the stay down the forefoot, but if you charged into anything above the water, you'd catch 'sprit stay. Probably the strip would still help, though. Rufus Jeff Morris wrote: Avoidance strategies might reduce the odds of collision somewhat, but not enough to consider the risk eliminated. Radar, for instance, might work in some conditions, but not all. This leaves two approaches: one, which has been discussed, is preparing to handle the damage efficiently. I'd be curious what percentage of collision damages event can be handled with a collision mat, and how many required abandoning ship. Clearly, when the damage is too severe, most vessels will sink like the proverbial stone, but there are certain levels of damage where a mat will save the day. The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage, since they don't have the dead weight of the keel, and the hulls are shaped to facilitate flotation chambers. But any relatively light vessel can be made reasonably unsinkable. One can make a case that floatation bags are a better investment than a liferaft. |
Technique for avoiding collision with floating debris......
For boats w/out a bowsprit, a good thick strip of SS, say 3/16 x 1 (or
1-1/2), running down the stem from below the forestay fitting to the curve of the forefoot would help reduce damage. Would also help when indulging in a little "Chicago parking" into concrete docks at a couple knots... g Bowsprits usually have a stay (correct name escapes me at the moment) down to the water line. In this case you could run the SS strip from the lower end of the stay down the forefoot, but if you charged into anything above the water, you'd catch 'sprit stay. Probably the strip would still help, though. Rufus Jeff Morris wrote: Avoidance strategies might reduce the odds of collision somewhat, but not enough to consider the risk eliminated. Radar, for instance, might work in some conditions, but not all. This leaves two approaches: one, which has been discussed, is preparing to handle the damage efficiently. I'd be curious what percentage of collision damages event can be handled with a collision mat, and how many required abandoning ship. Clearly, when the damage is too severe, most vessels will sink like the proverbial stone, but there are certain levels of damage where a mat will save the day. The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage, since they don't have the dead weight of the keel, and the hulls are shaped to facilitate flotation chambers. But any relatively light vessel can be made reasonably unsinkable. One can make a case that floatation bags are a better investment than a liferaft. |
Technique for avoiding collision with floating debris......
It's frequently called the "Bob Stay" - dunno who bob is/was.
I've always wondered why they didn't mold 6" worth of bumber along the stem out of that same high density rubber they make auto bumbers out of. It could be faired into the hull so that it would have a minimal effect on drag. My understanding is that by distributing the impact onto perhaps a square foot of the strongest portion of the hull, it would prevent major damage when striking the object with the stem (which I assume would be the most likely initial point of contact, as opposed to a glancing blow along the topsides or some such. - Dan Rufus wrote: For boats w/out a bowsprit, a good thick strip of SS, say 3/16 x 1 (or 1-1/2), running down the stem from below the forestay fitting to the curve of the forefoot would help reduce damage. Would also help when indulging in a little "Chicago parking" into concrete docks at a couple knots... g Bowsprits usually have a stay (correct name escapes me at the moment) down to the water line. In this case you could run the SS strip from the lower end of the stay down the forefoot, but if you charged into anything above the water, you'd catch 'sprit stay. Probably the strip would still help, though. Rufus Jeff Morris wrote: Avoidance strategies might reduce the odds of collision somewhat, but not enough to consider the risk eliminated. Radar, for instance, might work in some conditions, but not all. This leaves two approaches: one, which has been discussed, is preparing to handle the damage efficiently. I'd be curious what percentage of collision damages event can be handled with a collision mat, and how many required abandoning ship. Clearly, when the damage is too severe, most vessels will sink like the proverbial stone, but there are certain levels of damage where a mat will save the day. The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage, since they don't have the dead weight of the keel, and the hulls are shaped to facilitate flotation chambers. But any relatively light vessel can be made reasonably unsinkable. One can make a case that floatation bags are a better investment than a liferaft. -- Dan Best - (707) 431-1662, Healdsburg, CA 95448 B-2/75 1977-1979 Tayana 37 #192, "Tricia Jean" http://rangerbest.home.comcast.net/TriciaJean.JPG |
Technique for avoiding collision with floating debris......
