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Topic: room under boom |
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Mark Allatson ISO685 |
Posted: 14-Jul-08 10:47 |
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We need a bit of advice about rig setup - we were out yesterday in a fairly decent blow and after attending the training session we had the kicker pulled on hard and this worked well as we sailed along. Where we had a problem though was at the tacks, it was very difficult to get under the boom, I found it was scraping my back even when I was virtually lying on the deck and even Charlie was struggling and he is a small crew. Any suggestions? i was wondering if the mast is too raked or maybe I need some/more swatcher on to reduce mast bend? The ISO setting guide says swatcher off in stronger winds - so maybe I need more rig tension although couldn't pull any more on. All ideas welcome.
Mark |
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Pete Lindley |
Posted: 14-Jul-08 11:04 |
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Your main wasn't at the top of the mast.
If you had the rig tension on with the correct rake, then the swatcher will make a difference, but not that much.
Top two links in the mainsheet section:
http://www.isoracing.org.uk/iso_guides/isotweaks/index.html
Pete
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Neil Ashby |
Posted: 14-Jul-08 13:17 |
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Hi Mark
You shouldnt have any problems getting under boom with full kicker on if everything is set up correctly as pete says. I guess your running on around 7300 mm rake with 300 to 350lbs tension if so all should be fine. failing that let some of the kicker off in between tacks which isnt a bad idea if really windy!
Neil |
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Mark Allatson ISO685 |
Posted: 14-Jul-08 13:32 |
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Hi Guys,
Thanks for the advice. I'm pretty sure the mast was up to the top beacuse I have been using Bob's idea of the floating cleat - but I will check next time. I think maybe I didn't have enough rig tension on because I think the mast seemed to have too much bend in it. When pulling on the tension - would you normally have someone push the mast forwards or is it usually enough just to yank the jib rope hard? I know it should be OK because Pete checked it at KGSC a couple of weeks back, a further play around with the tension gauge is required I think. A further thought - could it have anything to do with not having enough Cunningham on, I'm not sure if I had enough pulled on.
Mark |
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Pete Lindley |
Posted: 14-Jul-08 14:27 |
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Hi Mark,
Put the mast in the boat, lean the mast back in the gate and wherever the shrouds dangle, then stick the pins in the chainplates.
Check the mast for sideways wobble and pack out as necessary.
Pull the jib up and apply rig tension. Just pulling on the rig tension rope is enough to get the required amount.
With the swatcher off, check the rig tension on the shroud.
Snug up the swatcher and all done.
When sailing you may find the leeward shroud is just loose. This is ok for you guys. The boom will be high enough like this.
The kicker - when fully off, are all the blocks touching each other at the top?
When you have the kicker on as you mention in this thread, where is the double block in relation to the bottom of the mast?
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Mark Allatson ISO685 |
Posted: 14-Jul-08 16:05 |
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Pete,
I have noticed that the leeward shroud tends to be quite loose when sailing in higher winds. I'm not sure about the position of the blocks on the kicker, where should they be? |
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Pete Lindley |
Posted: 14-Jul-08 19:36 |
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With the kicker off, the three blocks should all be touching each other at the top. If they're not, then you won't be able to pull enough kicker on and you will lose control and performance.
With your old boom that is bendy and sobstads - pull a lot, then when you think that's it, pull it a bit more most probably 4" from the bottom on a windy day. Up the rig tension a little to 320lbs if you want, but the more rig tension you use, then the more you will have to work to control the boat as it won't be as self de-powering for you, so your skills will be needed. |
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Mark Allatson ISO685 |
Posted: 14-Jul-08 20:59 |
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I think a bit more playing with the set-up is required - on a positive note Pete I did find the boat a lot more controllable with lots of kicker on and we were able to go fast up the beats etc. Charlie was enjoying a sprayful time out on the wire! Unfortunately we managed two comedy capsizes when accidentally bearing away and going in to windward after a dropped mainsheet on my part - whoops! |
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Lloyd Walker |
Posted: 15-Jul-08 14:54 |
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One last thought; is your mast bent aft? If it is as you pull on the kicker instead of the mast resisting it will bend easily and the whole lot comes back more than it should. The boom then becomes lower. Worth checking. It should be almost straight fore and aft with no tension.
[Edited by Lloyd Walker on 15-Jul-08 14:55] |
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Mark Allatson ISO685 |
Posted: 15-Jul-08 15:11 |
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I'll have a look Lloyd - it does have a sideways bend when free which straightens when the shrouds are on but I haven't noticed a fore/aft bend. We could do with a new mast really but they cost a prodigious amount so I haven't been able to justify it so far. |
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