New Posts New Posts RSS Feed: The latest 'project'
  FAQ FAQ  Forum Search   Register Register  Login Login

The latest 'project'

 Post Reply Post Reply Page  <1 910111213 19>
Author
yellowwelly View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 24 May 13
Online Status: Offline
Posts: 2003
Post Options Post Options   Quote yellowwelly Quote  Post ReplyReply Direct Link To This Post Topic: The latest 'project'
    Posted: 07 Nov 13 at 2:08pm
it's a eureka moment, unfortunately us sub-genii status beings are not supposed to understand... we are just to smile and say 'wow', whilst patiently waiting to be astounded by its on-the-water performance in due course.

Edited by yellowwelly - 07 Nov 13 at 2:09pm
Back to Top
Dougal View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 23 Sep 09
Location: England
Online Status: Offline
Posts: 556
Post Options Post Options   Quote Dougal Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 2:17pm
Originally posted by iGRF

Woke up this morning with a Eureka moment, think I may have an idea to make my symmetric kite work asymmetrically on either tack.

So, what about this..

Top of the kite on a batten track (batten and a bit of line through the pulley) when you sheet it the kite pulls to one end of the track, leaving the new trailing edge supported by the batten, which then twists off to leeward.

Simples.

Save your applause for later, just for now tell me why it won't work.

I think I get it.  Wouldn't the effect of sheeting in pull the head of the kite into the wind shadow of the main?
What could possibly go wrong?
Back to Top
yellowwelly View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 24 May 13
Online Status: Offline
Posts: 2003
Post Options Post Options   Quote yellowwelly Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 2:23pm
wouldn't the wind be coming from the front as the new craft is so damn fast?
Back to Top
JimC View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 17 May 04
Location: United Kingdom
Online Status: Offline
Posts: 6660
Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 2:24pm
I think I see what he means - if I'm right the top of the kite is squared off with a batten in, and there's a line from each end of the batten, and the halyard rides on the line. If the line is taut enough the halyard will run to the windward corner of the square top, leaving the leeward corner floating.

*If* I'm right I can see how it will give a degree of asymmetry to the sail head, but I'm having trouble seeing why it should set better. Bearing in mind the problem with kites running deep is that the top is excessively twisted off against the clew I'm not sure its an advantage.

The other thing that confuses me is that you seem to be regarding one of the biggest advantages of the sprit kite - that you gybe it like a jib with two of the corners firmly located - as being a disadvantage. One of the worst things about gybing a pole kite is that the thing is so unconstrained in mid gybe. With a sprit kite setup you can handle a far bigger kite simply because the thing is so better disciplined.

The other thing you need to consider is that unless your sprit/whatever is cocked up in the air at some ludicrous angle then the clew will be somewhere about the waterline when the kite is sheeted correctly on a reach - unless of course you have some stupidly short pole like too many of the pole kite dinosaurs.

Edited by JimC - 07 Nov 13 at 2:27pm
Back to Top
iGRF View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 07 Mar 11
Location: Hythe
Online Status: Offline
Posts: 6499
Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 2:39pm
Yes, well spotted the trailing edge would be in the wind shadow of the main, obviously half a mast width, but the effect i'm hoping for would be to twist the lower bit which always is in the mains wind shadow.

Point also taken (jim) regarding the advantage of assym, which never having experienced the 'old' way I probably don't fully appreciate, all I do know is the gybe can be a fairly stressful affair with the kite dragging around the forestay, both on us and the kite, my system would still mean the foot of the kite is constrained, but by a connecting line between it and the clew. So it's cut with a low clew/foot which changes when you slide it across. Obviously if that doesn't work there's nothing to stop it being fixed and gybing conventionally, but I still think having it in a symmetric sail plan could have advantage for jibsticking it on the runs... Why all this? To do away with swinging pole and maintain some competitive dead running performance.

Oh and short pole, probably because it's not going to be that big a kite, <10mtr...

Edited by iGRF - 07 Nov 13 at 2:43pm
Back to Top
iGRF View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 07 Mar 11
Location: Hythe
Online Status: Offline
Posts: 6499
Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 2:47pm
I'm useless at these electronic drawing programmes and I've lost my iPad stylus thing, but I can see an illustration would paint a thousand words, so I will try later..
Back to Top
Rupert View Drop Down
Really should get out more
Really should get out more


Joined: 11 Aug 04
Location: Whitefriars sc
Online Status: Offline
Posts: 8956
Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 3:02pm
With a small kite, the act of bearing away usually seems to be enough to take most of the pressure off as it passes round the forestay. It is certainly possible to gybe an assy where it fills nicely with a pop as soon as it is round.
I think I'd we working on a kite shape that can reach well, and then pop round onto a goosewing for short runs with a whisker pole system that doesn't involve any aiming of hooks. Problem is that the jib stick system that the Icon currently has couldn't be fitted onto a kite that has to gybe round a forestay, as far as I can see. Otherwise, it would work both to windward and to leeward on a flat cut kite.
Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
Back to Top
iGRF View Drop Down
Really should get out more
Really should get out more
Avatar

Joined: 07 Mar 11
Location: Hythe
Online Status: Offline
Posts: 6499
Post Options Post Options   Quote iGRF Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 3:15pm
Originally posted by Rupert

With a small kite, the act of bearing away usually seems to be enough to take most of the pressure off as it passes round the forestay. It is certainly possible to gybe an assy where it fills nicely with a pop as soon as it is round. I think I'd we working on a kite shape that can reach well, and then pop round onto a goosewing for short runs with a whisker pole system that doesn't involve any aiming of hooks. Problem is that the jib stick system that the Icon currently has couldn't be fitted onto a kite that has to gybe round a forestay, as far as I can see. Otherwise, it would work both to windward and to leeward on a flat cut kite.


Why's that rupert? Does it not already goosewing the jib? Surely if it were a tad longer it could equally goose wing a kite?
Back to Top
Rupert View Drop Down
Really should get out more
Really should get out more


Joined: 11 Aug 04
Location: Whitefriars sc
Online Status: Offline
Posts: 8956
Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 3:23pm
You'd either need a twin pole system or a way of getting the pole from one side of the boat to the other after the gybe - or it is on the wrong side of the jib. Taking it round the front would slow things down to the point where you'd be right about the drag, or you could unhook and swap it on the sheet. However, I'm sure a clever chap could work out a way of having both windward and leeward capability without having to unhook anything. For me, 2 poles would be the way to go. In fact, forget the bowsprit at all, and have a twin dangly pole system on your symmetrical kite.
Firefly 2324, Puffin 229, Minisail 3446 Mirror 70686
Back to Top
iitick View Drop Down
Far too distracted from work
Far too distracted from work


Joined: 09 Sep 13
Location: Tunstead Milton
Online Status: Offline
Posts: 392
Post Options Post Options   Quote iitick Quote  Post ReplyReply Direct Link To This Post Posted: 07 Nov 13 at 3:38pm
Another idea.........a sodding great big genoa with a reduction on the sheet and a tricky little line running forward to pull it round the mast and a furler. Then an equally sodding great symetric, as 505 on a twin pole system, as Mer**n Ro**et.


Back to Top
 Post Reply Post Reply Page  <1 910111213 19>

Forum Jump Forum Permissions View Drop Down

Bulletin Board Software by Web Wiz Forums® version 9.665y
Copyright ©2001-2010 Web Wiz
Change your personal settings, or read our privacy policy