View previous topic :: View next topic |
Author |
Message |
coachg
Joined: 10 Sep 2000 Posts: 3553
|
Posted: Mon Aug 04, 2014 2:32 pm Post subject: |
|
|
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 |
|
Back to top |
|
|
Arrgh
Joined: 05 May 1998 Posts: 864 Location: Rio
|
Posted: Tue Aug 05, 2014 9:12 am Post subject: |
|
|
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. |
|
Back to top |
|
|
spennie
Joined: 13 Oct 1995 Posts: 975 Location: Thousand Oaks, CA
|
Posted: Tue Aug 05, 2014 10:51 am Post subject: |
|
|
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. _________________ Spennie the Wind Junkie
www.WindJunkie.net |
|
Back to top |
|
|
allen
Joined: 13 Aug 1996 Posts: 237
|
Posted: Tue Aug 05, 2014 1:04 pm Post subject: |
|
|
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. |
|
Back to top |
|
|
isobars
Joined: 12 Dec 1999 Posts: 20935
|
Posted: Tue Aug 05, 2014 1:22 pm Post subject: |
|
|
Not even with disassembly and complete flushing? |
|
Back to top |
|
|
swchandler
Joined: 08 Nov 1993 Posts: 10588
|
Posted: Tue Aug 05, 2014 1:58 pm Post subject: |
|
|
"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. |
|
Back to top |
|
|
MalibuGuru
Joined: 11 Nov 1993 Posts: 9300
|
Posted: Tue Aug 05, 2014 2:51 pm Post subject: |
|
|
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!! |
|
Back to top |
|
|
kevinkan
Joined: 07 Jun 2001 Posts: 1661 Location: San Francisco
|
Posted: Fri Aug 08, 2014 3:22 am Post subject: |
|
|
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 _________________ Kevin Kan
Sunset Sailboards, San Francisco CA
http://www.sunsetsailboards.com
https://www.instagram.com/sunsetsailboards
http://www.facebook.com/sunsetsailboards |
|
Back to top |
|
|
isobars
Joined: 12 Dec 1999 Posts: 20935
|
Posted: Fri Aug 08, 2014 7:51 am Post subject: |
|
|
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. |
|
Back to top |
|
|
whitevan01
Joined: 29 Jun 2007 Posts: 607
|
Posted: Fri Aug 08, 2014 9:31 am Post subject: |
|
|
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? |
|
Back to top |
|
|
|
|
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum You can attach files in this forum You can download files in this forum
|
|
|