Laser 140101 Tynemouth |
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Laser 161752 Tynemouth |
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Laser 28 - Excellent example of this great design Hamble le rice |
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List classes of boat for sale |
Rig Tension |
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jeffers ![]() Really should get out more ![]() ![]() Joined: 29 Mar 04 Location: United Kingdom Online Status: Offline Posts: 3048 |
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I am sure other can explain far better than I but it means you can have different tensions on the rig. Upwind, sheeted in the rig is tighter and you ben the mast using the mainsheet. Offwind the mast is straighter giving you a fuller sail. Downwind having sloppy shrouds allows the rig to be a little more upright. When I had my Blaze you didn't really use the kicker aside from to stop the boom lifting on a reach. This may have changed now with a more refined sail and a carbon mast.....
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Paul
---------------------- D-Zero GBR 74 |
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jeffers ![]() Really should get out more ![]() ![]() Joined: 29 Mar 04 Location: United Kingdom Online Status: Offline Posts: 3048 |
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Oh and as an aside I sailed a brand new Supernova on Sunday. His rig was 'Blaze floppy' but seemed to work fine aside from a complete lack of feel from the mainsheet.
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Paul
---------------------- D-Zero GBR 74 |
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Woodbotherer ![]() Posting king ![]() ![]() Joined: 11 Dec 14 Online Status: Offline Posts: 192 |
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So I guessed as much, but I wonder if a new carbon rigged Blaze would show the same improvement, making the rig floppy help the tin rig, but a more 'flexi' carbon, would that benefit from loose rigging or would that need tightening up a bit, my view would be the latter.
Although the floppy rig without kicker would help that running by the lee effect offwind.
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Rupert ![]() Really should get out more ![]() Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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Floppy rigged boats are a compromisein order to get things working upwind as well as down. Firefly - floppy rigged, no shroud adjustment allowed on the water. The sails are cut to suit this style of sailing. Albacore - loads of rig tension, but you can let it off to bring the mast upright going offwind. I imagine that Applecore sailmakers have a different brief to Hydes with the Firefly.
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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patj ![]() Really should get out more ![]() Joined: 16 Jul 04 Location: Wiltshire Online Status: Offline Posts: 643 |
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Playing the rig tension on a modern Albacore is a major learning curve! Shrouds can be eased singly or evenly as a pair, mast ram can be adjusted up and down and jib tension adjusted, all whilst still handling main, kicker, outhaul, cunningham, jib sheets and flyaway jib pole and still keeping head out of boat enough to sail a serious race!
For a modern Merlin, add in to all that the complications of a symmetric spinnaker and twin fly-away poles and you can see how these classes remain challenging to their sailors. |
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Time Lord ![]() Far too distracted from work ![]() Joined: 03 Dec 13 Location: Warwickshire Online Status: Offline Posts: 301 |
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On many modern Merlins you have the shrouds, jib tension, kickers and lowers linked so that only one string needs to be adjusted when you want to rake the rig.
Flying the spinnaker does not increase the workload except as it is launched when the puller and pole downhaul are pulled on before/after - no adjustment needed. I suppose you may want to adjust the pole height but most would set this before a race and leave it. Rig tension is normally set so that the leeward shroud does not pant on a beat - no idea what loading as have never bothered to measure it. |
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Merlin Rocket 3609
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craiggo ![]() Really should get out more ![]() ![]() Joined: 01 Apr 04 Location: United Kingdom Online Status: Offline Posts: 1810 |
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Most classes I'm aware of that have tensioned rigs are running more than 270lbs of rig tension on 3mm 1x19 stainless wire. On the Grad I run around 360lbs and know of others using 400.
You have to remember that safe working loads are given for safety critical applications and last time I looked the roof on my boat want safety critical. For dinghies a safety factor of 2 is ample so I'd be comfortable going up to 50% of breaking strength. After all most failures are at the swage and not in the middle of the wire. |
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NHRC ![]() Posting king ![]() Joined: 13 Dec 13 Location: Lymington Online Status: Offline Posts: 102 |
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Pre-stretch after splicing. 78 did have a large amount of creep, 90 was a great deal better. For example I did some testing with Lasers race kits. On the first part of the vang I spliced two strops same length (1200mm, I think) one in 2.5mm SK78 the other in 2.5mm SK90. I think both ropes were made by FSE. After 20-25 minutes sail testing in 20 knots wind the SK78 strop had stretched 70mm the SK90 just 7mm. When I made the same component in SK90 and hung a 20kg weight on it over night after sail testing there was no stretch/creep. I am making up a new set of rigging for my Merlin including getting Stu West (west engineering- http://www.westengineeringltd.co.uk ) to make me some T5 end fittings that slot into standard spreaders. I am going to go with a two part shroud, like on a yacht. One part deck to spreader, next part spreader to Hounds at the mast. |
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gordon1277 ![]() Really should get out more ![]() Joined: 24 Mar 10 Location: United Kingdom Online Status: Offline Posts: 665 |
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Hi NHRC
I just took the dyneema shrouds of my Phantom based on the comment from a rigger that although most of the reference to UV issues was incorrect he was more worried about abrasion from grit, as my boat is in the compound at Lee with SW salt water and sand in the breeze I thought it best to swap to wire. What are your thoughts on this? Also dyneema shrouds hum under load in a breeze and it can be distracting but you can tell the tension by the note. |
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Gordon
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NHRC ![]() Posting king ![]() Joined: 13 Dec 13 Location: Lymington Online Status: Offline Posts: 102 |
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You can use a dyneema cover on even very thin diameters which will stop the resonance and protect against UV. I have not seen dyneema degrade through the particles in the air like salt and sand. Vectran does definitely suffer from this but dyneema is pretty durable. I don't think your informant is correct from experience. It is a lot easier to examin dyneema than it is wire, you must constantly check your rigging up above and on the boat for breakages and other issues. I trust dyneema more than wire.
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