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That Ken not Barber Hauler Jock Strap thing
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G.R.F. View Drop Down
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    Posted: 21 Feb 13 at 9:43am
So, trade shows over for a bit, I'm hoping to get back on the water and the last thing I wanted to sort out was that elasto strap thing that keeps the sail & boom out and forward when clew first downwind. Having a dementia riddled brain these days, I've completely lost the thread (as well as the plot) and forget which boat it was that I saw pictures of them using it, something I was probably ridiculing at the time. OK maybe?

So if anyone has one of these things, useful hints and tips, what size elastic, where do you fit it so it works both ways, judge the tension etc?

Oh and what it was called, Dan did give it a name, some initial like J strap after jock who invented it or similar..

Thanks in grateful anticipation, maybe you can stop beating up the furballers and exercise your brains for a bit..


Edited by G.R.F. - 21 Feb 13 at 9:48am
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rb_stretch View Drop Down
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Posts: 742 		Post Options Post Options   Quote rb_stretch Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 10:14am
Used on the Solos. It is normally tensionable as well.
 
BTW. I regularly race against the EPS that was at the Perisher and BM this year. He's a good sailor and has never found the need to use one as far as I can tell.
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Posts: 223 		Post Options Post Options   Quote tick Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 10:21am
Well my boy, sorry to say that Solo's have them. It's quite simple. A long bungee which passes through a pulley at the bow, round each side of the mast and attaches to the boom....or is the pulley on the boom....anyway, in theory it holds the boom out down wind when you are heeling to windward. It stops gravity hurling the boom across and removing your head. 

I have seen them tried on Lightnings but on boats without shrouds the boom can be shoved in front of the mast where gravity will keep it there anyway.

The OPS or what ever it's called only has lowers dosen't it and that rather natty bearing. Do they interfere with forward movement of the boom?
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transient View Drop Down
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Posts: 715 		Post Options Post Options   Quote transient Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 10:27am
Yep, OKs use them......Looks like a bit of 10mm



Edited by transient - 21 Feb 13 at 10:28am
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G.R.F. View Drop Down
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Posts: 4028 		Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 10:50am
Originally posted by rb_stretch

Used on the Solos. It is normally tensionable as well.
 
BTW. I regularly race against the EPS that was at the Perisher and BM this year. He's a good sailor and has never found the need to use one as far as I can tell.

Never met him but have followed his progress, hence feeling the need to do something about making the boat faster, this will solve a little problem I have in light weather, he, like me, got himself beaten by a Solo in light weather and that can never be allowed to happen again, following an incident I had after a late start and issues with the boom not staying forward.

No Solo should ever beat an EPS and be allowed to live.
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G.R.F. View Drop Down
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Posts: 4028 		Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 10:57am
Originally posted by transient

Yep, OKs use them......Looks like a bit of 10mm


Thanks, that's sort of it, I still can't work out how that can function, as it goes one way it pulls the other, then it's not the only crazy thing about that boat. Geez how can that work, the centreboard, therefore the centre of lateral resistance is ahead of the cockpit, no, I don't want to even start on how wrong that all is, just let me concentrate on the task to hand, a system to keep the boom open and ahead of the mast when I need it.

So, did someone say 10 mil, is that stuff 10 mil on the not exactly OK in that picture?
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transient View Drop Down
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Posts: 715 		Post Options Post Options   Quote transient Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 11:08am
My estimate of shockcord dia was a little of out.

Try this link:
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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 11:12am
Originally posted by G.R.F.

I still can't work out how that can function, as it goes one way it pulls the other,

The block at the bow is the crucial thing to make it work, because it means that the tension is equal each side. Thus with the boom on the centreline it does nothing, because the force on each side and the leverage is identical.
However once the boom is let out a bit, on the lee side the shockcord is pulling direct from the boom to the bow, but on the windward side the shock cord is pulling along the line of the boom because its touching the mast. Thus although the force exerted by the shock cord on each side of the boom is still identical, because of the block, the leverage is much greater on the lee side because on that side the force comes at a good angle to the boom, but on the windward side its coming directly along it.
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Posts: 1312 		Post Options Post Options   Quote Do Different Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 11:21am
It will work, geometry, just draw it out plan view with a pulley on the bow so tension is equal on all three side and you will see the forces n action. (thinking about it I guess it would also work without the pulley)
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Posts: 742 		Post Options Post Options   Quote rb_stretch Quote  Post ReplyReply Direct Link To This Post Posted: 21 Feb 13 at 11:43am
Originally posted by G.R.F

got himself beaten by a Solo in light weather and that can never be allowed to happen again...
 
Unfortunately many of us suffer that fate every light wind race. Certainly in our club, we know if it is a drifter the Solos are going to win. I've even seen a Solo sail straight past an RS300 on the water, both with good helms.
 
 
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