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Is a carbon boom worth it?
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coachg



Joined: 10 Sep 2000
Posts: 2026

PostPosted: Mon Aug 04, 2014 2:32 pm    Post subject: Reply with quote

swchandler wrote:
There is less likelihood of water getting inside the front boom arms, but you still can't escape the fact that aluminum is subject to stress fatigue.


Agreed. But I don't think Keycocker was arguing against that, I think he was pointing out that if you can't visually tell the difference between painted aluminum & Carbon, you are unlikely to feel the fatigue.

Coachg
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dennis_c



Joined: 05 May 1998
Posts: 656
Location: Rio

PostPosted: Tue Aug 05, 2014 9:12 am    Post subject: Reply with quote

whitevan01 wrote:
Also, the Chinook carbon booms (for the same size) are a fair bit lighter than the MS.

Those MS front ends are stiff but heavy.
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spennie



Joined: 13 Oct 1995
Posts: 867
Location: Thousand Oaks, CA

PostPosted: Tue Aug 05, 2014 10:51 am    Post subject: Reply with quote

I was told that one of the big differences is that carbon fiber doesn't fatigue like metal does. Maybe one of you engineer types can confirm or deny that for us. I tend to believe it, because I have 15-year-old carbon booms that are just fine, albeit a bit tattered, and 'm a big guy (215) who sails a lot, on big sails.

So if you pay twice as much, but it lasts 4 times as long, you're saving money! That's what I tell my wife anyway.

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allen



Joined: 13 Aug 1996
Posts: 220

PostPosted: Tue Aug 05, 2014 1:04 pm    Post subject: Reply with quote

Spennie,

Carbon will also fatigue but it is the accumulation of load cycles on corroded aluminum that is the problem. And fresh water rinses will not prevent corrosion in alum booms used in salt water.
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isobars



Joined: 12 Dec 1999
Posts: 14632

PostPosted: Tue Aug 05, 2014 1:22 pm    Post subject: Reply with quote

Not even with disassembly and complete flushing?
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swchandler



Joined: 08 Nov 1993
Posts: 6034

PostPosted: Tue Aug 05, 2014 1:58 pm    Post subject: Reply with quote

"Not even with disassembly and complete flushing?"



You're kidding right? The problem isn't as simple as removing the extension and rinsing the everything. Even on monocoque aluminum booms, if saltwater gets past the internal plugs in the boom arms, and it ultimately will, you're cooked.
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stevenbard



Joined: 11 Nov 1993
Posts: 4344

PostPosted: Tue Aug 05, 2014 2:51 pm    Post subject: Reply with quote

I'm afraid of using aluminum because in the old days I broke too many due to fatigue. Carbon booms are stiffer, lighter and will not corrode or fatigue as much as aluminum.

I've only broken one carbon boom (at mast high Hookipa). Luckily it broke, because I was hooked in!!
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kevinkan



Joined: 07 Jun 2001
Posts: 1169
Location: San Francisco

PostPosted: Fri Aug 08, 2014 3:22 am    Post subject: Reply with quote

dennis_c wrote:

Those MS front ends are stiff but heavy.


Inquiring minds want to know... especially at ~1:30 in the morning

I just weighed some boom heads and here are the results:

RDM or w/ RDM adaptor
Streamlined 387g
Simmer (HPL Pro Variant) 452g
Chinook Pro-1 488g
Maui Sails 521g

SDM
Streamlined 391g
Maui Sails 395g
Simmer 395g
Chinook Pro-1 399g

As far as stiffness goes, I rank them from stiffest to least stiff:
1-Streamlined
2-Maui Sails
3-Chinook Pro-1
4-Simmer

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isobars



Joined: 12 Dec 1999
Posts: 14632

PostPosted: Fri Aug 08, 2014 7:51 am    Post subject: Reply with quote

kevinkan wrote:
I just weighed some boom heads and here are the results:

Lightest: Streamlined @ 387g

Stiffest: Streamlined


Yet I gave up trying to sell two barely used Streamlined booms. Very few people recognized the brand, and people expected to get barely-used carbon booms for $200.
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whitevan01



Joined: 29 Jun 2007
Posts: 510

PostPosted: Fri Aug 08, 2014 9:31 am    Post subject: Reply with quote

kevinkan wrote:
dennis_c wrote:

Those MS front ends are stiff but heavy.


As far as stiffness goes, I rank them from stiffest to least stiff:
1-Streamlined
2-Maui Sails
3-Chinook Pro-1
4-Simmer


What testing did you do to determine relative stiffness?
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