It's frequently called the "Bob Stay" - dunno who bob is/was.
I've always wondered why they didn't mold 6" worth of bumber along the stem out of that same high density rubber they make auto bumbers out of. It could be faired into the hull so that it would have a minimal effect on drag. My understanding is that by distributing the impact onto perhaps a square foot of the strongest portion of the hull, it would prevent major damage when striking the object with the stem (which I assume would be the most likely initial point of contact, as opposed to a glancing blow along the topsides or some such. - Dan Rufus wrote: For boats w/out a bowsprit, a good thick strip of SS, say 3/16 x 1 (or 1-1/2), running down the stem from below the forestay fitting to the curve of the forefoot would help reduce damage. Would also help when indulging in a little "Chicago parking" into concrete docks at a couple knots... g Bowsprits usually have a stay (correct name escapes me at the moment) down to the water line. In this case you could run the SS strip from the lower end of the stay down the forefoot, but if you charged into anything above the water, you'd catch 'sprit stay. Probably the strip would still help, though. Rufus Jeff Morris wrote: Avoidance strategies might reduce the odds of collision somewhat, but not enough to consider the risk eliminated. Radar, for instance, might work in some conditions, but not all. This leaves two approaches: one, which has been discussed, is preparing to handle the damage efficiently. I'd be curious what percentage of collision damages event can be handled with a collision mat, and how many required abandoning ship. Clearly, when the damage is too severe, most vessels will sink like the proverbial stone, but there are certain levels of damage where a mat will save the day. The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage, since they don't have the dead weight of the keel, and the hulls are shaped to facilitate flotation chambers. But any relatively light vessel can be made reasonably unsinkable. One can make a case that floatation bags are a better investment than a liferaft. -- Dan Best - (707) 431-1662, Healdsburg, CA 95448 B-2/75 1977-1979 Tayana 37 #192, "Tricia Jean" http://rangerbest.home.comcast.net/TriciaJean.JPG |
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Technique for avoiding collision with floating debris......
Bumber? Most boats aren't designed with the assumption that
the captain runs into thing all the time. When a collision does occur, it is not always straight on. The few times I have bumped on a log or other junk, it wasn't head on, but rather hit me along the sides. If it had been a container, it would have probably pierced the hull along the forward quarters. It is possible to build a boat like a tank, but it would be expensive and sail like the Merrimac or Monitor. Doug ps. That would be "Bobstay" or "Robertstay" :) "Daniel E. Best" wrote in message news:wgAvb.271838$Fm2.285478@attbi_s04... It's frequently called the "Bob Stay" - dunno who bob is/was. I've always wondered why they didn't mold 6" worth of bumber along the stem out of that same high density rubber they make auto bumbers out of. It could be faired into the hull so that it would have a minimal effect on drag. My understanding is that by distributing the impact onto perhaps a square foot of the strongest portion of the hull, it would prevent major damage when striking the object with the stem (which I assume would be the most likely initial point of contact, as opposed to a glancing blow along the topsides or some such. - Dan Rufus wrote: For boats w/out a bowsprit, a good thick strip of SS, say 3/16 x 1 (or 1-1/2), running down the stem from below the forestay fitting to the curve of the forefoot would help reduce damage. Would also help when indulging in a little "Chicago parking" into concrete docks at a couple knots... g Bowsprits usually have a stay (correct name escapes me at the moment) down to the water line. In this case you could run the SS strip from the lower end of the stay down the forefoot, but if you charged into anything above the water, you'd catch 'sprit stay. Probably the strip would still help, though. Rufus Jeff Morris wrote: Avoidance strategies might reduce the odds of collision somewhat, but not enough to consider the risk eliminated. Radar, for instance, might work in some conditions, but not all. This leaves two approaches: one, which has been discussed, is preparing to handle the damage efficiently. I'd be curious what percentage of collision damages event can be handled with a collision mat, and how many required abandoning ship. Clearly, when the damage is too severe, most vessels will sink like the proverbial stone, but there are certain levels of damage where a mat will save the day. The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage, since they don't have the dead weight of the keel, and the hulls are shaped to facilitate flotation chambers. But any relatively light vessel can be made reasonably unsinkable. One can make a case that floatation bags are a better investment than a liferaft. -- Dan Best - (707) 431-1662, Healdsburg, CA 95448 B-2/75 1977-1979 Tayana 37 #192, "Tricia Jean" http://rangerbest.home.comcast.net/TriciaJean.JPG |
Technique for avoiding collision with floating debris......
