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 |
![]() ![]() ![]() ![]() Posted: 03 Jan 22 at 10:28am |
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Griff, if you didn't have a trapeze you couldn't have your feet on side of boat and lie out horizontally, you would have to put your feet under hiking straps, but because you are nearer centre line of boat you have less righting.
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Robert
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mongrel ![]() Far too distracted from work ![]() Joined: 27 Aug 08 Online Status: Offline Posts: 304 |
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& why in a lull you bend your knees to reduce your righting moment.
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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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And why you'd have to bend your knees further and earlier with a higher hook? Edited by iGRF - 03 Jan 22 at 12:58pm |
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Sam.Spoons ![]() Really should get out more ![]() Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3400 |
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I'm guessing this is something to do with the 'apparent wind' effect we know and love. Edited by Sam.Spoons - 03 Jan 22 at 1:31pm |
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Sam.Spoons ![]() Really should get out more ![]() Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3400 |
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Tall people have more righting moment not because the trap hook is further from the boat but because their CoG is further from the boat. Moving the hook doesn't change that.
How high up the mast the wire attaches (almost always at the hounds IME) is also irrelevant WRT righting moment but the lower it is the more load on your legs to stay standing horizontally off the side of the boat
You have to have the trap hook at or slightly (but only slightly)* above your CoG to be able to move around the boat, if it's too far above and you feet slip off the gunnel your legs will fall in the water, if to low your head/body will fall into the water. * In practice slightly above your CoG has proven to be most efficient. Edited by Sam.Spoons - 03 Jan 22 at 1:31pm |
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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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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You could fit wings on a contender and the crew could create the same righting moment as a trapezing crew, the key thing is where the crew c of g is. As a engineer this stuff is my bread and butter so my understanding of this stuff is rather relevant. |
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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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Well I would beg to differ, then what do I know, I've only spent thirty odd years marketing harnesses and harness hooks in wind and more recently kitesurfing where the idiosyncrasies are very different. So you'll excuse me for choosing to find out for myself, when I can find a suitable harness with the option to vary hook height. As for fitting racks on a contender, or using your Toy example, they may very well apply sufficient righting force but they will be slower. If you are truly an expert engineer, then I shouldn't have to explain why, but if you wish, I'll try and find a better drawing programme to illustrate why. Edited by iGRF - 03 Jan 22 at 2:29pm |
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Sam.Spoons ![]() Really should get out more ![]() Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3400 |
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The B14 is a good example, huge racks and a 3.05m beam give the same righting moment as a trapeze would, note where the crew's feet are. ![]() Edited by Sam.Spoons - 03 Jan 22 at 2:32pm |
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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Do Different ![]() Really should get out more ![]() Joined: 26 Jan 12 Location: North Online Status: Offline Posts: 1312 |
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Give it up people, there's nothing to be gained here. iGRF has an undoubted history of being a demon windsurfer and marketeer but time and time again he has demonstrated that he entirely missed out on secondary school physics lessons. I have respect for skills and wish him well with his Contender experience.
Edited by Do Different - 03 Jan 22 at 2:44pm |
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Sam.Spoons ![]() Really should get out more ![]() Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3400 |
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Interested to hear your explanation?
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Spice 346 "Flat Broke"
Blaze 671 "supersonic soap dish" |
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