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Solo changes survey |
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zeon
Far too distracted from work Joined: 20 Aug 16 Online Status: Offline Posts: 316 |
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Topic: Solo changes survey Posted: 07 Sep 19 at 9:09pm |
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You missed my point a little Every boat has to gently updated . Not to make it look brand new but to stop it looking old and out of date. I sail in a class that was designed in 1932, but that doesn’t mean it still has to solid wood decks and a wood mast and boom. It’s had two weight reductions, can be made out of frp and can have carbon masts and boom.
Edited by zeon - 07 Sep 19 at 9:36pm |
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Paramedic
Really should get out more Joined: 27 Jan 06 Location: United Kingdom Online Status: Offline Posts: 929 |
Post Options Quote Reply Posted: 08 Sep 19 at 6:24am | |
Whats needed to put that to bed is a commitment that there will be no further rig changes for a minimum of - say - 5 years. The tracks are glued on and a clew strap would still be needed. It makes attaching the kicker and mainsheet blocks more complex but its do able. Other classes do it.
Edited by Paramedic - 08 Sep 19 at 6:25am |
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JimC
Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6649 |
Post Options Quote Reply Posted: 08 Sep 19 at 6:41am | |
Trouble is that's a commitment that cannot be made in a democratically controlled class. The membership is always free to introduce a rule change. |
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ian.r.mcdonald
Far too distracted from work Joined: 24 Feb 06 Location: United Kingdom Online Status: Offline Posts: 440 |
Post Options Quote Reply Posted: 08 Sep 19 at 7:45am | |
I thought most classes made the change to loose foot at the same time. Based on another classes experience, does just a boom swap work as well as the existing unit? Is the benefit of carbon significant? |
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davidyacht
Really should get out more Joined: 29 Mar 05 Online Status: Offline Posts: 1345 |
Post Options Quote Reply Posted: 08 Sep 19 at 8:46am | |
The lens foot that is used with a boom with a track helps seal the sail to the boom, which forms an end plate which reduces drag losses from the foot of the sail, and increases the effective aspect ratio of the sail and its efficiency ... well that’s the theory.
However with the loose foot pulled tight, the boom still forms and end plate, and there is an opportunist to get some unmeasured sail area under the boom when sailing downwind. I think that the innovation in the Northern Hemisphere was off the back of a book by Murray Ross which brought a lot of the stuff the Aussies were doing in Northbridge 14’s, and then the Merlins and N12s converted to loose foot. I went to Michael Mac got my bolt rope foots changed for loose foots and bolted a short track to the old boom and it worked fine. Fitting out a carbon boom will normally require sailcloth or webbing straps for the kicker and mainsheet take off and a track and associated blocks for the outhaul, I would suggest that these will cost a lot more than the standard Selden set up. I guess that a carbon boom will be kinder on the head, having less hard corners, and being lighter it carries less momentum, but it will be more expensive.
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Happily living in the past
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JimC
Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6649 |
Post Options Quote Reply Posted: 08 Sep 19 at 9:44am | |
Class rules ought to be smarter than that really these days. ERS has the option to measure such area, whether loose footed or shelf foot.
Some of us were a good 10 years or more ahead of that ... #CherubClass |
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maxibuddah
Really should get out more Joined: 06 Mar 09 Location: United Kingdom Online Status: Offline Posts: 1760 |
Post Options Quote Reply Posted: 08 Sep 19 at 10:42am | |
Davidyacht,
you don't need a track for the outhaul, a looped strap or rope on the clew will suffice. You are also right that a webbed strap will do for the main and kicker take-off. Its position is controlled by a rope to the end of the boom. Pretty simple and cheap, plus no holes in the boom to create stress points. As the for lens foot creating an end plate, etc, does it really make that much difference on a slower boat like a Solo? Also its not controlled either, as it changes shape as you play with the outhaul. In a lot of cases its such a flimsy material I cannot see that it provides any end plate effect. Its about getting the lightest bit of material in place to meet the rules, while in effect attempting to not actually being there. It just seems like a fairly useless piece of material getting in the way adding a little more expense to a sail. In fact I expect that in most cases you could just cut it off if you swap to a carbon boom, negating the need to buy a new sail. Would it make that much difference? As for updating the boat, etc, the Solo seems fairly sucessful without the need to constantly update. Not keeping up with the Joneses seems to be a good thing for it.
Edited by maxibuddah - 08 Sep 19 at 10:44am |
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Everything I say is my opinion, honest
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davidyacht
Really should get out more Joined: 29 Mar 05 Online Status: Offline Posts: 1345 |
Post Options Quote Reply Posted: 08 Sep 19 at 11:58am | |
Problem with the webbed strap for the outhaul is the friction c/w a track. Roger Angel used to insert a stainless steel rod with a block running on it, which worked quite well. To be fair the inhaul system on Solos pretty much negates the need to adjust the outhaul. I would suggest the two reasons not to go to carbon booms would be that these would not be off the shelf like the Selden section and would cost more.
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Happily living in the past
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davidyacht
Really should get out more Joined: 29 Mar 05 Online Status: Offline Posts: 1345 |
Post Options Quote Reply Posted: 08 Sep 19 at 12:10pm | |
Yep I think the book was a summary of Antipodean thinking at that time and rolled out many Cherub and Bethwaite ideas which were subsequently adopted in the Northern Hemisphere ... loose foots, close sheeting, mast struts and daggerboards were all in there. I guess most of this was featured on Flat Stanley, Jim may well advise if these were on earlier Cherubs. |
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Happily living in the past
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JimC
Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6649 |
Post Options Quote Reply Posted: 08 Sep 19 at 12:17pm | |
We learned about this stuff in the early 70s.
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