Bumber? Most boats aren't designed with the assumption that
the captain runs into thing all the time. When a collision does occur, it is not always straight on. The few times I have bumped on a log or other junk, it wasn't head on, but rather hit me along the sides. If it had been a container, it would have probably pierced the hull along the forward quarters. It is possible to build a boat like a tank, but it would be expensive and sail like the Merrimac or Monitor. Doug ps. That would be "Bobstay" or "Robertstay" :) "Daniel E. Best" wrote in message news:wgAvb.271838$Fm2.285478@attbi_s04... It's frequently called the "Bob Stay" - dunno who bob is/was. I've always wondered why they didn't mold 6" worth of bumber along the stem out of that same high density rubber they make auto bumbers out of. It could be faired into the hull so that it would have a minimal effect on drag. My understanding is that by distributing the impact onto perhaps a square foot of the strongest portion of the hull, it would prevent major damage when striking the object with the stem (which I assume would be the most likely initial point of contact, as opposed to a glancing blow along the topsides or some such. - Dan Rufus wrote: For boats w/out a bowsprit, a good thick strip of SS, say 3/16 x 1 (or 1-1/2), running down the stem from below the forestay fitting to the curve of the forefoot would help reduce damage. Would also help when indulging in a little "Chicago parking" into concrete docks at a couple knots... g Bowsprits usually have a stay (correct name escapes me at the moment) down to the water line. In this case you could run the SS strip from the lower end of the stay down the forefoot, but if you charged into anything above the water, you'd catch 'sprit stay. Probably the strip would still help, though. Rufus Jeff Morris wrote: Avoidance strategies might reduce the odds of collision somewhat, but not enough to consider the risk eliminated. Radar, for instance, might work in some conditions, but not all. This leaves two approaches: one, which has been discussed, is preparing to handle the damage efficiently. I'd be curious what percentage of collision damages event can be handled with a collision mat, and how many required abandoning ship. Clearly, when the damage is too severe, most vessels will sink like the proverbial stone, but there are certain levels of damage where a mat will save the day. The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage, since they don't have the dead weight of the keel, and the hulls are shaped to facilitate flotation chambers. But any relatively light vessel can be made reasonably unsinkable. One can make a case that floatation bags are a better investment than a liferaft. -- Dan Best - (707) 431-1662, Healdsburg, CA 95448 B-2/75 1977-1979 Tayana 37 #192, "Tricia Jean" http://rangerbest.home.comcast.net/TriciaJean.JPG |
Technique for avoiding collision with floating debris......
"Jeff Morris" wrote in The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage This didn't help the racing multi "Bullfrog Sunblock". Sailing from Auckland New Zealand to Australia it hit a submerged object ,thought to be a shipping container . It tore out the center hull and sank like a stone.Luckily the crew was out on deck at the time and survived if the had been in their bunks who knows. I have read about "forward looking sonar" , it'd be a hell of a drain on the batteries to have it on all the time. Neil C |
Technique for avoiding collision with floating debris......
"Jeff Morris" wrote in The third approach is to reduce the odds of the vessel sinking, with positive floatation and/or collision bulkheads. Multihulls have an advantage This didn't help the racing multi "Bullfrog Sunblock". Sailing from Auckland New Zealand to Australia it hit a submerged object ,thought to be a shipping container . It tore out the center hull and sank like a stone.Luckily the crew was out on deck at the time and survived if the had been in their bunks who knows. I have read about "forward looking sonar" , it'd be a hell of a drain on the batteries to have it on all the time. Neil C |
Technique for avoiding collision with floating debris......
