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Mast head lock |
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batman 
Newbie 
Joined: 14 Jan 13 Online Status: Offline Posts: 12 |
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 Topic: Mast head lockPosted: 14 Jan 13 at 3:06pm |
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Main halyard lock at the mast head. The main benefit I believe is that they take the compression out of the mast. I'm not an engineer- what practical benefits will I feel on a Fireball? Some sailors are swapping to them and I know 470s use them- but at a cost of around £80 and some fitting work is it worth it? The jib halyard has a 2:1 at the top so the load on that is halved- but isnt this putting the rig under far compression that a main halyard would?
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SoggyBadger
Really should get out more 
Joined: 26 Oct 10 Location: The Wild Wood Online Status: Offline Posts: 552 |
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Posted: 14 Jan 13 at 4:01pm |
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It's not just compression. In the normal situation where the halyard is made fast at the base of the mast somewhere when the mast bends the distance head to heel reduces so the halyard slackens and the main comes down a bit.
Edited by SoggyBadger - 14 Jan 13 at 4:02pm |
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Best wishes from deep in the woods
SB |
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maxibuddah
Really should get out more
Joined: 06 Mar 09 Location: United Kingdom Online Status: Offline Posts: 1760 |
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Posted: 14 Jan 13 at 4:33pm |
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No or very low stretch in the halyard as well.
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Everything I say is my opinion, honest
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JimC
Really should get out more
Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 14 Jan 13 at 5:21pm |
Which is why certain classes don't use jib halyards. The compression puts extra bend in a mast. Provided that the mast stiffness is correct with the halyard loads this is not that much of an issue, but you should be able to use a lighter or more flexible section without halyard compression. I have an excessively bendy topmast on my IC for my current waistline, and putting a main halyard lock on made a very substantial difference to keeping the rig powered up. If your rig is over bending then a halyard lock may help. If its already on the stiff side then a halyard lock will probaby make things worse! Edited by JimC - 14 Jan 13 at 5:22pm |
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Jack Sparrow
Really should get out more
Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965 |
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Posted: 14 Jan 13 at 5:41pm |
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more on the subject here: http://www.boatdesign.net/forums/boat-design/halyard-locks-reduce-mast-compression-5968.html
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winging it
Really should get out more
Joined: 22 Mar 07 Online Status: Offline Posts: 3958 |
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Posted: 14 Jan 13 at 6:44pm |
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I am tempted to do this on my contender. The wire halyard is fraying and keeps jamming in the sheave at the top. I know the sheave will need replacing anyway, but this sort of stuff is so much easier with a decent line and an external halyard. Good or bad idea on this class of boat? it's a carbon spar.
edited to say if yes what line would be best? Edited by winging it - 14 Jan 13 at 6:45pm |
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the same, but different...
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PeterG
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Joined: 12 Jan 08 Location: United Kingdom Online Status: Offline Posts: 822 |
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Posted: 14 Jan 13 at 7:07pm |
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I had a discussion about this recently, in relation to being able to seal the mast on a Contender and make a slight improvement to the rate of inversion. That would be a benefit, but a negative that was pointed out to me was that, sailing as we do from an exposed beach, there are times (thankfully rare) when you can get caught out by a rising onshore wind and break on the beach, when it's very useful to be able to part lower the main. Messing around on the foredeck in those conditions trying to unlock your main might prove a bit interesting! OTOH, if you sail mainly on ponds then it probably shouldn't be an issue.
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Peter
Ex Cont 707 Ex Laser 189635 DY 59 |
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robin34024
Posting king 
Joined: 03 Jan 12 Location: Lincoln Online Status: Offline Posts: 116 |
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Posted: 14 Jan 13 at 7:39pm |
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i have seen people with a cleat at the bottom of the mast too, so you can part lower the sail without too much fuss.
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Bootscooter
Really should get out more
Joined: 15 May 07 Location: United Kingdom Online Status: Offline Posts: 1094 |
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Posted: 14 Jan 13 at 8:00pm |
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My new (to me) OK has a halyard clip at the base of the mast - blue-top needlespar to fairly stiff, and a sail cut to match. Presumably if I changed it to a clip up the top it'd change the bend characteristics and mess up the sail?
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tick
Far too distracted from work 
Joined: 16 Nov 12 Online Status: Offline Posts: 223 |
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Posted: 14 Jan 13 at 8:10pm |
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On the C2 Byte there is an open cleat at the mast head. Just locate the halyard in it and cleat. To release just stand at the front of the boat and flick it out. It can jam if you use too much cunningham however.
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