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| pro's - con's alloy boom to carbon w/surf mast #126293 12/14/07 03:21 AM 12/14/07 03:21 AM |
Joined: Sep 2007 Posts: 757 japan erice OP
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Posts: 757 japan | hi all, too cold to sail for the next 4 months so i'm tarting up my 25 year old cat
noticed that there is some minor corrosion around the rivets on the various fittings on the heavy alloy box section boom
not bad enough to require immediate replacement but i thought if next winter i was going to drill them out, clean up the corrosion and replace them it might be worth trialling a boom made from the bottom section of a busted carbon windsurfer mast
mainly for looks i guess:-)
comments?
eric e 1982 nacra 5.2 - 2158 2009 weta tri - 294
| | | Re: pro's - con's alloy boom to carbon w/surf mast
[Re: erice]
#126294 12/14/07 03:07 PM 12/14/07 03:07 PM |
Joined: Jul 2001 Posts: 1,200 Vancouver, BC Tornado
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veteran
Joined: Jul 2001
Posts: 1,200 Vancouver, BC | Should work fine...but no real gain other than weight. If you can afford the material, then go for it.
BTW, Carbon also corrodes steel, so use a sealant or other compound to reduce this affect.
Mike Dobbs Tornado CAN 99 "Full Tilt"
| | | Re: pro's - con's alloy boom to carbon w/surf mast
[Re: Tornado]
#126295 12/14/07 03:51 PM 12/14/07 03:51 PM |
Joined: Jun 2001 Posts: 3,116 Annapolis, MD Mark Schneider
Carpal Tunnel
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Carpal Tunnel
Joined: Jun 2001
Posts: 3,116 Annapolis, MD | It really depends on how you sheet the sail with your main sheet tackle.
Old style booms transfered the sheet load through the boom to the sail.
Most of the current sail designs use a strong gromet in the clew or webing sewn onto the leach of the sail at the clue.. The main sheet shackles to this point. The boom simply floats inside the webing. So... the boom's main job is to induce rotation of the mast and allow you to outhaul the sail.
You can now get away with a really light weight alluminum extusion... read cheap.. The down side is... If you stuff the boat and hit this lightweight boom... it will bend easily. Your new carbon boom will take more of a bump... hwoever, when it does fail... it won't bend... it will go boom!
On the A cat, the reason to go to a carbon boom is for the option of sheeting from the center of the boom of a large diameter and thus stiff carbon tube. There is not much advantage if you are rear sheeting (unless the boat is heavy)
The advantage of centering the sheeting point on the boat is that your pull is now inline with your body while on the wire... The sheet load is not across your body angled to the center of the traveler while you really want to be looking forward for puffs and waves. Besdes its much easier to pull this way for us old guys
Also, Make sure you manage the dissimilar materials when you put the fittings on.... they will deterioate rapidly and the new boom will give you no end of headache.
EG... be careful with a rivet... usually you want a backing washer gooped with the anticorrosive so that it doesn't deterioarte or pull through the carbon laminate when you pull the rivet.
crac.sailregattas.com
| | | Re: pro's - con's alloy boom to carbon w/surf mas
[Re: Mark Schneider]
#126296 12/14/07 04:05 PM 12/14/07 04:05 PM |
Joined: Sep 2007 Posts: 757 japan erice OP
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Posts: 757 japan | ooohhhh...
thanks guys, lots to study on carbon boomed a cats and to think about
eric e
eric e 1982 nacra 5.2 - 2158 2009 weta tri - 294
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