Laser 161752 Tynemouth |
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Laser 140101 Tynemouth |
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Laser 28 - Excellent example of this great design Hamble le rice |
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craiggo ![]() Really should get out more ![]() ![]() Joined: 01 Apr 04 Location: United Kingdom Online Status: Offline Posts: 1810 |
![]() ![]() ![]() ![]() Posted: 28 Oct 14 at 8:45pm |
The answer is to have a drum on the mast foot, and a drum of a different diameter (to get the gearing) in the middle of the boat. The mast foot and collar would have to be low friction to allow the rig to rotate very freely. The mast drum and mainsheet drum would be connected by a line, belt or chain. From the top of the drum would be a continuous line which you could run around the boat and this would be your mainsheet.
Its doable but removing all the friction would be tricky. |
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iGRF ![]() Really should get out more ![]() ![]() Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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Blinding!
![]() Thanks craiggo, that could work, belt drive would do it, like off a Harley. |
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iiitick ![]() Far too distracted from work ![]() Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
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But......but....I'm going down wind on me lake and the wind shifts a bit so I sheet out and sail by the lee. It all goes a bit far so I decide to gybe. I head up wind a little bit and the boat gybes. As the boom goes over I give a hearty tug on the mainsheet and the boat accelerates. How can that be improved? Most gybes seem to keep the boat moving or create acceleration. If you are going to push the sail forward you will lose power from the sail. As you haul back in the angle of the sail will be all wrong in relation to the wind, death roll, and it will have to come back a long way before it works and gains drive and stability.
I realise that my faculties are deteriorating with age but of all the ideas worth contemplating is this one worth it?
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iGRF ![]() Really should get out more ![]() ![]() Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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Nothing to stop you gybing conventionally, duck gybing as we proper sailors call it.
All though with my new drum system you wouldn't have to head up then have that nice sickening crash as it comes across. You would just wind it round the front and get that acceleration as you sheet in on the new side. |
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davidyacht ![]() Really should get out more ![]() Joined: 29 Mar 05 Online Status: Offline Posts: 1345 |
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Graeme, I think you should try it ... Fit a Go Pro and share with us,
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craiggo ![]() Really should get out more ![]() ![]() Joined: 01 Apr 04 Location: United Kingdom Online Status: Offline Posts: 1810 |
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You'll need a hell of a lot of mechanical advantage as the centre of effort is well behind the point of rotation but as with David I'd love to see you try it!
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iiitick ![]() Far too distracted from work ![]() Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
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I was going to say that......but......boom fixed to mast, drum round mast with continuous mainsheet round drum. Now this is the cunning bit......a clutch! You can de-clutch and let the mast spin inside the drum.
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laser193713 ![]() Really should get out more ![]() Joined: 13 May 09 Location: United Kingdom Online Status: Offline Posts: 889 |
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The big problem will come when the mast rotates forward and you begin to sheet on again after the windsurf style gybe. Now, in a windsurfer the mast cants around and the board stays relatively flat, the heeling moment of the sail isn't transferred to the board in the same way, not to the same degree anyway. If you have ever sailed a laser and let your mainsheet go right out and sailed heavily by the lee you will know it is a lot of fun but incredibly wobbly. I think this is where you will come unstuck, not the making it work bit, that's easy, people gybe A sails round the front all the time when its windy in big boats, two sheets is the answer there. Big boats are already doing outside gybes, so really this is nothing new.
So to put it simply, you will "death roll" when you sheet in on the new side, you will get wet, your hideously expensive new toy will upset you and will be placed on the bonfire with the v-twin, if that makes it past bonfire night this year!
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Medway Maniac ![]() Really should get out more ![]() ![]() Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
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Exactly, laser'713.
Easy to try, Grumph. Just put a very long mainsheet on one windy day and let the sail right out and bring it in again a few times. You don't actually have to gybe to experience the effect. |
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iGRF ![]() Really should get out more ![]() ![]() Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
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Are you talking about the foiling V Twin? Why would that go on the bonfire? With it's revolutionary new invention of the inflatable mast head foil that will prevent it turning turtle and boost the power off the sail in the same way end plate effect helps the foot.
As to the hideously expensive EPS and it's gybing properties, I already get wet on windy lee running into fast gybes, precisely because of the flow reversal that has to occur. The difference will be that by the time the sail is on the new tack, so will the boat be, as against what can happen at the moment if the wind, apparent or direction change, happen as you gybe and the new heading is all wrong for the freshly crashed sail, it's over you go. The way I'm proposing the take up on the new tack, like windsurfing, is progressive, it's exactly for windy conditions I need to do something else, gybing 9.4 sq mtrs with only 67 kgs to counter that crash gybe is very very difficult. I've spent many an hour postulating as to why boats are faster running by the lee and why they rock about so much, indeed I had a couple of hours to consider it running dead downwind running the Icon jib by the lee to enforce the thinking, so I do know what goes wrong and why. Edited by iGRF - 29 Oct 14 at 9:27am |
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