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What gives a boat 'height'? |
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ellistine ![]() Really should get out more ![]() ![]() Joined: 06 Mar 08 Online Status: Offline Posts: 762 |
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Thanks Roy. I'll have a look at lunchtime.
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Roy Race ![]() Far too distracted from work ![]() ![]() Joined: 15 Aug 07 Location: United Kingdom Online Status: Offline Posts: 275 |
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Fair enough. I've never sailed a Vago, but a lot of the principles will apply, whether you achieve leech tension with the kicker or the mainsheet. The principles are: Helm to sit still. Stop adjusting the mainsheet when it's not necessary. Steer in a straight line! Division of labour: Make it the crew's job to keep the boat flat through gust/lull cycles. After all, they have a trapeze and you don't. That's what it's there for! Trust them to do this job and make it easier for them by steering straight, not adjusting the main and sitting still. |
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Roy Race ![]() Far too distracted from work ![]() ![]() Joined: 15 Aug 07 Location: United Kingdom Online Status: Offline Posts: 275 |
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Topic: What gives a boat ’height’?
Answer: 1. Sound sailing technique 2. The rig / foils / other stuff |
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ellistine ![]() Really should get out more ![]() ![]() Joined: 06 Mar 08 Online Status: Offline Posts: 762 |
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This is also an area of slight concern. The Vago normally has a horse/strop with it's height set to be block to block. Even though I could adjust the height before launching, it never seemed to be in the right place. The kicker would obviously move the height of the blocks and switching between the XD sail and the standard main would also mean a re-adjustment. I've recently ditched this in favor of a split tail main sheet so it's always centered without going block to block and I can also then control leach tension with the main sheet (all very "Higher and Faster"!). Previously I had been using the GNAV for leach tension but something Grumpf said about his ASBO and the fact that the GNAV bent the mast more than it pushed down the boom (which it also does on the Vago) lead me down the main sheet tension road. Am I right in my thinking or am I causing myself more problems? P.S. I do tend to over analyse things! Edited by ellistine |
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Roy Race ![]() Far too distracted from work ![]() ![]() Joined: 15 Aug 07 Location: United Kingdom Online Status: Offline Posts: 275 |
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You might be over-analysing, I don't know! Certainly,
the rig is a factor and a gnav, conventional kicker and using mainsheet tension will have different effects on mast bend. You need to be able to get the boom into the centreline or very close to it and still have control over the leech tension somehow. However you achieve this is up to you. I think the main point is that once you've got a decent, workable set-up, not to spend too much time worrying about it and first concentrate on good, sound sailing technique. You need look no further than that 470 clip as an example of how to sail a single trapeze boat upwind in marginal conditions and aspire to that. If you can get that basic technique even half right, you'll already be blowing 90% of the rest of the Vago fleet out of the water and you also then have solid foundations on which to go forward and start worrying about other stuff, like which way to go! |
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Roy Race ![]() Far too distracted from work ![]() ![]() Joined: 15 Aug 07 Location: United Kingdom Online Status: Offline Posts: 275 |
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Oh, and the 470 uses a centre strop mainsheet system,
with leech tension adjusted with the mainsheet. The kicker is usually adjusted so as to be "snug" and stop the boom rising too much. Inland or in gusty conditions, the kicker will have to be used more, as there's more mainsheet movement, but on the sea in sub full-power conditions, the main is set up solely with the strop / sheet arrangement, the boom centrelined, cleated and left alone. |
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Jack Sparrow ![]() Really should get out more ![]() ![]() Joined: 08 Feb 05 Location: United Kingdom Online Status: Offline Posts: 2965 |
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Not in the clip you linked too. You can see the helm easing the main sheet and the boom end not rising. So kicker is controlling leech tension in the video. Sounds like I'm being pedantic, which I suppose I am, even though I agree with what you are saying.
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Roy Race ![]() Far too distracted from work ![]() ![]() Joined: 15 Aug 07 Location: United Kingdom Online Status: Offline Posts: 275 |
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You're right. Especially in the beginning of the video,
when there's more wind. You would have no option other than to have the kicker controlling leech tension when the sheet needs to be eased regularly. The 470 has a set-up where the floating block can be over-centralised by shortening the windward strop. You can see the helm doing this shortly after the tack at 0.55. It's quite fiddly though. On a sea course, where you can get settled into a tack for a decent amount of time, they do slacken off the kicker and have the mainsheet / strop arrangement taking most of the leech load upwind in light airs. It just seems to be faster. Don't know why. On a lake, the reality is that there's less time to settle and the kicker will be used more. Even so, I'd say there's a substantial amount of downward pull in the mainsheet in the latter part of the vid, when the wind is lighter, so the leech load is shared by mainsheet and vang. Of course, upon easing the sheet (which we don't get to see in the lighter wind), the boom would only have to rise by a centimetre to transfer all the load back onto the vang. |
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redback ![]() Really should get out more ![]() ![]() Joined: 16 Mar 04 Location: Tunbridge Wells Online Status: Offline Posts: 1502 |
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I used to sail and train in Lasers. Now there's not
going to be much difference between Lasers if properly setup and yet some people just outpointed everybody else. This got me thinking and I wonder if you are suffering from the same problem. If there were no wind at all but you still had a little way on, what would be the best angle to point? Well the answer is straight at the mark and yet I see novices all the time let the boat bear away as the gust eases. Its natural as the boat heels to leeward it rounds up and when the wind eases the boat bears away. That is not the fastest way up a beat and when you look at the boats around you they all seem to work their way up to windward and so you think your boat doesn't point. So here's how to do it. Get the boat setup as advised above and then steer it. Gain speed in the gusts by driving the boat a bit - which may mean easing the main, but don't let the boat heel. When you have speed, head up enough to maintain speed and this will most often mean trimming the sails in a bit. In the lulls head up a bit more and trim the sails really flat and narrow. As the boat looses speed you'll have to gradually bear off a bit and ease the sails to get back to the optimum settings for maintaining speed. Its a bit like having a 3 speed gear box. 1st gear is for acceleration and its open leached, 2nd gear is for maintaining cruising speed, tighter leached but the sails should not be too flat and 3rd gear is "point at all costs". You don't use 1st gear very much unless there's a hell of a chop and not much wind. 2nd gear is the one you'd use in a steady wind - its the optimum for windward work. And 3rd gear is like a very high gear - hopeless for dealing with gusts but it'll give you a little drive whilst you point up. Naturally these gears are slightly different in the way they are implemented according to average wind speed. And just as a rider the gears are different according to the type of boat, for instance a Laser 4000 is very different from a Laser. It sounds complicated doesn't it, but then sailing a boat to windward is difficult and that's the challenge. |
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ellistine ![]() Really should get out more ![]() ![]() Joined: 06 Mar 08 Online Status: Offline Posts: 762 |
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I forgot about this post. Here's an update; This sunday our club organised and Asymmetric training
I found it extremely useful to the point that on
Leach tension. What I thought was tight was still
Aim to sail with 5 degrees of windward heel (which in
Pay more attention to the windward telltale and less
I also moved the shrouds up two holes and bought some
Anyway, I'm hoping we're not becoming pure lightwind
Edited by ellistine |
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