How about:
"The Marine Committee of the NZ Insurance Council (http://www.icnz.org.nz) has been researching issues surrounding the dangers of lost shipping containers in New Zealand waters, particularly to smaller craft and modern fast passenger ferries. It is known that a significant number of lost containers in New Zealand waters are not reported. Some containers remain afloat, often below the surface, long enough to be a real hazard to shipping." http://www.veromarine.co.nz/dirvz/ma...otoFeature0007 wrote in message ... On Fri, 21 Nov 2003 17:23:41 -0800, Josh Assing wrote: while sailing. Stuff like containers that fell off of freighters will show up on RADAR. No matter what, there is never any substitute for paying attention. I not if they're submerged just below the surface.... Please speak in complete thoughts, and maybe even cite real life examples to support your claim that this could even happen. Thank you BB |
Technique for avoiding collision with floating debris......
How about:
"The Marine Committee of the NZ Insurance Council (http://www.icnz.org.nz) has been researching issues surrounding the dangers of lost shipping containers in New Zealand waters, particularly to smaller craft and modern fast passenger ferries. It is known that a significant number of lost containers in New Zealand waters are not reported. Some containers remain afloat, often below the surface, long enough to be a real hazard to shipping." http://www.veromarine.co.nz/dirvz/ma...otoFeature0007 wrote in message ... On Fri, 21 Nov 2003 17:23:41 -0800, Josh Assing wrote: while sailing. Stuff like containers that fell off of freighters will show up on RADAR. No matter what, there is never any substitute for paying attention. I not if they're submerged just below the surface.... Please speak in complete thoughts, and maybe even cite real life examples to support your claim that this could even happen. Thank you BB |
Technique for avoiding collision with floating debris......
The waters cited are not prone to large swells, but I have been in a water
taxi late at night and seen the radar pick out logs and other debris on the water. It was overcast, poor visibility and moderately high wind at the time. Unfortunately, did not note manufacturer of unit. surfnturf "Doug Dotson" wrote in message ... Maybe on a dead calm sea. "Tom Dacon" wrote in message ... The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. This hasn't been my experience. In calm inner waters, such as the inland passage along the west coast of Canada, radar when set to short range can commonly pick up a log or the top of a deadhead if it breaks the water's surface, and it will routinely pick up a seagull standing on top of it. In fact, I've even seen it pick up the riffles from a tidal rip. Tom Dacon |
Technique for avoiding collision with floating debris......
The waters cited are not prone to large swells, but I have been in a water
taxi late at night and seen the radar pick out logs and other debris on the water. It was overcast, poor visibility and moderately high wind at the time. Unfortunately, did not note manufacturer of unit. surfnturf "Doug Dotson" wrote in message ... Maybe on a dead calm sea. "Tom Dacon" wrote in message ... The stuff is so low in the water that it can't be picked up by radar. A debris object would have to be nearly as large as your boat to set off any radar collision alarm.. This hasn't been my experience. In calm inner waters, such as the inland passage along the west coast of Canada, radar when set to short range can commonly pick up a log or the top of a deadhead if it breaks the water's surface, and it will routinely pick up a seagull standing on top of it. In fact, I've even seen it pick up the riffles from a tidal rip. Tom Dacon |
Technique for avoiding collision with floating debris......
It was a complete thought. Perhaps not a complete and proper sentence. I supposed I assumed too much about the audience and understanding radar and the subject of the thread.... real live story: We were sailing off the coast of mexico on a 27' Santana, equipped with radar, we noticed a some logs, so we went further west. This was in about 1989 or so. It with my college buddy Dave; it was his boat; the boat was blue; it had new sails old motor. as we went further west, the radar was clear and we went down below for something to eat. that's when we felt the crunch. and the boat stop moving. and the water coming in. Coast guard found it.. it was 1' under the surface, sometimes bobbing up to the surface. There is NO WAY a radar an find anything underwater. And if you set it so sensitive that a log is spotted, well then waves & swells will probably trigger it off from time to time. On Sat, 22 Nov 2003 01:31:19 GMT, wrote: On Fri, 21 Nov 2003 17:23:41 -0800, Josh Assing wrote: while sailing. Stuff like containers that fell off of freighters will show up on RADAR. No matter what, there is never any substitute for paying attention. I not if they're submerged just below the surface.... Please speak in complete thoughts, and maybe even cite real life examples to support your claim that this could even happen. Thank you BB |
Technique for avoiding collision with floating debris......
