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zailor View Drop Down
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Post Options Post Options   Quote zailor Quote  Post ReplyReply Direct Link To This Post Topic: Masts
    Posted: 10 May 09 at 7:02pm

This is just something that I have always pondered over and thats the stayed and unstayed masts.

What is the difference? (bar the obvious; one has those metal cable things on it!)

 

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radixon View Drop Down
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Post Options Post Options   Quote radixon Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 09 at 8:52pm
a stayed mast can be tensioned using the shrouds and the jib
You can set it to crew/helm weight etc

An unstayed mast can only be racked on kicker/main sheet

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alstorer View Drop Down
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Post Options Post Options   Quote alstorer Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 09 at 9:14pm
Stayed rigs give much more control of the mast shape and postion. Unstayed mast are usually so for ease of rigging and simplification of sailing.
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Smight at BBSC View Drop Down
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Post Options Post Options   Quote Smight at BBSC Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 09 at 9:28pm
Originally posted by alstorer

Stayed rigs give much more control of the mast shape and postion. Unstayed mast are usually so for ease of rigging and simplification of sailing.


Although an unstayed mast such as that on a finn surely makes the sailing more difficult?
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G.R.F. View Drop Down
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Post Options Post Options   Quote G.R.F. Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 09 at 10:02pm
Hmm, I thought the only logic for a stayed mast was to attach more than
one sail to it, or to trapeze from.

Personally I wouldn't go as far as to say an unstayed mast is any more or
less capable of being bent to a required shape, in fact I'd probably go further
and say in the post windsurf sail design era, the controls that can be built
into luff curve shape can do pretty much anything for any condition.

But then what do I know, I've only been around a relatively short time and
view things from perhaps a different perspective than most.

Edited by G.R.F.
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Lukepiewalker View Drop Down
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Post Options Post Options   Quote Lukepiewalker Quote  Post ReplyReply Direct Link To This Post Posted: 10 May 09 at 10:04pm
Potentially also a reduction of drag, although the beefier mast section required will add more weight compared to the stayed equivalent.
If you really want to stayed masts can be made ridiculously thin (see Star) but the attendant risks in case of rigging failure or oversight are greater. (see errrr.. Star...)
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Post Options Post Options   Quote Rockhopper Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 09 at 7:58am
The vareo has a stayed mast but the shrouds are only there to stop the mast from inverting when the kite is up going down wind.

Edited by Rockhopper
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tack'ho View Drop Down
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Post Options Post Options   Quote tack'ho Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 09 at 8:42am

Bu**er. agreeing with the grumpy one again.  The way Una masts are built now'a'days is extremely complex (laser rubbish exempting.. ). Ask the guys at tropical who built Shirleys Europe mast if they think a lack of stays equates to a lack of complexity.

An unstayed mast can only be racked on kicker/main sheet

Errr in a word NO. 



Edited by tack'ho
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m_liddell View Drop Down
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Post Options Post Options   Quote m_liddell Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 09 at 12:50pm
Originally posted by tack'ho

Bu**er. agreeing with the grumpy one again.  The way Una masts are built now'a'days is extremely complex (laser rubbish exempting.. ). Ask the guys at tropical who built Shirleys Europe mast if they think a lack of stays equates to a lack of complexity.

When you start adding jibs, traps and spinnakers (especially mast head) and bigger mains an unstayed mast just isn't an option.

For windsurf sized sails for singlehanders there no doubt that can be made to work well.

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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 11 May 09 at 1:23pm
Originally posted by m_liddell

...for singlehanders there no doubt that can be made to work well.

Made to work adequately anyway... folk keep trying them in Moths, but I don't think there's been a competitive unstayed rig since the 1960s - about the time the Europe branched off.

Its worth noting that, AIUI, a lot of the complexity and manufacturing difficulty in SRs notorious Europe mast was as a result of the need to get the bend right whilst conforming to the tight class rules on external dimensions. This meant that they couldn't add or subtract layup from the outside of the spar to meet the requirements. Consequently changes had to be made to the inside which is rather trickier to do.

Edited by JimC
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