| Re: 4 way jib system conversion to tramp loops
[Re: malc]
#11484 10/08/02 11:06 PM 10/08/02 11:06 PM |
Joined: Aug 2002 Posts: 40 NZ simonm
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Posts: 40 NZ | Poeple have done various things in terms of the angle but if you look at the guys who pioneered this approach, Booth, Bundock etc, they run across a 90% angle. We went this way too at the same time and it worked fine - to be honest we hardly ever adjusted which loop we were using. You can argue about what is theoretically better but the Aussie idea was to make things as simple as poss - they used the sheet tension to achieve any twist required.
sm
Simon Manning
A Class NZL230.........boats are for life...
| | | Re: 4 way jib system conversion to tramp loops
[Re: malc]
#11486 10/09/02 01:22 AM 10/09/02 01:22 AM |
Joined: Aug 2002 Posts: 40 NZ simonm
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Posts: 40 NZ | I will scratch out our old measurements (there was a thread on this a month or so ago too). But we went to the aft raked rig at the same time. Plus because the tramp lifts up under the load, you need to mount the loops well forward of where you would normally have the slides.
We put a lot of reinforcing underneath the tramp (some dacron and tramp mesh layers) too - I would not recommend going to eyelets without adding some serious reinforcing, even if you are going to tie back to the sliders.
On our Marstrom, we used one piece of 6mm spectra for each side, threaded through all 6 eyelets with big knots at the ends. Worked fine. If the sliders can run far enough forward, that would be a good option.
Simon Manning
A Class NZL230.........boats are for life...
| | | Re: 4 way jib system conversion to tramp loops
[Re: simonm]
#11487 10/09/02 01:45 AM 10/09/02 01:45 AM |
Joined: Aug 2002 Posts: 40 NZ simonm
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Posts: 40 NZ | Okay, found my notes:
Measurements (taken from Bundock/Forbes boat in Sydney prior to Sydney 2000 Worlds). Remember these are for the recent aft-raked rig setting.
- Eyelets are 38" from aft edge of mainbeam
- Three pairs of eyelets, outer ones are 23" from hull inwale, then 34", then 42". Measurements are to centre of each pair, which are spaced between 1.5" and 2" apart.
Hope this helps
sm
Simon Manning
A Class NZL230.........boats are for life...
| | | Re: 4 way jib system conversion to tramp loops
[Re: malc]
#11490 10/09/02 01:55 PM 10/09/02 01:55 PM |
Joined: Aug 2002 Posts: 40 NZ simonm
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Posts: 40 NZ | Yeah, I think you might be right - my handwriting was a bit hard to read. Guess I'd better check my measurements. If you can wait a few hours, I'll drop past the boat club and check.
sm
Simon Manning
A Class NZL230.........boats are for life...
| | | Re: 4 way jib system conversion to tramp loops
[Re: simonm]
#11491 10/09/02 02:51 PM 10/09/02 02:51 PM |
Joined: Aug 2002 Posts: 40 NZ simonm
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Posts: 40 NZ | Okay, you were right - I mixed my measurement units!
I measure 23cm, 33cm and 42cm from inwale. And 38inches (approx 96cm) from aft edge of main beam. The eyelets are 40mm apart.
The inwale is the inner gunwale, ie the corner of the hull.
cheers
sm
Simon Manning
A Class NZL230.........boats are for life...
| | | Re: 4 way jib system conversion to tramp loops
[Re: malc]
#11494 10/09/02 10:15 PM 10/09/02 10:15 PM |
Joined: Jun 2001 Posts: 1,911 South Florida & the Keys arbo06
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Posts: 1,911 South Florida & the Keys | Not comparable but....I just did the same with my H-20. I replaced the wire with spectra and Knotted stainless rings @ 4" apart. If anyone wants a photo, give me yer e-mail and I'll get you one ASAIC (as soon as I can)
Eric
Eric Arbogast ARC 2101 Miami Yacht Club | | | Re: 4 way jib system conversion to tramp loops
[Re: malc]
#11496 10/11/02 07:53 PM 10/11/02 07:53 PM |
Joined: Jul 2001 Posts: 344 Arkansas, USA Kirt
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Posts: 344 Arkansas, USA | Guck Inc. in Rhode Island offers a complete conversion kit-
Kirt
Kirt Simmons
Taipan #159, "A" cat US 48
| | | Re: 4 way jib system conversion to tramp loops
[Re: malc]
#11497 10/12/02 01:00 AM 10/12/02 01:00 AM |
Joined: Aug 2002 Posts: 40 NZ simonm
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Posts: 40 NZ | Our was a DIY effort. Refer the photos on the earlier thread - link above.
We ordered a harken track curved 'ends up' @ 1.75m radius and 1m or 1.2m long (ours is 1m). We are using the smallest Harken track which was a big call at the time but it works fine. I suspect most people will use a bigger track.
We have anchored it with small spacers of 3/4" plastic rod and long model c'sunk pop rivets.
I made a mock-up of the SS ends and gave it to a clever engineer. Next time I would do carbon.
There are various methods of doing these things - some pivot (refer the Tornado website). I prefer to have it fixed so you don't lose any energy with movement when easing or tightening the jibsheet.
I don't know anything about Lars Guck's system but you should check that out to as it will no doubt have a lot of thought in it.
regards
sm
Simon Manning
A Class NZL230.........boats are for life...
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