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Harness line length, is 22 in. too short?
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yargerd



Joined: 05 May 2007
Posts: 31

PostPosted: Mon Nov 25, 2013 3:15 pm    Post subject: Reply with quote

Nothing in the previous comments indicates that line length had anything to do with the boom breaking... nothing. I'd bet that the amount of force seen by a boom with long lines in the same place and short lines spread a reasonable amount apart is well within the design limitations of a boom. Would a good boom designer make a boom that would likely fail under the circumstances pictured? No.

What brand of boom was that? How old is it? I have broken one boom at the center of harness lines. It was a no-name POS carbon boom. Now, I use proven carbon booms that are in good condition.
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scottwerden



Joined: 11 Jul 1999
Posts: 213

PostPosted: Tue Nov 26, 2013 4:08 pm    Post subject: Reply with quote

Engineering 101 - don't concentrate the load. Yes monolines will work some of the time or maybe even most of the time but you are increasing risk of breakage. I personally like to minimize risk. I really don't like swimming my gear in. But this has nothing to do with line length.
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isobars



Joined: 12 Dec 1999
Posts: 14227

PostPosted: Tue Nov 26, 2013 5:04 pm    Post subject: Reply with quote

yargerd wrote:
Nothing in the previous comments indicates that line length had anything to do with the boom breaking... nothing.

bwill808 wrote:
when I sailed the gorge with long lines overpowered, boom breaks


johnl wrote:
been using mono lines for over 3 years now ... don't think they can get much closer than that.....
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yargerd



Joined: 05 May 2007
Posts: 31

PostPosted: Tue Nov 26, 2013 7:43 pm    Post subject: Reply with quote

Engineering 201: Consider the load case and design for an appropriate factor of safety.

Countless mechanical systems have concentrated loadings. There is plenty of room in the design of a boom to make it suitable for monolines or closely spaced lines. I'll bet the high quality booms (Chinook, Maui-Sails) have tested this case. Doesn't mean you can hang a car on it. Doesn't mean it will never break. Booms have broken with lines a foot apart.

Point is, the logic here is nonsense: my old, used-up boom broke, it's because my lines were long. (?) Again, nothing in these comments indicates that line length had anything to do with the breakage. A boom could break for a trillion reasons. Iso, just because you quote a statement indicating that a person believes that their boom broke because their lines are long does not mean that the boom broke because their lines are long. Sillyness.
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isobars



Joined: 12 Dec 1999
Posts: 14227

PostPosted: Tue Nov 26, 2013 8:29 pm    Post subject: Reply with quote

You're agreeing with me. Silliness?
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westender



Joined: 02 Aug 2007
Posts: 633
Location: Portland / Gorge

PostPosted: Tue Nov 26, 2013 8:54 pm    Post subject: Reply with quote

If you had a line length to give you maximum power, enough to snap your boom,, That would be a good thing. I see many people needing extra power.
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isobars



Joined: 12 Dec 1999
Posts: 14227

PostPosted: Tue Nov 26, 2013 8:57 pm    Post subject: Reply with quote

SO many, including veteran WSers, that I am forced to assume that a large percentage of them enjoy slogging on small boards.
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johnl



Joined: 05 Jun 1994
Posts: 1176
Location: Hood River OR

PostPosted: Tue Nov 26, 2013 11:41 pm    Post subject: Reply with quote

Okay I have broken 3 booms. ALL with WIDE line placement. Since I have gone to mono lines I haven't broken one. By some of the logic used here, it is CLEARLY the wide placed lines fault.

Now I don't believe this for a second. BUT if you think the only force on a boom is at the line attachment (or the line length), then you clearly don't understand the loading of the boom. After all, the point of the attachment is not the only point of stress. And I can tell you where all three of them broke. Where the boom attaches to the boom head. Where a flexing object meets an inflexible attachment.

So do I worry about my mono lines breaking the boom? Not even for a second. Do I think at some point my boom will fail? Of course. I will then buy another. None of this gear lasts forever....
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kmf



Joined: 02 Apr 2001
Posts: 329

PostPosted: Wed Nov 27, 2013 1:11 pm    Post subject: Reply with quote

I broke a Chinook carbon gorge boom last year while sailing at swell city. I use mono lines, but the boom actually broke a foot behind the harness line attachment point, toward the clew. Of course I had purchased that particular boom at the Spring swap meet for $50.00, so in retrospect I figure that I got what I paid for. That is the only boom I have ever broken, of course that is the only boom that I have ever purchased used....from a guy who gave up windsurfing for kiting....it figures.

KMF
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scottwerden



Joined: 11 Jul 1999
Posts: 213

PostPosted: Wed Nov 27, 2013 1:24 pm    Post subject: Reply with quote

I have never broken a boom and I live/sail the gorge all summer and live/sail Maui the rest of the year. But I am not necessarily saying that has anything to do with line placement. However I am curious what type/manufacturer your booms are. I think that and sailing habits (like jumping while hooked in) have more to do with boom breakage than anything else.
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