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Rigging question.

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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 7:40pm
It really doesn't matter where you sheet it, for the same sheet load you'll have the same amount of rope. Try modelling it with string and you'll see what I mean. 2:1 end of boom, 4:1 mid boom, it's the same amount of string.
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 7:55pm
The 4to1 system I have on at the moment is attached a quarter of the way along boom from mast, the mainsheet is very short, hardly any mainsheet to speak of when going upwind, this is why I thought mixing existing 4to1 with a feed along boom and down to a traveller would reduce amount of rope in cockpit compared to 'Laser' set up.
Will follow advice and experiment with both systems.
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 8:14pm
You might just about get away with bridle to boom, without a purchase. We used that on Cherubs back in the 80s, but on the Moth I felt I needed the extra. I tried a lot of options. Another possibility might be to move the bridle forward a bit. It doesn't necessarily have to be right at the stern.
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 8:26pm
Tiller is quite long, so could certainly be moved forward, will have a look.
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 8:30pm
Standard aft main works fine with the Minisprint. I expect you have used it on the Enterprise?

Oddly, I'm thinking if going the opposite route on Minim,putting a 4:1 behind the dagger board case. Thinking about a dagger rudder, which would be easily caught on an aft main. Would a boom made from a Mirror mast be strong enough?
Firefly 2324, Lightning 130, Puffin 229, Minisail 3446
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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 8:37pm
Moving the bridle forward might mean you'll be sitting on it (which is much more uncomfortable than you might expect) offwind in extreme conditions. 

If your existing 4:1 is only 25% back from the mast it is roughly equivalent to 1:1 off the back of the boom. the 3:1 centre plus 1:1 aft setup in your drawing will increase both the purchase and the mainsheet working length by 1.75 (so nearly twice the rope) but will significantly reduce the sheet loads.

Using a 2:1 at the back minimises the number of blocks and is more efficient but you would end up with even more rope. Maybe it is worth trying a sort of semi-centre mainsheet with the take off and bridle a bit forward?

But if you could get used to off the boom then a ratchet at halfway along the boom and a 1:1 at the back would give you 1.5:1 which might be the best compromise (and only two friction inducing blocks). 


Edited by Sam.Spoons - 27 Jan 19 at 8:40pm
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423zero View Drop Down
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 8:43pm
Rupert,
I used a 'Skipper mast.
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Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 8:48pm
I've always hated aft mainsheets (which were almost de-riguer when I started sailing, the OK with a centre mainsheet was pretty modern back then).

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Rupert View Drop Down
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 9:01pm
Seems to depend upon what you grew up with. As a Firefly sailor, I had to spend time learning centre main when I converted my British Moth in the 90s. Each has its benefits, and there is no intrinsic speed difference.
Firefly 2324, Lightning 130, Puffin 229, Minisail 3446
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Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 27 Jan 19 at 9:03pm
Me too, I can't get the hang of it at all.
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