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iGRF View Drop Down
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    Posted: 07 Sep 18 at 2:22pm
Originally posted by Sam.Spoons

Yes that's what we have on the Blaze, typically the lowers have a little slack to allow some bend before they become tight as we are not allowed to adjust them (or forestay/rig tension) while racing. ]


Another stupid class rule and good reason not to use a Blaze, thanks for reminding me, I had a go in one at the weekend as part of my 'where do I go next?' end of season thinking, I expect it's the same with the Contender, no wonder the Phantom does so well.
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Posts: 3401 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 18 at 10:35am
Yes that's what we have on the Blaze, typically the lowers have a little slack to allow some bend before they become tight as we are not allowed to adjust them (or forestay/rig tension) while racing. We use kicker to depower upwind (actually the converse, we use no kicker upwind until we are overpowered) and the mainsheet to control leech tension. Offwind the kicker does the usual stuff, controlling leech tension/twist.
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Posts: 3011 		Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 18 at 10:04am
Originally posted by Sam.Spoons

...

Will read that other thread later but a kicker pushes gooseneck into the mast, a gnav pulls the gooseneck and pushes at the mast end of the gnav so the primary bending effect is higher with a gnav. Both tighten the leech which will pull the mast tip aft and down. 


You could allow the top of the gnav strut to bend the mast, but normal practice seems to be to fit lowers which prevent this. It ties in with the rig concept of fixed bend in the bottom half, flexible at the top, as exemplified by various Bethwaite rigs and others.
Equally, you can have lowers with a string vang, like a typical Merlin.
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Posts: 3401 		Post Options Post Options   Quote Sam.Spoons Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 18 at 8:11am
Originally posted by 423zero

Rupert,
Heard that before regarding bend, presumably it pushes mast forwards ?

Will read that other thread later but a kicker pushes gooseneck into the mast, a gnav pulls the gooseneck and pushes at the mast end of the gnav so the primary bending effect is higher with a gnav. Both tighten the leech which will pull the mast tip aft and down. 


Edited by Sam.Spoons - 07 Sep 18 at 8:13am
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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 07 Sep 18 at 6:54am
detailed analyses on kicker/vang from 2008
https://www.yachtsandyachting.com/forum/forum_posts.asp?TID=4639&title=gnav-vs-kicker
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Posts: 437 		Post Options Post Options   Quote zippyRN Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 18 at 11:05pm
Originally posted by davidyacht

I suspect that the greatest risks to life and limb are from;
1.  Safety boats operating one up
2.  Safety boats operated by incompetent crew
3.  Safety boats operated by competent crew
However 1 and 2 are the reality that many races are held under.  To do anything about it would see many dinghy races binned.  The evaluation of this is probably the most challenging aspect of a Race Officers Duty.

far too much like sense  for on here ... 
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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 18 at 9:31pm
Rupert,
Heard that before regarding bend, presumably it pushes mast forwards ?
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Posts: 8956 		Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 18 at 8:44pm
Shame a gnav changes the bend characteristics of a mast, so adding one to a currently kickered boat isn't a good plan for speed. Could work for a cruising boat, though.
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Posts: 3011 		Post Options Post Options   Quote RS400atC Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 18 at 8:42pm
Originally posted by Sam.Spoons

I thought the same thing when the first 'trapped by the kicker' post appeared. I think it would be much less likely as the sail prevents anything going through the gap, completely on one tack and mostly on the other. I suspect the Gnav was not developed with that in mind though.....

The gnav generally comes with lower shrouds, which I think takes us back to L4k and possibly other incidents.
I've known someone get their (long) hair caught in a cascade kicker when the helm released the kicker after a capsize.
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Posts: 3420 		Post Options Post Options   Quote 423zero Quote  Post ReplyReply Direct Link To This Post Posted: 06 Sep 18 at 8:09pm
Certainly makes more room for crew, looks like it could also have a safety benefit too.
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