GIULIETTA's BROKE MY BOOM!!!!!!!! ouch!!!!! - Page 3 - SailNet Community
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post #21 of 67 Old 03-23-2007
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Some people claim a winged keel makes the boat go faster, so maybe a winged boom will too.
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post #22 of 67 Old 03-23-2007
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Quote:
Originally Posted by PBzeer
kananumpua - a preventer, also called a boom brake, basically limits the amount of travel the boom makes from one side to the other. Someone else may have a more technical explaination for you.
Doesn't the main sheet do that?
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post #23 of 67 Old 03-23-2007
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Not what we like to see Bluebottle old friend. Nasty ouch indeed.

Andrew B (Malö 39 Classic)

“Life is a trick, and you get one chance to learn it.”
― Terry Pratchett.
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post #24 of 67 Old 03-23-2007
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skrap - the preventer is used when you have the main swung way out, to stop it short of swinging the full distance to the other side. The mainsheet doesn't do that.

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Full, is the spirit, that thinks not, of falling.
True, is the soul, that hesitates not, to give.
Alive, is the one, that believes, in love.
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post #25 of 67 Old 03-23-2007
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Quote:
Originally Posted by skrap1r0n
Doesn't the main sheet do that?
Not if you've got the sheet out, say on a downwind. It prevents the boom from coming all the way over on an accidental jibe and knocking you out and off the boat(and breaking other things too).

Oops, PB beat me to it.

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post #26 of 67 Old 03-23-2007
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ok got it, I looked them up, I have a better understanding now.
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post #27 of 67 Old 03-23-2007
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Looks like aluminum to me. Time to go big bucks with the carbon Giu.

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post #28 of 67 Old 03-23-2007
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Sorry to hear that my friend. Good to hear that Fred kept a cool head so you could get things jury rigged.

Charlie

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post #29 of 67 Old 03-23-2007
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Sorry to hear about your trouble G. bummer
On the bright side eveyone is Ok, and now you can get a proper cruising boom.
http://www.leisurefurl.co.nz/leisurefurl.html


they even come in carbon fiber so your friends wont laugh at you

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post #30 of 67 Old 03-24-2007
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Preventers and boom brakes serve similar functions but do it quite differently.

A boom brake is designed to slow the boom, if the boat gybes. It does not stop the boom from crossing over the centerline, but is designed to slow the speed at which it can do it... removing most of the risk of an accidental gybe. A common brand of a boom brake is the dutchman boom brake, which you can see here.

A preventer is usually a line that is run forward to a padeye or chainplate, and prevents the boom from swinging across the boat. Here is a diagram of a preventer setup on San Juan 23.




The main difference between a boom brake and a preventer is that the preventer needs to be manually released to allow the boom to gybe—the boom brake does not. There are a few risks to using a preventer which a boom brake seems to avoid.

First, there is a greater risk of breaking the boom with a preventer, rather than a boom brake, since the preventer has far less give than the boom brake, which allows movement of the boom.

Second, there is the risk in the case of a broach of the main backing and filling on the wrong side of the boat. This can allow the main to pin the boat down. Not exactly an ideal situation.

BTW, I have a Dutchman Boom Brake on my boat.

Sailingdog

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