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yellowhammer View Drop Down
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Posts: 270 		Post Options Post Options   Quote yellowhammer Quote  Post ReplyReply Direct Link To This Post Topic: Battened Jibs
    Posted: 15 Mar 06 at 8:28pm

back on track, are battened mylar jibs harder to read (less sensitive) than dacron, or is it still simply a case of watching the telltales?

are they more suited to high performance skiffs, or have any conventional classes adopted them?

what's the normal batten spacing to avoid the motoring leech effect?
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Chew my RS View Drop Down
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Posts: 790 		Post Options Post Options   Quote Chew my RS Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 06 at 4:37pm

Originally posted by tickel

What I cant undestand is how a jib works in relation to the main. You keep the telltales streaming and cotrol the slot which accelerates air over the back of the main but the back of the main is a low pressure area, now being filled with high pressure air. Can someone explain?

Sorry to go off track, but if you are interested Arvel Gentry has written the definitive, correct, explanation of 'slot effect' in a series of magazine articles (not Y&Y ). http://www.arvelgentry.com/magaz.htm



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carshalton fc View Drop Down
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Posts: 2337 		Post Options Post Options   Quote carshalton fc Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 06 at 4:25pm
well the only thing i can think of is that they cant be furled compared to a soft jib which can be furled.
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Stefan Lloyd View Drop Down
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Posts: 1599 		Post Options Post Options   Quote Stefan Lloyd Quote  Post ReplyReply Direct Link To This Post Posted: 15 Mar 06 at 5:49am
A class I used to sail switched to battened jibs. They were neither noticeably faster or slower but they definitely lasted longer.
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Medway Maniac View Drop Down
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Posts: 2788 		Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 06 at 11:21pm

You're right, Tickel, the flow off the jib does increase the pressure over the adjacent part of the back of the main and even reduce it's thrust to that extent, but it also injects energy into the airstream over the lee-side of the main and allows the flow to stay attached (i.e. avoid stalling) even though you sheet it much closer to the centreline than you could a una rig (main only); that ups the thrust again.

So, back to battened jibs, please!
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tickel View Drop Down
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Posts: 408 		Post Options Post Options   Quote tickel Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 06 at 10:42pm
What I cant undestand is how a jib works in relation to the main. You keep the telltales streaming and cotrol the slot which accelerates air over the back of the main but the back of the main is a low pressure area, now being filled with high pressure air. Can someone explain?
tickel
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 06 at 8:21pm

I 2nd calum's point, they do hold their shape a lot better when the breeze is on.  Mostly it helps keep a good leech shape and takes away that motoring leech factor which is never going to be quick.  The only real disadvantage ive ever experienced with them is in Hobie 16's in the light winds where the battons stop the jib from going past the mast when tacking or gybing so you have to physically bend the jib and throw it. 

Doug



Edited by Doug.H
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Calum_Reid View Drop Down
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Posts: 59 		Post Options Post Options   Quote Calum_Reid Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 06 at 7:44pm
hold there shape better making them easier to sail to. dont get trashed as easily from flogging.
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Medway Maniac View Drop Down
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Posts: 2788 		Post Options Post Options   Quote Medway Maniac Quote  Post ReplyReply Direct Link To This Post Posted: 14 Mar 06 at 7:43pm

What are people's views on battened jibs?

What are the advantages (apart from looking cool)?

What are the disadvantages (apart from not being able to furl them)?

Let's have your experiences.
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