It was a complete thought. Perhaps not a complete and proper sentence. I supposed I assumed too much about the audience and understanding radar and the subject of the thread.... real live story: We were sailing off the coast of mexico on a 27' Santana, equipped with radar, we noticed a some logs, so we went further west. This was in about 1989 or so. It with my college buddy Dave; it was his boat; the boat was blue; it had new sails old motor. as we went further west, the radar was clear and we went down below for something to eat. that's when we felt the crunch. and the boat stop moving. and the water coming in. Coast guard found it.. it was 1' under the surface, sometimes bobbing up to the surface. There is NO WAY a radar an find anything underwater. And if you set it so sensitive that a log is spotted, well then waves & swells will probably trigger it off from time to time. On Sat, 22 Nov 2003 01:31:19 GMT, wrote: On Fri, 21 Nov 2003 17:23:41 -0800, Josh Assing wrote: while sailing. Stuff like containers that fell off of freighters will show up on RADAR. No matter what, there is never any substitute for paying attention. I not if they're submerged just below the surface.... Please speak in complete thoughts, and maybe even cite real life examples to support your claim that this could even happen. Thank you BB |
Technique for avoiding collision with floating debris......
If.....radar was THAT sensitive then why was I, sailing a 43 footer, nearly
run over by a tanker in the English Channel between Flushing and Lowestoft? The weather was stormy, rainy and it happened in the middle of the night during a downpour! And....vessels are not on auto pilot in that location. Radar is a tool, but it does not replace common sense ;-) -- c ya Wim www.cruising.ca/thousand/f-index.html "surfnturf" wrote in message news:xlMvb.461044$pl3.204000@pd7tw3no... : The waters cited are not prone to large swells, but I have been in a water : taxi late at night and seen the radar pick out logs and other debris on the : water. It was overcast, poor visibility and moderately high wind at the : time. : : Unfortunately, did not note manufacturer of unit. : : surfnturf : : "Doug Dotson" wrote in message : ... : Maybe on a dead calm sea. : : "Tom Dacon" wrote in message : ... : : : The stuff is so low in the water that it can't be picked up by radar. : A : debris object would have to be nearly as large as your boat to set off : any : radar collision alarm.. : : : This hasn't been my experience. In calm inner waters, such as the inland : passage along the west coast of Canada, radar when set to short range : can : commonly pick up a log or the top of a deadhead if it breaks the water's : surface, and it will routinely pick up a seagull standing on top of it. : In : fact, I've even seen it pick up the riffles from a tidal rip. : : Tom Dacon : : : : : : |
Technique for avoiding collision with floating debris......
If.....radar was THAT sensitive then why was I, sailing a 43 footer, nearly
run over by a tanker in the English Channel between Flushing and Lowestoft? The weather was stormy, rainy and it happened in the middle of the night during a downpour! And....vessels are not on auto pilot in that location. Radar is a tool, but it does not replace common sense ;-) -- c ya Wim www.cruising.ca/thousand/f-index.html "surfnturf" wrote in message news:xlMvb.461044$pl3.204000@pd7tw3no... : The waters cited are not prone to large swells, but I have been in a water : taxi late at night and seen the radar pick out logs and other debris on the : water. It was overcast, poor visibility and moderately high wind at the : time. : : Unfortunately, did not note manufacturer of unit. : : surfnturf : : "Doug Dotson" wrote in message : ... : Maybe on a dead calm sea. : : "Tom Dacon" wrote in message : ... : : : The stuff is so low in the water that it can't be picked up by radar. : A : debris object would have to be nearly as large as your boat to set off : any : radar collision alarm.. : : : This hasn't been my experience. In calm inner waters, such as the inland : passage along the west coast of Canada, radar when set to short range : can : commonly pick up a log or the top of a deadhead if it breaks the water's : surface, and it will routinely pick up a seagull standing on top of it. : In : fact, I've even seen it pick up the riffles from a tidal rip. : : Tom Dacon : : : : : : |
Technique for avoiding collision with floating debris......
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Technique for avoiding collision with floating debris......
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