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Adjusting shroud tension

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zippyRN View Drop Down
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Post Options Post Options   Quote zippyRN Quote  Post ReplyReply Direct Link To This Post Topic: Adjusting shroud tension
    Posted: 15 Oct 14 at 12:46am
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 View Drop Down
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Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 14 at 9:15pm
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 View Drop Down
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Post Options Post Options   Quote winging it Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 14 at 8:53pm
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.
the same, but different...

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MerlinMags View Drop Down
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Post Options Post Options   Quote MerlinMags Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 14 at 10:43am
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 View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 14 at 7:27am
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 View Drop Down
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Post Options Post Options   Quote Ian29937 Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 14 at 12:24am
Did you speak to RS, their after sales is pretty awesome?
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jake2010 View Drop Down
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Post Options Post Options   Quote jake2010 Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 14 at 9:45pm
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 View Drop Down
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Post Options Post Options   Quote Garry Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 10 at 10:18am
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
Garry

Lark 2252, Contender 298

www.cuckoos.eclipse.co.uk
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Post Options Post Options   Quote ham4sand Quote  Post ReplyReply Direct Link To This Post Posted: 09 May 10 at 12:02am
loosen the forestay on the shore, move the shrouds to the
right hole on the "thingumies" then retension the forestay
John Hamilton
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Post Options Post Options   Quote dixie03 Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 10 at 10:52pm
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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