Laser 161752 Tynemouth |
![]() |
Laser 140101 Tynemouth |
![]() |
Laser 28 - Excellent example of this great design Hamble le rice |
![]() |
List classes of boat for sale |
kicker attachment |
Post Reply ![]() |
Page 123 4> |
Author | |
Blue One ![]() Far too distracted from work ![]() Joined: 09 Nov 13 Online Status: Offline Posts: 317 |
![]() ![]() ![]() ![]() Posted: 29 Oct 14 at 5:01pm |
![]() ![]() |
|
![]() |
|
iGRF ![]() Really should get out more ![]() ![]() Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
![]() ![]() ![]() ![]() |
Er getting the boat back up and getting yourself into it.. ![]() |
|
![]() |
|
iiitick ![]() Far too distracted from work ![]() Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
![]() ![]() ![]() ![]() |
Equally daft idea.....Boat sailing downwind displacement sailing and pushing all that water aside wasting energy to do it. How about storing some of that energy (say a tube with a turbine in it passing through the boat), then farting it back out again at moments of tension like approaching a windless mark or a race to the line. Energy stored by inflating bags.
Anybody else as bored as me?
|
|
![]() |
|
Chris 249 ![]() Really should get out more ![]() ![]() Joined: 10 May 04 Online Status: Offline Posts: 2041 |
![]() ![]() ![]() ![]() |
I think one big issue is that IMHO we are not really sheeting in after a gybe on a board, in effect. We tend to pivot the entire rig around a point about mid way down the boom as we sheet on, IMHO. We pull the mast a significant way to windward and then let the mast and luff fall away, using our back arm as the pivot point. Rather than pulling the back hand in while loaded to get the right sheeting angle, we are essentially letting the front hand out in order to get the right sheeting angle. In boats we can't pull the whole rig into the turn in this way and therefore we don't have the option of gybing this way.
This is just my own belief, from re-playing board gybes in my head and also from the fact that when I am coaching people in longboard high-wind gybes, I really stress that the idea is not to sheet the back hand in, but to let the front hand out. Sheeting the back hand in creates the same sort of problem that Laser 173XXX identified. Sheeting in a dinghy makes it even harder and MM has identified the issue and the way that Grumpf could test it. I've tested this numerous times by losing the mainsheet knot in a Laser and trying to sheet back in with the rig streaming over the bow after I've re-lead the mainsheet. ![]() Yes, you can turn a dinghy so far that there's not much force in the main after the gybe - we even used to do it on offshore racers. But as iiitick noted, you can do that with a conventional setup too.
Edited by Chris 249 - 29 Oct 14 at 11:33am |
|
![]() |
|
iiitick ![]() Far too distracted from work ![]() Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
![]() ![]() ![]() ![]() |
Where is the problem powering up after a gybe? The boat is moving forward, it gybes, you sheet in and 'catch' the wind on the new tack. If it is windy you let the sail flap then sheet in when you feel safe. The trick is to get power immediately by controlling things. Like I don't. How is hauling yards of mainsheet in to pull the boom back from in front of the boat better or safer?
|
|
![]() |
|
iGRF ![]() Really should get out more ![]() ![]() Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
![]() ![]() ![]() ![]() |
You're thinking dinghy style... If you reason windsurf style the board gybes under the rig and the rig only comes back online once the board is planing on the new tack, so you don't let go the sheet so to speak, you actually sheet in going into the turn. So, what would happen with a dinghy would be the difficulty sheeting into a bear off, then there being enough sea/water room for the boom to pass the initial phase of its travel without grounding down, that's the bit that is more concerning. |
|
![]() |
|
iGRF ![]() Really should get out more ![]() ![]() Joined: 07 Mar 11 Location: Hythe Online Status: Offline Posts: 6499 |
![]() ![]() ![]() ![]() |
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 |
|
![]() |
|
Medway Maniac ![]() Really should get out more ![]() ![]() Joined: 13 May 05 Location: United Kingdom Online Status: Offline Posts: 2788 |
![]() ![]() ![]() ![]() |
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. |
|
![]() |
|
laser193713 ![]() Really should get out more ![]() Joined: 13 May 09 Location: United Kingdom Online Status: Offline Posts: 889 |
![]() ![]() ![]() ![]() |
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!
|
|
![]() |
|
iiitick ![]() Far too distracted from work ![]() Joined: 04 Jun 14 Location: gb Online Status: Offline Posts: 478 |
![]() ![]() ![]() ![]() |
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.
|
|
![]() |
Post Reply ![]() |
Page 123 4> |
Forum Jump | Forum Permissions ![]() You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |