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'Wedgie' anchor sail


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#1 muzled

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Posted 16 June 2019 - 04:59 PM

Anyone use one of these?

 

http://www.mysailing...r-boat-a-wedgie

 

However, it was on that very first meeting that Keith gave us one priceless piece of information when he told us of the need for a two-wing wedge riding sail in these wild waters. Riding sails have been used for hundreds of years to stabilise boats at anchor to prevent, or at least lessen, the sheering motion that can develop as the wind picks up. This maddening and potentially dangerous anchor dance affects some yachts more than others, especially lighter, faster modern hull designs. But as wind speed increases even boats that normally lie well will eventually start to sheer. Gecko was no exception and tongue in cheek we rated her as a six out of ten on our 'international sheering scale' standardised to a force eight gale.

This sheering motion can be wearing on the nerves and tiring especially when it becomes violent with the boat rolling savagely to leeward as it is jerked back around at the end of the 'tack'. Yet a far more dangerous possibility is sheering's potential to break out even well set anchors.

Traditionally a ketch would hoist the mizzen to achieve the aim of holding the boat bow into the wind. Other techniques to reduce sheering are setting two anchors, an anchor or drogue hung off the anchor chain in the bow, a line from abeam to the anchor chain to offset the angle of attack, a bucket or drogue hung off the stern, or even anchoring stern to! None of these techniques are particularly efficient. Some even seem like acts of pure desperation while others are unseamanlike, being positively dangerous should a dragging anchor need to be urgently hauled and redeployed.

Keith had come up with his elegant solution to the sheering problem many years ago on the Orkney Islands during a force 10 North Atlantic gale in Scapa Flow. He had hoisted the mizzen of his ketch to steady the boat but, as the wind speed increased, the sail began to flog violently until it literally exploded. His solution was to jury rig the storm jib as a two-wing wedge riding sail off the backstay.

Keith quickly sketched the rig for us and, on the morrow, rowed over again to help set up our storm jib as a 'wedgie'. Subsequent gales saw us increasingly proficient at rigging the sail, which held Gecko steady when normally she would have been sheering wildly.

It was during one force nine gale, when we were moored upwind of two other yachts, that the full impact of the technique became obvious. With our wedgie rigged in the stern we watched as our neighbour started to sheer violently from side to side. The next day they came over to ask how that “funny sail” worked, as the motion on their boat had been so bad they had been forced ashore


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#2 Jon

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Posted 16 June 2019 - 06:00 PM

I’ve seen a few set around the world, usually British flagged boats
Many norther European boats often deploy a stern anchor automatically as if it’s what you must do, looks funny in the Marquises where the wind swings from sea to land breeze twice a day and the rest of us swing and lay the other way.
Interesting how people from different parts of the world automatically go to an anchoring mode irrespective of the conditions, just like this what we do so we do it regardless of if there’s no wind or it’s blowing a gale.
I find letting out shed loads of chain stops my boat from doing this, however this isn’t that great in crowded or small anchorage’s
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The best sailors do it two handed

#3 Addem

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Posted 17 June 2019 - 09:53 PM

Fantastic.

I’ve hated the hunting at anchor for decades now. My Challenge 29 was truly awful in this regard. Best I’ve managed is when the rode is deployed from the prod of our Elliot 10.5.

I’ve tried making little sails to deploy from the topping off the back of the boom but it’s never really worked because it’s impossible to control the ‘luff’.

Is there any detail on how to design one of these?
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#4 eruptn

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Posted 17 June 2019 - 10:17 PM

As a ex Ross owner, I found a small sea anchor on the bow stopped a lot of the anchor sailing.


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Ross 650 Farr 940


#5 Ladyhawk

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Posted 18 June 2019 - 08:39 AM

Lets see if this works, these pics are from the book mentioned in the article in muzled's post above.

 

 

1069218760.jpg

1069218825.jpg1069218866.jpg1069218910.jpg1069218945.jpg


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#6 Addem

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Posted 18 June 2019 - 04:40 PM

That’s brilliant thanks LH. I’ll come over with a beer some time.
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#7 harrytom

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Posted 18 June 2019 - 05:11 PM

Lou Tercel with "Ranger" many years ago made a statement.  Ranger never swings.

 

According to Lou everyone else did??

 

A friend had an older style ketch and use to leave mizzen up at anchor,worked fine.


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The boss said "see you in the morning"didnt know he liked sailing


#8 BOIGuy

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Posted 18 June 2019 - 07:39 PM

Managed to get quite a bit of room around me at New Years after the neighbors saw how much my boat sailed around at anchor. Launch would park up watch my boat do a few windward leewards, sometimes with offset mark, nek minnit they up and off, brilliant.

Left the boom tent up during a couple of days of good 25 knots at the barrier, boat didn't move, wouldn't want to try it in a storm but I certainly been thinking about making a riding sail, seen them work on other yachts too.


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#9 marinheiro

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Posted 19 June 2019 - 08:29 PM

Banner Bay in USA produce the wedge riding sails

https://www.bannerba...uct_detail&p=25


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#10 funlovincriminal

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Posted 19 June 2019 - 09:13 PM

My 830 was faster upwind at anchor than when underway
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