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NHRC View Drop Down
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Posts: 102 		Post Options Post Options   Quote NHRC Quote  Post ReplyReply Direct Link To This Post Topic: Rig Tension
    Posted: 10 Feb 15 at 12:16am
Higher modulus 

You won't see creep without a micrometer if you can splice correctly.

The ultra modulus SK 99 is even more impressive. You can drop down to 2mm braided and be stronger than Dyform wire and with no creep, IF YOU SPLICE CORRECTLY.
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Daniel Holman View Drop Down
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Posts: 997 		Post Options Post Options   Quote Daniel Holman Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 15 at 12:40am
What about the constructional creep? I.e. bedding in of the braiding? Even the pre stretched 78 max bedded in loads the first time it was used and even with massive bury - don't think they were bad splices.
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Woodbotherer View Drop Down
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Posts: 192 		Post Options Post Options   Quote Woodbotherer Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 15 at 9:18am
So, as an aside and I came into this game being instructed to put massive rig tension on at all times (Musto Skiff) I now hold the opposite view and have my own theories, but can someone explain to me how it was the Blaze rig is so much faster being sloppy shrouded?
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Chris 249 View Drop Down
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Posts: 2041 		Post Options Post Options   Quote Chris 249 Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 15 at 9:40am
Originally posted by NHRC

The 3.5 mm Dyneema SK99 we have been tested averages at just under 1700kgs.

Where's the emoticon for slack-jawed amazement? I've been out of the loop for such things and that seems to be amazing.
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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 15 at 9:59am
Originally posted by Woodbotherer

So, as an aside

A trapeze boat with conventional spreaders needs massive rig tension because the trapeze unloads the windward shrouds and reduces effectiveness of the spreaders. Indeed in extreme cases the windward shroud unloads completely and instead of the windward spreader pushing the mid mast to leeward the lee spreader is pushing the mid mast to windward. So crew gets on wire and the mast dumps all the power. A non trapeze boat doesn't have that problem, nor does a trapeze boat with diamonds rather than spreaders.
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iiitick View Drop Down
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Posts: 478 		Post Options Post Options   Quote iiitick Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 15 at 10:03am
Going back to the beginning of this thread, why would a mirror which is presumably gunter rigged need any rig tension other than to keep the mast up?
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JimC View Drop Down
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Jib luff?
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Jon711 View Drop Down
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Posts: 465 		Post Options Post Options   Quote Jon711 Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 15 at 10:35am
Originally posted by iiitick

Going back to the beginning of this thread, why would a mirror which is presumably gunter rigged need any rig tension other than to keep the mast up?


The OP quoted the figures for a bermudan mast... So that figure sound about right to me, but as Rupert says will not be as important as the correct rake..

Jon
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MerlinMags View Drop Down
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Posts: 588 		Post Options Post Options   Quote MerlinMags Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 15 at 11:42am
Another aside - when I add rig tension to my ancient Merlin, all that happens is the hull's beam reduces slightly!
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jeffers View Drop Down
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Posts: 3048 		Post Options Post Options   Quote jeffers Quote  Post ReplyReply Direct Link To This Post Posted: 10 Feb 15 at 12:01pm
Originally posted by MerlinMags

Another aside - when I add rig tension to my ancient Merlin, all that happens is the hull's beam reduces slightly!

And the centreboard gets harder to move?
Paul
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