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#1
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Uhm, maybe for your boat. In fact, just last weekend I was anchored
out in 30 gusting 45 and neither chain+rope rode was bar-taut. The point still holds, in heavy weather conditions, when things are at their worst, an all chain rode or a chain/rope rode will be stretched taut and a kettle will do no good. Paul "Amgine" wrote in message om... "Jim Donohue" wrote in message news:X2Uid.82404$bk1.80735@fed1read05... The problems is that above 35 knots of wind or so you have a straight rode. Uhm, maybe for your boat. In fact, just last weekend I was anchored out in 30 gusting 45 and neither chain+rope rode was bar-taut. On the other hand, I was wishing I had a bit more chain on both because I didn't have quite enough out for the weather (7:1 on a 7.5kg Bruce, and 5:1 on a 25lb. CQR) as I'd anchored 8 hours before the peak of the blow. To get a reasonable amount of shock absorption with all-chain, use a chain hook on about 30-40' of light nylon laid line and veer out a few more feet of chain. You'll get all the spring you want, but if there's much fetch you don't want too slack a chain to save your bows from a beating. I've never used either a kellet or buoy, but I'd like to experiment with both. Who has used which? Amgine http://wiki.saewyc.net/ |
#2
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![]() "Amgine" wrote in message om... "Jim Donohue" wrote in message news:X2Uid.82404$bk1.80735@fed1read05... The problems is that above 35 knots of wind or so you have a straight rode. Uhm, maybe for your boat. In fact, just last weekend I was anchored out in 30 gusting 45 and neither chain+rope rode was bar-taut. On the other hand, I was wishing I had a bit more chain on both because I didn't have quite enough out for the weather (7:1 on a 7.5kg Bruce, and 5:1 on a 25lb. CQR) as I'd anchored 8 hours before the peak of the blow. To get a reasonable amount of shock absorption with all-chain, use a chain hook on about 30-40' of light nylon laid line and veer out a few more feet of chain. You'll get all the spring you want, but if there's much fetch you don't want too slack a chain to save your bows from a beating. I've never used either a kellet or buoy, but I'd like to experiment with both. Who has used which? Amgine http://wiki.saewyc.net/ See Complete Book of Anchoring and Mooring by Hinz page 113. On the ABYC hypothetical power boat of 45 feet and 15 foot beam the cantenary has 1 foot of "droop"per 100 feet of rode at 30 knots and 0 feet at 40 knots. If your boat is smaller and has a smaller section it may be a little higher. Hinz advocates the use of chain riding stoppers for all chain boats. He points out that all chain rodes are very good at parting or destroying something in high winds. They are also sufficiently noisey in high wind conditions to make sleep difficult. Jim Donohue |
#3
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Even more important than the "droop" is the limited (almost non-existent) extension
available to an all chain system. What its really needed is enough nylon to allow for 5 or 10 feet, or more, of stretch. "Jim Donohue" wrote in message news:rUtjd.90348$bk1.52418@fed1read05... "Amgine" wrote in message om... "Jim Donohue" wrote in message news:X2Uid.82404$bk1.80735@fed1read05... The problems is that above 35 knots of wind or so you have a straight rode. Uhm, maybe for your boat. In fact, just last weekend I was anchored out in 30 gusting 45 and neither chain+rope rode was bar-taut. On the other hand, I was wishing I had a bit more chain on both because I didn't have quite enough out for the weather (7:1 on a 7.5kg Bruce, and 5:1 on a 25lb. CQR) as I'd anchored 8 hours before the peak of the blow. To get a reasonable amount of shock absorption with all-chain, use a chain hook on about 30-40' of light nylon laid line and veer out a few more feet of chain. You'll get all the spring you want, but if there's much fetch you don't want too slack a chain to save your bows from a beating. I've never used either a kellet or buoy, but I'd like to experiment with both. Who has used which? Amgine http://wiki.saewyc.net/ See Complete Book of Anchoring and Mooring by Hinz page 113. On the ABYC hypothetical power boat of 45 feet and 15 foot beam the cantenary has 1 foot of "droop"per 100 feet of rode at 30 knots and 0 feet at 40 knots. If your boat is smaller and has a smaller section it may be a little higher. Hinz advocates the use of chain riding stoppers for all chain boats. He points out that all chain rodes are very good at parting or destroying something in high winds. They are also sufficiently noisey in high wind conditions to make sleep difficult. Jim Donohue |
#4
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"Jeff Morris" wrote in message ...
