Adjusting shroud tension |
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zippyRN ![]() Far too distracted from work ![]() Joined: 14 Sep 06 Online Status: Offline Posts: 437 |
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difficulty in setting the shrouds can be a sign that the forestay is adjusted too tight / mast is too upright . is there a mast rake figure given for the boat ?
assuming the shrounds and spreaders are of equal length and the mast is sitting upright in the boat shroud pins the same hole on the chain plates there's generally two ways to measure mast rake with the jib hoisted and tensioned ( to a ball park figure for the class on a loos type gauge) 1. hoist a long tape measure on the main hallyard and measure the distance from the mast head to a known fixed point at the stern (traditionally centre of the transom) 2. with the boat sitting level attach a modest mass to the end of the main halyard and let it settle in the vertical plane then mesure from the gooseneck to the halyard paralle to the ground |
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iGRF ![]() Really should get out more ![]() ![]() Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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Ha welcome to 1955.
Adjusting those stupid thingummies in a Vision? If there is grass growing nearby you could watch, or paint drying far better use for your time. Wait til you drop the little circlip into the gravel of the boat park, that's just extra special fun, just one of the delights of this archaic sport, you'd think by now they'd have invented something simple that works... they haven't. You could try something called fast pins, you'll think oh that looks a bit better, then you'll find they won't fit, because those thingummies that all look the same? They're not, there are micrometer size differences, depending on wether Ron & Stan made them or Har & Ken. Thingummies are the very pits of hell, best advice? If they're together, leave them that way and don't mess with them, one bad tack would negate any gain you might have made by fiddling with them, not to mention the vexation to the spirit and charisma draining action of trying to line up the loop with the pin and hole, if you do try and manage without torching the entire boat, you'll be a better man than I.. |
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winging it ![]() Really should get out more ![]() ![]() Joined: 22 Mar 07 Online Status: Offline Posts: 3958 |
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Is there not a friendly instructor at your club that can help? Visions don't have a very sophisticated tuning guide - we have one as a club boat here - but the manual should have some data in it. I will have a look at our boat and see which holes we use.
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the same, but different...
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MerlinMags ![]() Admin Group ![]() ![]() Joined: 19 Mar 04 Location: UK, Guildford Online Status: Offline Posts: 588 |
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Jim is right. You choose which hole to use in the shroud 'metal thingummies' when the boat is on land with the sails down and everything loose.
Then you hoist the jib, and tighten the jib halyard more and more until you can grab the shroud and feel it tight. Sometimes you can twang it like a harp string to hear a (low) note. |
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JimC ![]() Really should get out more ![]() ![]() Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6660 |
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The key point that I think is being missed is that the actual tension comes from tightening the jib halyard. Without the jib up and tensioned the shrouds should feel very slightly slack so that there isn't a permanent load on the hull when the boat isn't being used. The forestay is there just to hold the mast up when the jib is not in use: it's not normally active while sailing the Vision.
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Ian29937 ![]() Far too distracted from work ![]() Joined: 25 May 05 Online Status: Offline Posts: 409 |
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Did you speak to RS, their after sales is pretty awesome?
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jake2010 ![]() Newbie ![]() Joined: 10 May 14 Location: dorset Online Status: Offline Posts: 1 |
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Hi Gary
I to have the same problem as dixie with regards to tentioning the shrouds , is there any sites that you know of that show a video of how to do this |
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Garry ![]() Really should get out more ![]() ![]() Joined: 18 Apr 04 Location: United Kingdom Online Status: Offline Posts: 536 |
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The rig tension, rake and prebend (spreaders) all
interact. 1 set the spreaders for the wind strength and your weight. 2 put the shrouds in the hole that looks about right. With the jib hoisted apply the rig tension (you adjust it with the pull down arrangement that attaches to the jib halyard). 3. Now check the mast is straight (side to side) by sighting up it and measure the rake. 4. Take the rig tension off and move the shrouds then repeat until at the required rig tension you have the right rake. 5 Now check your prebend (spreader deflection). Keep repeating until all your measurements are right. This is your base position. Then if its going to be very, very light or strong winds go down one - two holes class guide should give an indication. If you're having trouble getting to a lower hole try getting your crew to pull down on the cleated main halyard to bend the tip of the mast towards you while you fit the pin. Raking the mast opens the slot (generally it also makes the boat slightly faster upwind and slower downwind). When you start to get overpowered you need to depower the rig you do this by increasing the gnav, outhaul and downhaul. If still oevrpowered you then start raking the mast and shortening the spreaders. In the gusts ease the main and if necessary the jib. Remember a flat boat is faster than a heeled boat and the vision is a pig to steer if you don't sail it flat. PM your address if you want me to send you a CD with a video / description of how to do it. Garry Edited by Garry |
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Garry
Lark 2252, Contender 298 www.cuckoos.eclipse.co.uk |
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ham4sand ![]() Far too distracted from work ![]() ![]() Joined: 27 Jul 09 Location: United Kingdom Online Status: Offline Posts: 452 |
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loosen the forestay on the shore, move the shrouds to the
right hole on the "thingumies" then retension the forestay |
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John Hamilton
cherub 2645 - cheese before bedtime cherub 3209 - anatidaephobia laser 176847 - kiss this |
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dixie03 ![]() Newbie ![]() ![]() Joined: 08 May 10 Location: United Kingdom Online Status: Offline Posts: 2 |
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The boat is a RS Vision, just bought. When rigging the mast there is plenty of information in the manual on how to set the spreaders, but nothing on how to attach the shrouds. Looking on the RS owners forum, there is some guidance on the tension in the shrouds for different wind strengths, but how do you do this? By hand, ashore you can just about get the shrouds in to the top holes in the shroud thingumies connected to the deck.
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