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Old 22-09-2013, 21:20   #16
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Re: Does a sea anchor reduce rollovers?

oil helps flatten the seas...old timers would put oil in a leather bag and put a pin hole in it to drip oil on the leeward side to smooth out breaking waves coming their way...

wildly different effects depending on the sea...but in many cases it does help.
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Old 22-09-2013, 21:37   #17
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Re: Does a sea anchor reduce rollovers?

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Originally Posted by psneeld View Post
oil helps flatten the seas...old timers would put oil in a leather bag and put a pin hole in it to drip oil on the leeward side to smooth out breaking waves coming their way...

wildly different effects depending on the sea...but in many cases it does help.
Thanks. I have heard of that but didn't connect it with "oil bag" for some reason.
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Old 22-09-2013, 22:58   #18
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Re: Does a sea anchor reduce rollovers?

Racuflames Most of the ones Ive seen and used were 20 30 lbs of rags wrapped in heavy burlap, and soaked in oil with a bunch of heavy line to lash it aft in the water to smooth breaking water behind your boat in extreme weather, works best when your running with a storm downwind trailing warp or a droge. Theres lots of folks who say they don't work, but Ive used one a time or two and they worked for me ! just my old fashion ideas maybe!
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Old 23-09-2013, 00:53   #19
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Re: Does a sea anchor reduce rollovers?

At 11:45 A.M. the ship was overpowered by a terrific squall and lay nearly on her beam ends. I decided then that our best course of action was to get the ship before the wind under bare poles, with a small sea anchor streamed astern to steady her, and oil bags placed along both sides. Had we been in open waters she could have lain, as she wished, under bare poles with absolute safety; but the steepness and irregularity of the breaking seas made it essential, in my opinion, to keep her bow or stern on to them at all costs.
The sea anchor was bent to a 3 -inch warp and secured aft. Eight oil bags were filled with fish oil and placed along her sides, and knives were placed handy to cut away the trysail in case it jammed and left the ship temporarily out of control in a dangerous position.
Storms and Sea Anchors

Release oil
An old technique is to pour oil on the sea to reduce the breaking waves. Apart from the environmental considerations, few yachts would carry sufficient to have any effect. Although some people have reported success with pumping cooking oil out through the heads whilst lying ahull (hove to under bare poles).

The boat slowly slips to leeward leaving an oil slick and the extra surface tension of the oil on the surface reduces the tendency of the waves to windward to break and thus protects the boat.
Sailtrain: Seamanship, heavy weather conditions.
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Old 23-09-2013, 05:56   #20
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Re: Does a sea anchor reduce rollovers?

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What about the benefits from a drogue (sea anchor) of disturbing the upper water, such that the seas don't break? The Pardey's wrote about it in Storm Tactics.

I'd think that would be a big factor in preventing roll-overs.

Regards,
Brad
IMHO this would be a far fetched conclusion.

- the sea anchor must ride deep enough so that it does not get tangled and carried away by rolling seas - this will limit its ability to smooth seas,
- seriously breaking wave can be hundreds of yards wide - the sea anchor will be yards wide,
- the seas may break between you and the sea anchor - in fact white water that has just started breaking seems to be the most powerful one.

BTW people above who suggest using oil - are you topsides tall enough to avoid water covered with oil coming onboard? If not, think twice. I believe if such water/oil mixture comes onboard, you may find it very tricky to go on deck and carry out any job.

Just free floating musings and opinions of mine.

Cheers,
b.
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Old 23-09-2013, 06:07   #21
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pirate Re: Does a sea anchor reduce rollovers?

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Originally Posted by barnakiel View Post
IMHO this would be a far fetched conclusion.

- the sea anchor must ride deep enough so that it does not get tangled and carried away by rolling seas - this will limit its ability to smooth seas,
- seriously breaking wave can be hundreds of yards wide - the sea anchor will be yards wide,
- the seas may break between you and the sea anchor - in fact white water that has just started breaking seems to be the most powerful one.

BTW people above who suggest using oil - are you topsides tall enough to avoid water covered with oil coming onboard? If not, think twice. I believe if such water/oil mixture comes onboard, you may find it very tricky to go on deck and carry out any job.

Just free floating musings and opinions of mine.

Cheers,
b.
I concur... oily decks would be hell... just a few drops of diesel spill while topping up at sea can be dangerously slippy if water on the deck mixes with it... and when you consider a drogue/sea anchor needs to be at least two waves away its not gonna have much effect on any breaking waves...
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Old 24-09-2013, 17:13   #22
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Re: Does a sea anchor reduce rollovers?

Check-out The Venturesome Voyages of Captain Voss. Amongst other things, in 1901 he sailed around the world in the Indian dugout canoe, Tilikum.' He attributes surviving numerous storms and a typhoon to heaving to under sea anchor and riding sail. He made an extensive study including size and distance of the anchor. He also used oil bags, I think they used whale oil.
The Jordan site has some interesting links to more recent studies. I've not used either but it will be part of the safety gear when I return to the UK. Reckon could also be part of liferaft equipment would be great if it could double as a kite.
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Old 24-09-2013, 19:11   #23
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Re: Does a sea anchor reduce rollovers?

Read a book about Tilikum when I was a kid. I still am. That was truly inspirational.

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