Even more important than the "droop" is the limited (almost non-existent) extension available to an all chain system. What its really needed is enough nylon to allow for 5 or 10 feet, or more, of stretch. See Complete Book of Anchoring and Mooring by Hinz page 113. On the ABYC hypothetical power boat of 45 feet and 15 foot beam the cantenary has 1 foot of "droop"per 100 feet of rode at 30 knots and 0 feet at 40 knots. If your boat is smaller and has a smaller section it may be a little higher. Hinz advocates the use of chain riding stoppers for all chain boats. He points out that all chain rodes are very good at parting or destroying something in high winds. They are also sufficiently noisey in high wind conditions to make sleep difficult. Jim Donohue I will look for the Hinz book. I can attest to the noise, though only rarely is it enough to keep me up (the waves and wind, on the other hand, keep me hopping on a breezy night.) IMO, from my experience using a *long* snubber of 30-40 foot of small nylon, a chain rode can be made quite springy. The only problem I had was pitching to a single anchor when I had too much slack in the chain. After listening to it beat up the bow for a couple minutes I hauled in most of the slack and things were great for the rest of the night, but the damage to gelcoat was already done and resulted in painting the entire topsides. Something I haven't tried, but a fellow club member does, is using an unusually small diameter line and a longer than usual scope. I have watched him anchor in a fairly open range with what I consider to be a grossly inadequate anchor on 3/8 nylon at about 8:1, with no problems. He claims the smaller diameter has a high enough breaking strength for the job, but is stretchier in the gusts/waves and thus both gentler to ride to and lower jerk loads to break the anchor out. Has anyone had any first-hand experience with Kellets or Buoys? Amgine http://wiki.saewyc.net/ |
#6
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To get a reasonable amount of shock absorption with all-chain, use a
chain hook on about 30-40' ... doesn't give all that much shock attenuation. much better is double triple that amount of nylon. specs of rope manufactureres give nylon stretch at least than about 4% (many writers/posters who didn't bother read the spec sheets talk of 15% to 25% stretch, but the line won't go that except sometimes under breaking conditions), except for special mountain climbing ropes and "plait". ... of light nylon laid line and veer out a few more feet of chain. |
#7
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Actually neither the ball no the kellet has any effect in extreme
conditions. I have seen mooring balls work just fine in upwards of sustained storm force winds. HEAVY kellets (25# each, and often two or three on a rode) are sometimes used to overcome the inherent dangers of an all chain rode, at least up to 35+ knots of wind, then chain and nylon is used. |
#8
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#9
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"Wayne.B" wrote in message
... .... How many kellets, and how much nylon rode, do they use on a supertanker? Or the QE2? They don't turn their engines off in a blow either. Paul |
#10
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They use their hats when a blow is expected. They put them on and leave.
Simple. If you don't understand that metaphor, think "searoom" From: Wayne.B Date: 11/10/2004 9:31 AM Eastern Standard Time Message-id: On 10 Nov 2004 00:26:11 GMT, (JAXAshby) wrote: HEAVY kellets (25# each, and often two or three on a rode) are sometimes used to overcome the inherent dangers of an all chain rode, at least up to 35+ knots of wind, then chain and nylon is used. =================================== How many kellets, and how much nylon rode, do they use on a supertanker? Or the QE2? |
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