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 Mainsail FReefing System from CDI		  New Topic  Topic Locked
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Initially Posted - 08/14/2008 :  19:38:36  Show Profile
I just got the Sailrite brochure and found that they sell mainsail furlers from CDI. I had never known about this product. At first glance it looks like a good alternative for people who may be physically challenged but otherwise has too many negatives about sail shape. Thoughts?

[url="http://mauriprosailing.com/Merchant2/merchant.mvc?Screen=PROD&Product_Code=CDIMRS&Category_Code=CDIRS"]CDI Mainsail Furler[/url]


We cannot direct the winds but we can adjust our sails.
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 08/14/2008 :  20:28:16  Show Profile
Interesting... Like the notion of in-boom furling better though. Lets you use battens. more natural 'reefing'.

http://www.practical-sailor.com/marine/boom-furling-systems.html
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stampeder
Master Marine Consultant

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1608 Posts
Response Posted - 08/14/2008 :  21:30:51  Show Profile
i wonder why Practical Sailor doesn't review the CDI system?

Also, I kind of like the CDI system - looks like you'd have a loose footed main.
I would seriously consider one of these systems on my next, big boat.
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piseas
Former Treasurer

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USA
2017 Posts
Response Posted - 08/14/2008 :  22:51:41  Show Profile  Visit piseas's Homepage
The CDI system interests me too. The price is considerably less than in boom. Lets keep an eye out for reviews.
Steve A
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britinusa
Web Editor

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USA
5404 Posts
Response Posted - 08/15/2008 :  07:22:34  Show Profile  Visit britinusa's Homepage
I've often wondered why there does not seem to be a sail design that causes the reefing points to coincide with the batters.

I'm also curious about how those of you that have loose footed mains reef down?

paul
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delliottg
Former Mainsheet C250 Tech Editor

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USA
4479 Posts
Response Posted - 08/15/2008 :  09:08:11  Show Profile  Visit delliottg's Homepage
Maybe I'm missing something? I scanned through the documentation and still don't understand how this thing works with battens? Maybe I didn't read close enough, but it would seem like you'd be rolling the sail up perpendicular to the battens which can't be good for them. I'd imagine it'd either not roll up, or break the battens if it did?
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JohnP
Master Marine Consultant

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1520 Posts
Response Posted - 08/15/2008 :  09:18:59  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by britinusa</i>
<br />I'm also curious about how those of you that have loose footed mains reef down?
<hr height="1" noshade id="quote"></font id="quote"></blockquote id="quote">Paul,
The fore and aft reef cringles become the new tack and clew on a reefed loose-footed main, and the folded loose foot still has no effect on sail shape or tension at the foot. The reefing ties are just there for neatness along the foot and are tied above the boom.
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JohnP
Master Marine Consultant

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1520 Posts
Response Posted - 08/15/2008 :  09:22:47  Show Profile
Maybe the CDI mainsail furler requires a new sail with vertical battens!
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Nautiduck
Master Marine Consultant

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USA
3704 Posts
Response Posted - 08/15/2008 :  10:24:43  Show Profile
There are no battens used on this system (or in-mast systems). That is one of the sail shape issues. The PS article says that sail manufacturers estimate a performance loss of 20% when the main has no battens and the smaller roach that is part of an in-mast or the CDI system. The PS article only covered in-boom systems which, it seems, can have battens. Yet, the cost of those in-boom systems is quite high whereas the CDI is about $1300.
Edited by - Nautiduck on 08/15/2008 10:29:38
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 08/15/2008 :  10:42:53  Show Profile
"There are no battens used on this system . "

Indeed... and that's one of the 'game killers' for in-mast furling.

They also suffer from the same performance loss problems when the sail is partially furled... the 'draft' portion of the sail disappears onto the furler leaving behind a fairly ineffective piece of cloth.

IMHO: Raising and lowering the main on a C25 isn't that much of a chore... well, not a $1300 chore anyway.
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JohnP
Master Marine Consultant

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1520 Posts
Response Posted - 08/15/2008 :  10:57:41  Show Profile
If I had a Tartan 44, then I might want a power-assisted hoisting system, but I agree with Clam that it's just too easy on my C-25.

Here's a video showing you [url="www.youtube.com/watch?v=o0Jm6SojsVA"]how I would hoist the main [/url] on my BIG boat.
Edited by - JohnP on 08/15/2008 11:00:27
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aeckhart
Master Marine Consultant

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USA
1709 Posts
Response Posted - 08/15/2008 :  11:28:58  Show Profile  Visit aeckhart's Homepage
For those who opt to buy one of these furlers, Doyle Sails makes a main with vertical battens. I suppose they would add them to your existing main also, though I don't know this for a fact.

Frankly, reefing my main is no chore at all, even single handed. Raising and lowering is a mute point.

I'm more interested in CDI's asymetric spinnaker furler which also runs around $1300. That's an innovation a single-hander could really use.
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