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| Sportsboat - Beneteau First Class 7.5 Troon |
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Another breezy one - another spanking. |
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rb_stretch 
Really should get out more 
Joined: 23 Aug 10 Online Status: Offline Posts: 708 |
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 Posted: 06 Feb 14 at 7:49pm |
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Just looked at some photos to remind myself of the EPS setup and see that it only has lowers that attach at the boom. Basically the gooseneck is fixed, which makes me think that the kicker might not be quite so effective on an EPS.
I imagine a lot of the effort is trying to overcome friction and the relatively poor geometry in the gnav. |
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laser193713
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Joined: 13 May 09 Location: United Kingdom Online Status: Offline Posts: 873 |
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Posted: 06 Feb 14 at 8:24pm |
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Loosen the lowers then...?
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pondlife1736
Groupie 
Joined: 17 Jan 14 Online Status: Offline Posts: 83 |
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Posted: 06 Feb 14 at 8:41pm |
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There aren't any other shrouds, it's basically an unstayed rig. Not sure what the purchase is (8:1?) but the EPS GNAV bars seem to be a weak point. The whole setup looks much less robust than say the 300.
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laser193713
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Joined: 13 May 09 Location: United Kingdom Online Status: Offline Posts: 873 |
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Posted: 06 Feb 14 at 9:28pm |
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I suspect that for that rig you want the leeward lower to be just slack most of the time. That should mean the mats is not restricted in any way and truly acting unstayed.
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 5636 |
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Posted: 06 Feb 14 at 10:30pm |
The lowers really aren't lowers at all in a functional sense. What goes on with that rig is that its designed as a conventional unstayed rig in a deep hull, much like a Finn or an OK, except that instead of the deep hull with the top bearing being the deck, its a shallow hull, and the "deck" bearing is a ball bearing supported in place by what look like lowers but really ought to be thought of as wire deck beams!! |
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yellowwelly
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Joined: 24 May 13 Online Status: Offline Posts: 2003 |
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Posted: 07 Feb 14 at 8:54am |
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so, they're essentially a wire 'space frame' to use 90's terminology we don't hear much these days?
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laser193713
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Joined: 13 May 09 Location: United Kingdom Online Status: Offline Posts: 873 |
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Posted: 07 Feb 14 at 9:10am |
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My point still stands... the longer the bury measurement of the mast the stiffer it will be. I would imagine that having these shrouds (spaceframe whatever you want to call it) slightly less than bar tight would make the mast feel like it was being supported over less of its length. This would allow more mast bend. If this is not the case then I still suggest more kicker. If you break the gnav then you've probably pulled it just about hard enough. Plenty of lube on all the gnav parts too should make things a little easier!
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Noah
Far too distracted from work 
Joined: 29 Dec 04 Location: United Kingdom Online Status: Offline Posts: 478 |
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Posted: 07 Feb 14 at 11:13am |
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If its not being raced in class, then maybe replace the gnav with a conventional kicker? As much purchase as you want / need then...
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laser193713
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Joined: 13 May 09 Location: United Kingdom Online Status: Offline Posts: 873 |
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Posted: 07 Feb 14 at 11:20am |
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Don't replace it with a normal kicker or you really will never bend that mast. If you are worried about the GNAV arm then buy a stronger one from selden and fit that. http://www.seldenmast.com/products/dinghies_only/booms/gnav_system.html
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iGRF
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Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 5062 |
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Posted: 07 Feb 14 at 11:44am |
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A small sail is the answer, the one that was designed for people my weight, but to date I can't find other than by buying another complete boat with two rigs, a small sail and mast top combo which will presumably have their luff curves matched.
As to the lowers, they do act like a deck or space frame, but with the advantage of being adjusted for rake, I really need to make them single wire adjustable, at the moment the only control is via an adjustable forestay I think I might have fashioned after the original broke and dismasted me mid race, forcing the most embarrassing moment of my entire waterborne career, being 'rescued' on a puddle by two girls in a coracle, me, who has sailed the high seas around the world without major incident rescue wise. This lake humbles even the biggest ego... Edited by iGRF - 07 Feb 14 at 11:45am |
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