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Old 10-10-2010, 06:37   #16
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Here is a picture of the mainsail on our catamaran showing a full roach. The line is a spare halyard connecting the clew to the headboard, so it would represent the normal no roach triangle.

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Old 10-10-2010, 06:38   #17
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Could a “full” roach be one large enough to require full battens?
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Old 10-10-2010, 07:31   #18
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Originally Posted by GordMay View Post
Could a “full” roach be one large enough to require full battens?
I thought so too, Gord. But when I had my new main made I wanted short battens as the full length ones are a pain. But I also wanted a larger roach (and deeper 2nd reef). The sailmaker said fine and cut a roack that just swishes the twin backstays! yet its fine in light air with the short battens.

I do note this post is in the multihull forum and theirs can be even larger of roach as they dont have backstays. Its about keeping the center of effort low, I believe.


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Old 10-10-2010, 07:43   #19
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The principal advantage is getting more sail area up high where there is considerably more pressure. Or more sail area without a taller stick.

The downside is greatly increased pressure on the battens, which necessitates their usually having fancy ball bearing cars and tension adjusters. And much greater leech tension for the mainsheet and vang to deal with.

Full battens often need crew help to clear the backstay and then in light breezes the battens will not flip, but remain inverted .... unless crew goes up the mast and adjusts them ... they're very cool.
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Old 10-10-2010, 18:43   #20
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In the event of a squall how many reefs do you put in the roach?
That depends on how strong the puffs are.
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