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Best rope for main halyard

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Medway Maniac View Drop Down
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Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 09 at 1:59pm

At least we're in total agreement, Peaky!

For 'floor' there, I guess you could substitute cleat?

Your 'ceiling' was my 'angel' in my earlier explanation. In each case it's the compression loading on the mast, as you say.

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Post Options Post Options   Quote Peaky Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 09 at 2:08pm

Absolutely right MM.  Angels sound much more poetic than celinings, but I couldn't draw an angel!

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Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 09 at 5:09pm
Sorry guys, but I still stand by the fact that if the sail is fully at the top of the mast you have lost your mechanical advantage and therefore the compressive load generated by the halyard is the same irrespective of whether you used a 2:1 to help pull the sail up or not.

I do however agree with the difference between these approaches and that of a mast top halyard lock.

The other thing to remember is that your compressive loads is not constrained as you have shown, as in effect the top of the mast can be considered to be spring jointed and not solidly contrained.
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Post Options Post Options   Quote Peaky Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 09 at 8:17pm

Hi Craiggo,

As you obviously know, the mechanical advantage you get depends on the angle the ropes leave the pulley at.  Anything less than 180 degrees will reduce the 2:1 to something less, but there will still be some advantage.

And your right, the mast tip is able to move, so that it is not fully constrained.  But again, most of the advantage will still be there.

Glad you agree on the mast top halyard lock!  Much easier with a rotating mast of course - another reason to sail a NS14!  Where you down at Chew for the RS Open last weekend?

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Post Options Post Options   Quote craiggo Quote  Post ReplyReply Direct Link To This Post Posted: 18 Mar 09 at 9:10pm
No I was supposed to be at the 700 open at Chew but I developed severe man flu towards the end of last week. I then suffered an allergic reaction to the man flu and developed urticaria, so a visit to the docs on Thursday provided me with some anti-hystamine and an appointment for a blood test.

I figured that sailin for a whole weekend could lay me low for a few days or even a week and I knew that this week was going to be a busy one at work so opted out.

I have to say the turnout sounded pretty disappointing, only 8 boats. Can only assume it was down to the poor forecast ie. Howling on Saturday and nothing on Sunday.

You ought to bring the NS14 to Thornbury Regatta on the last weekend in May, and get Chewy along as well. Hopefully the Cherub crowd will be along so could be a sociable weekend.

Paul
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Ross View Drop Down
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Post Options Post Options   Quote Ross Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 09 at 1:33am
Real boats don't use main halyards.
Ross
If you can't carry it, don't sail it!
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Post Options Post Options   Quote BBSCFaithfull Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 09 at 12:15pm
Exactly ross 
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Medway Maniac View Drop Down
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Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 09 at 12:17pm

Originally posted by Ross

Real boats don't use main halyards.

You can explain that to the next RIB driver who rescues you

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Peaky View Drop Down
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Post Options Post Options   Quote Peaky Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 09 at 12:25pm

Originally posted by Ross

Real boats don't use main halyards.

You mean a Laser, right?

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Post Options Post Options   Quote Andymac Quote  Post ReplyReply Direct Link To This Post Posted: 19 Mar 09 at 12:43pm
Originally posted by Peaky

Originally posted by Ross

Real boats don't use main halyards.

You mean a Laser, right?

Touche!  

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