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cad99uk View Drop Down
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Posts: 187 		Post Options Post Options   Quote cad99uk Quote  Post ReplyReply Direct Link To This Post Topic: Cirrus Icon Development
    Posted: 14 Jan 11 at 2:54pm
I use them to control the stiffness of the upper section and hence the gust response - upwind.
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Neptune View Drop Down
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Posts: 1314 		Post Options Post Options   Quote Neptune Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 3:09pm
I can't think of many, if any, kiteless and hiking boats that have uppers.  They don't even bother on the NS14
Musto Skiff and Solo sailor
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cad99uk View Drop Down
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Posts: 187 		Post Options Post Options   Quote cad99uk Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 3:11pm
Originally posted by Neptune

I can't think of many, if any, kiteless and hiking boats that have uppers.  They don't even bother on the NS14
Do they all have thin carbon masts?
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 3:19pm
Hi
yes there are no uppers, so it is similar to a 200 etc in that sense. Except it has a bespoke carbon mast and fully battened square head, so it should prove very responsive and controllable via the downhaul and kicker. The main is fairly large so I think will probably be set in a different way to some other boats, but don't think uppers are needed.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 3:25pm
Continued so as not to be timed out...
It is my belief that the square head changes the roles and interactions of the mast and sail as the sail is now able to do more of the work. Downhaul tension is critical but the ability to vary mast stiffness less so. At least, that's my thinking, time will tell!
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JimC View Drop Down
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Posts: 6662 		Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 3:25pm
Originally posted by cad99uk

will the top of the mast be controlled with respect to depowering ?

Shouldn't really be necessary if the mast is right. It does make an argument for interchangeable topmasts though.
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cad99uk View Drop Down
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Posts: 187 		Post Options Post Options   Quote cad99uk Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 3:34pm
Peaky - thanks for that reply. I was forgetting the square head.
When do you think yours will hit the water at Chew?
 
Jim C - I was thinking how the range in crew weights will be accomodated. Perhaps different sized rigs... nah just kidding.
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MikeBz View Drop Down
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Posts: 536 		Post Options Post Options   Quote MikeBz Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 4:27pm
Get the mast & sail right and have plenty of purchase on the cunningham/downhaul.  Uppers allow you to apply prebend to flatten the sail but that also reduces the gust response, so swings & roundabouts.  B14s used to use the uppers to apply prebend, now we tend to keep them as slack as possible without losing the topmast downwind to let the right 'work' and use the downhaul to control bend & blade the head off as it breezes up.
 
Mike


Edited by MikeBz - 14 Jan 11 at 4:28pm
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 4:28pm
Should have mine at Chew in a few weeks. Probably around the time of the dinghy show. Just depends what minor changes there are to make etc.
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Post Options Post Options   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 14 Jan 11 at 4:51pm
I'll also be doing the Easter Chase at Rock and (depending on crew availability) the Exmoor Beastie in mid March.
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