Laser 140101 Tynemouth |
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Laser 28 - Excellent example of this great design Hamble le rice |
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Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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List classes of boat for sale |
Weight equalisation |
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423zero ![]() Really should get out more ![]() Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420 |
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The wire is purely to support your weight, positioned correctly it offers support for your back.
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Robert
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tink ![]() Really should get out more ![]() Joined: 23 Jan 16 Location: North Hants Online Status: Offline Posts: 789 |
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As I said yesterday windsurfers are different because the mast mast is able to tilt relative to the position of the centre of buoyancy. I would draw another picture but it won’t have any impact on your thinking and I’m going sailing instead.
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Tink
https://tinkboats.com http://proasail.blogspot.com |
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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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tink ![]() Really should get out more ![]() Joined: 23 Jan 16 Location: North Hants Online Status: Offline Posts: 789 |
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I believe professionally you where something in marketing I am an Engineer. The wire and where it is attached to the mast or the person has no effect of the righting moment. The only factors are total sail force, effective height of sail force, how far outboard the crew weight is and the crew weight Think about a TOY unstayed mast and sliding seat no wires, wind increases more force in sail sailor moves outboard more on the seat it’s that simple. The trapeze wire and the shrouds are irrelevant
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Tink
https://tinkboats.com http://proasail.blogspot.com |
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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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423zero ![]() Really should get out more ![]() Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420 |
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Think about the angle the wire is from your body to the mast, it's not much off vertical, if you stood at the side of your boat and tried to tip boat on its side using the exact same angle, you wouldn't tip it over.
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Robert
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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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Lot of cack handed thinking here. It’s the mast and sail attached to it that’s trying to tip the boat over. So just as fatter head sails have more adverse heeling moment so does having a wire attached to the mast high up to counter the heel What then happens the combine weight downforce is spread to weather . The bigger the wire angle the further to weather. Taller helms therefor being faster and able to sail the boat flat,
I agree with the issues having a too high hook would cause in lulls a consequence of my thinking marred by years of having a boom to hang on if necessary, but I think I might have a work around. The point still wrankles though as to why so many think it’s wrong |
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Oatsandbeans ![]() Far too distracted from work ![]() Joined: 19 Sep 05 Location: United Kingdom Online Status: Offline Posts: 382 |
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The shrouds don’t really come into this. The loads are balanced when the rig tension is applied and yes the windward one’s tension will change whilst sailing it doesn’t contribute to the heeling effects. The simplest way to get your head around this ( probably been said earlier) is to see the problem as two balanced moments (turning forces) one from the rig and the centreboard and the other from the crew weight and the hull buoyancy.
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tink ![]() Really should get out more ![]() Joined: 23 Jan 16 Location: North Hants Online Status: Offline Posts: 789 |
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How sail boats work (simplified)
Imagine all the sail forces act from a point F1 a distant D1 above the centre of buoyancy of the hull (red dot) The sailors weight acts about F2 a distance D2 horizontal from the centre of buoyancy To stop swimming F1 x D1 must equal F2 x D2 The wire is completely irrelevant ![]() Edited by tink - 03 Jan 22 at 8:26am |
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Tink
https://tinkboats.com http://proasail.blogspot.com |
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Oatsandbeans ![]() Far too distracted from work ![]() Joined: 19 Sep 05 Location: United Kingdom Online Status: Offline Posts: 382 |
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If you sit on the side then put your weight on the wire, yes the tension in the shroud will reduce as the mast is now supported by two wires. Not quite sure how this helps.
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