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Mainsheet double bridle |
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RS400atC 
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Joined: 04 Dec 08 Online Status: Offline Posts: 3011 |
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 Topic: Mainsheet double bridlePosted: 05 Jan 17 at 10:28am |
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Years ago I tried putting the ratchet on the boom of a solo.
Didn't work at all, too much wrap angle, wouldn't ease at all. Modern rope probably makes a difference? |
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JimC
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Joined: 17 May 04 Location: United Kingdom Online Status: Offline Posts: 6662 |
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Posted: 05 Jan 17 at 11:46am |
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At a guess we probably get less grip from the ratchet blocks with the smaller ropes we use these days.
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Cirrus
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Joined: 29 Oct 15 Location: UK Online Status: Offline Posts: 590 |
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Posted: 05 Jan 17 at 12:29pm |
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Years ago I tried putting the ratchet on the boom of a solo. Didn't work at all, too much wrap angle, wouldn't ease at all. Modern rope probably makes a difference
Fully understand - But if you were rear-sheeting but with ratchet off the boom above the front of the cockpit you do get the 'right' amount of ratchet in play. Might not work for the Solo, or even be allowed for all I know but there are a number of general benefits. 'Traditionalists' can find it hard to learn 'new tricks' but if allowed by your class it is worth trying for a couple of months. Sheet loadings can be greatly reduced, encouraging you to play the main as you should rather than cleating the sheet off as things get tough. It also serves to clear the cockpit of many obstructions .. so you keep your body further forward when tacking (very advantageous in some classes if you are heavier) and there are other advantages ..... I know some will not agree - But I'm not asking them to endorse it But if your class allows it then what have you got to lose in trying ? .. or in allowing others from trying it ? Edited by Cirrus - 05 Jan 17 at 12:32pm |
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RS400atC
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Joined: 04 Dec 08 Online Status: Offline Posts: 3011 |
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Posted: 05 Jan 17 at 3:52pm |
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I think being allowed to get rid of the hoop and use a rear bridle in the 400 would be interesting.
It would make moving forwards in light airs less of a comedy for starters! But any change of sheeting can have subtle effects. When you ease the sheet on a 400 for instance, you are losing leach tension as well as letting the boom to leeward. Less so with more kicker on, but very significant in light air. Sheeting off the boom you might need to use more kicker and less sheet, to avoid pulling the boom too far up to weather. Less sheet means less forestay tension, so more jib luff sag. The interconnected-ness of strings. I think the double bridle possible keeps things more repeatable than sheeting off the boom? |
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Posted: 05 Jan 17 at 4:03pm |
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sorry, double post
Edited by mozzy - 05 Jan 17 at 4:20pm |
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Posted: 05 Jan 17 at 4:16pm |
But, it doesn't look like they are taking the main off the boom in either photo or diagram. So they're not really 'clearing the cockpit'. I guess they've gone down this route because playing the main frequently is fatiguing, but adding another purchase would end up with an unworkable amount of rope in the boat, and a slower gust response (because you have to sheet more for the same sheeting effect). The downside of doing a full wrap on the ratchet (or adding another ratchet as I've seen before) is that it chews rope, and can add too much friction when the wind drop (but they can be tuned off). Adding ratchets also doesn't decrease the load when sheeting in, so if you'r struggling to pull in at all you have no other option than to add purchase. |
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Cirrus
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Joined: 29 Oct 15 Location: UK Online Status: Offline Posts: 590 |
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Posted: 05 Jan 17 at 5:34pm |
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But, it doesn't look like they are taking the main off the boom in
either photo or diagram. So they're not really 'clearing the cockpit'.
The point I am making is different - IF you go for rear sheeting THEN you can also run the mainsheet along the boom and have the ratchet directly attached either in front of the helm or opposite them.. The result is a totally clear cockpit and the crew can move around without restriction. If you like think of something like a Laser BUT with the ratchet directly attached to the boom (But I'm pretty sure the die-hard laserists would of course ban such a radical 'innovation' as being 'not invented here' etc)  Edited by Cirrus - 05 Jan 17 at 5:38pm |
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Sam.Spoons
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Joined: 07 Mar 12 Location: Manchester UK Online Status: Offline Posts: 3401 |
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Posted: 05 Jan 17 at 6:28pm |
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I'll second off the boom sheeting with a rear bridle on the Blaze, I was skeptical before I tried it but it is way better on several counts (much lighter sheet loads and the clear cockpit being the main two). I might move the ratchet block to a point opposite my upwind position as It's hard to use two hands with it off the kicker attachment.
The 'nova arrangement is quite different though, a centre mainsheet with the last turning block at around deck hight instead of on the floor/turret. The only reason I can think of is to get the mainsheet lower than off the boom. The extra wrap idea makes sense but as most ratchet blocks work fine with the sheet in contact for only around ¼ of the circumference I'm not convinced that is the reason.
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Dave.B
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Joined: 03 Mar 09 Online Status: Offline Posts: 38 |
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Posted: 05 Jan 17 at 9:21pm |
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On my Farr I use a rear bridle, run the mainsheet along inside the boom to a Ronstan pivoting ratchet block. This results in a completely clear cockpit and a nice direct angle for off boom sheeting. Works great from the trapeze. I use 1:1 when it's lighter and pass through a turning block on the bridle (shown) for 2:1 when the breeze is on.
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H2 148
H2 113 RS300 365 Farr 3.7 397 Build Blog http://davesfarr37project.weebly.com/ |
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Rupert
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Joined: 11 Aug 04 Location: Whitefriars sc Online Status: Offline Posts: 8956 |
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Posted: 05 Jan 17 at 9:32pm |
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Not singlehanded, but I'm using the off boom arrangement on the Leader. Leaves far more room for the crew. Not sure how it will work with added spinnaker.
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Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
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