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| Laser 28 - Excellent example of this great design Hamble le rice |
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| Laser 140101 Tynemouth |
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| Rossiter Pintail Mortagne sur Gironde, near Bordeaux |
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List classes of boat for sale |
Trapeze Points |
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BBSCFaithfull 
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Joined: 06 Dec 05 Location: United Kingdom Online Status: Offline Posts: 1251 |
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 Topic: Trapeze PointsPosted: 24 Nov 06 at 1:40pm |
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Hi guys. i was just thinking that if trapezing is the most effecient way to gain leverage etc. Why the trapeze(s) arent attached to the top of the mast where they would be more efficent?
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49erGBR735HSC
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Joined: 30 Mar 05 Location: United Kingdom Online Status: Offline Posts: 1991 |
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Posted: 24 Nov 06 at 1:47pm |
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It's due to loading, if you have trapeze points from the top of most masts, they'd snap, hence the reason they usually are taken off a point near the upper spreaders on twin trap boats and near the shroud hound attachment points on other boats. Edited by 49erGBR735HSC |
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Matt Jackson
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Joined: 21 Sep 04 Location: Darlington Online Status: Offline Posts: 962 |
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Posted: 24 Nov 06 at 1:52pm |
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You will also change the shape of the mast which could amongst other efects reduce gust response by stopping the top of the mast bending off. Does the point the wire come from actually matter? if it did then there would be a difference in mechanical advantage between a trapeze and a sliding seat... and I don't think there is. It's the distance form the centrline that is critical. |
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Laser 203001, Harrier (H+) 36
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Guest
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Joined: 21 May 04 Location: United Kingdom Online Status: Offline Posts: 0 |
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Posted: 24 Nov 06 at 2:13pm |
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Actually the point that the trapeze is attached to the mast makes no difference on the leverage you apply to the rig/hull/folis system ... Don't they teach this stuff at schools anymore ... and they all still get 4 A's at A level ... (hell in a hand cart blah blah ...) However it does make a difference to the tension in the wire and the comfort of the trapeze position and the mast bend ... Rick
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Iain C
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Joined: 16 Mar 04 Location: United Kingdom Online Status: Offline Posts: 1113 |
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Posted: 24 Nov 06 at 2:36pm |
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The point where the trap attaches is irrelevant for leverage. However as rightly pointed out it does affect gust response, hence 505s now having adjustable height trap wires...you can pull the top part of the wire in towards the mast to make the rig more responsive in certain situations.
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RS700 GBR922 "Wirespeed"
Fireball GBR14474 "Eleven Parsecs" Enterprise GBR21970 Bavaria 32 GBR4755L "Adastra" |
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Calum_Reid
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Joined: 09 Apr 04 Location: United Kingdom Online Status: Offline Posts: 59 |
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Posted: 24 Nov 06 at 2:46pm |
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I was told the reason the 505's have that is because with there massive new monster kites they had to make the halyard sheave higher and this meant the sheave is miles above supported mast i.e the hounds so they use the crew on the trapeeze to give some support to the mast when reaching. Then they pull the lines in so they are comming from the lover point upwind so as not to affect the mast bend.
Its another thing that the latest 505's have to add to there checklist before every manouver. I swear the guy at our club takes his clipboard out with him1 |
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Guests
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Posted: 24 Nov 06 at 2:47pm |
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Sorry for my lack of understanding but if the point at which it attached is irrelevent then attaching the trapeze to the very bottom of the mast would contribute the same leverage as attaching it say 2 3rds up the mast??? Doug |
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BBSCFaithfull
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Joined: 06 Dec 05 Location: United Kingdom Online Status: Offline Posts: 1251 |
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Posted: 24 Nov 06 at 3:01pm |
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Well thanks
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Guest
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Joined: 21 May 04 Location: United Kingdom Online Status: Offline Posts: 0 |
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Posted: 24 Nov 06 at 3:15pm |
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Correct - but the tension in the trapeze wire would be so high you probably would not be able to stay on the wire long and you'd have to have the hook upside down ... Rick |
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Strawberry
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Joined: 21 Jun 05 Location: United Kingdom Online Status: Offline Posts: 1337 |
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Posted: 24 Nov 06 at 3:39pm |
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That is a classic! Thanks for cheering me up! |
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Cherub 2649 "Dangerous Strawberry
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