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Block Arrangements for shrouds

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G.R.F. View Drop Down
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    Posted: 16 Jan 12 at 10:38pm
Hindsite is always 20 20, I had designed a tunnel in the sketches, but manufacturing expedience ,weight and cost, combined to the fact we were never certain it would work, still not 100% as to what's going to happen in waves. It's a flat water flyer true enough but how she'll cope with the English Channel proper at a pace is yet to be determined.
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Post Options Post Options   Quote JohnW Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 12 at 10:50pm
As You have had ideas from the Merlins, I thought I would throw in the arrangement that I have on my Albacore, (you know you love them!  Tongue)

I have a single string that adjusts the jib halyard and both shrouds together to control rake, as well as the option to adjust each individually:





Blocks with black centres are fixed, others are running.  The first stage of each cascade (at least) need to to be high tension blocks for example the ones on this page:

To do the single string rake control, you need to know the velocity ratio of your shrouds to your jib/forestay so the strings move the correct amount and retain the tension - On my boat it is 1:2 (as near as) which makes it easy.

Dont bother with muscle boxes (even if you can find them), too much friction for a given velocity ratio that a cascade.

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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 16 Jan 12 at 11:19pm
OMG Confused

Merlins, Albacores, you're just out to wind me right up now, think I'll go to bed.


In the meanwhile here's another one, come up with a way i can sheet the main and the jib in simultaneously... Wink Oh and with one rope/string thing...
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 12 at 12:23am
I can't work out whether that is the work of a genius or a madman John! Just drawing it is quite a feat. Must weigh a fair bit, never mind the expense?!

Graeme, a ballestron rig would do both sails simultaneously but I believe they can making tacking tricky.
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Post Options Post Options   Quote getafix Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 12 at 6:30am
Originally posted by JohnW

As You have had ideas from the Merlins, I thought I would throw in the arrangement that I have on my Albacore, (you know you love them!  Tongue)

I have a single string that adjusts the jib halyard and both shrouds together to control rake, as well as the option to adjust each individually:





Blocks with black centres are fixed, others are running.  The first stage of each cascade (at least) need to to be high tension blocks for example the ones on this page:

To do the single string rake control, you need to know the velocity ratio of your shrouds to your jib/forestay so the strings move the correct amount and retain the tension - On my boat it is 1:2 (as near as) which makes it easy.

Dont bother with muscle boxes (even if you can find them), too much friction for a given velocity ratio that a cascade.



nice one, but what does the green line do? i'm guessing it's shock cord.....
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Post Options Post Options   Quote Lukepiewalker Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 12 at 6:58am
Somewhere buried on swifsolo.org should be details of a single line main and jib trimming system.
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 12 at 7:44am
Ah, I see what's happening now. GRF: you have a nasty case of stringitis.

Its not an uncommon disease of dinghy sailors. Once you get attuned to the potential of using the strings to maniplate things, its quite easy to get seduced by this into have strings for everything, and then quite a lot more.

GRF, you'll just have to face it, you are becoming a dinghy sailor.

The one string jib/main thing has been done a lot of times. Its usually been abandoned too. I don't think adjusting main and jib together is the best way to get upwind.
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 12 at 8:42am
Last thing you want to do when going upwind is free the jib at the same time as the main, surely? The jib is what you are using to judge height, and the main to control power.
I guess you need to come up with a way of having them adjust together unless the jib is cleated, so you can fix it on the beat but have them work together on the reach, when your 3rd and 4th hands are full with the kite...
 
As mr Piewalker says, try the Swift Solo website.
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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 12 at 9:07am
Originally posted by JimC


GRF, you'll just have to face it, you are becoming a dinghy sailor.
  Confused

Nope, I'm the first of a new generation

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Post Options Post Options   Quote rogue Quote  Post ReplyReply Direct Link To This Post Posted: 17 Jan 12 at 9:24am
Originally posted by JimC

Ah, I see what's happening now. GRF: you have a nasty case of stringitis.

I sailed an Etchells once... it had a fine tuner on the jib car.  

The reason Graeme is going on about so much tweaking (from the same keyboard that ridicules the tweaker classes).... well, it keeps the dreaded thing off the water for just a while longer, thus delaying the inevitable D-Day when he realises it a) sucks and b) cost him his pension to find it out.  LOL
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