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Best spinnaker halyard line material?
by Karl_Brogger. 12/29/24 05:14 PM
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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 Offline OP
old hand
erice  Offline OP
old hand

Joined: Sep 2007
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
-- Have You Seen This? --
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 Offline
veteran
Tornado  Offline
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 Offline
Carpal Tunnel
Mark Schneider  Offline
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 Offline OP
old hand
erice  Offline OP
old hand

Joined: Sep 2007
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

Moderated by  Damon Linkous 

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