Rigging question.

   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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JimC Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6661	Post Options Post Reply Quote JimC Report Post Quote Reply Topic: Rigging question. 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.

423zero Send Private Message Find Member's Posts Really should get out more Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420	Post Options Post Reply Quote 423zero Report Post Quote Reply 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.

JimC Send Private Message Find Member's Posts Visit Member's Homepage Really should get out more Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6661	Post Options Post Reply Quote JimC Report Post Quote Reply 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.

423zero Send Private Message Find Member's Posts Really should get out more Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420	Post Options Post Reply Quote 423zero Report Post Quote Reply Posted: 27 Jan 19 at 8:26pm
	Tiller is quite long, so could certainly be moved forward, will have a look.

Rupert Send Private Message Find Member's Posts Really should get out more Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956	Post Options Post Reply Quote Rupert Report Post Quote Reply 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, Puffin 229, Minisail 3446 Mirror 70686

Sam.Spoons Send Private Message Find Member's Posts Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3400	Post Options Post Reply Quote Sam.Spoons Report Post Quote Reply 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
	Spice 346 "Flat Broke" Blaze 671 "supersonic soap dish"

423zero Send Private Message Find Member's Posts Really should get out more Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420	Post Options Post Reply Quote 423zero Report Post Quote Reply Posted: 27 Jan 19 at 8:43pm
	Rupert, I used a 'Skipper mast.

Sam.Spoons Send Private Message Find Member's Posts Really should get out more Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3400	Post Options Post Reply Quote Sam.Spoons Report Post Quote Reply 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).
	Spice 346 "Flat Broke" Blaze 671 "supersonic soap dish"

Rupert Send Private Message Find Member's Posts Really should get out more Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956	Post Options Post Reply Quote Rupert Report Post Quote Reply 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, Puffin 229, Minisail 3446 Mirror 70686

423zero Send Private Message Find Member's Posts Really should get out more Joined: 08 Jan 15 Location: United Kingdom Online Status: Offline Posts: 3420	Post Options Post Reply Quote 423zero Report Post Quote Reply Posted: 27 Jan 19 at 9:03pm
	Me too, I can't get the hang of it at all.