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post #21 of 27 Old 01-17-2011
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Originally Posted by labatt View Post
We have a third reef... North of Annapolis installed it for us and it was a regular thing for them. Ours gives us 45% of the main (approximately). We use two line reefing for all three of our reefs, led back to the cockpit. We have a heavy Schaefer cheek block on the boom with oversized screws, and we said "screw weight aloft" and went with a heavy running line for the third reef. We've actually never used it (when we were in 70kts of wind a couple of years ago we reefed to our second reef and ran in front - in retrospect, a third reef would have been a smart idea as we exceeded 9kts of boatspeed on a vessel with a theoretical maximum of 7kts - and that was with very little wave action i.e. we weren't surfing down a wave). Anyway, we do like to know it's there.
Ya think???

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post #22 of 27 Old 01-17-2011
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I have 4 reefs but only have 1, 2 and 3 rigged and when I was out in 45 knots gusting 55 knots I was wishing I had it rigged as the third reef that gets me down to 30% of the main's size was too much sail.

My 4th reefs substitutes for a storm trysail but my sail is 13 oz cloth and can take the load. Off-shore I will rig reefs 2,3 and 4.


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post #23 of 27 Old 01-17-2011 Thread Starter
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Now that I am up to speed on reefing for gale force winds, can someone answer a more perplexing question?

HOW do I get this forum to send me email notifications about new posts?

As far as I can deduce, I am set up to get them, but I don't get them.
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post #24 of 27 Old 01-17-2011
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HOW do I get this forum to send me email notifications about new posts?

As far as I can deduce, I am set up to get them, but I don't get them.
Looking into it!

Ron

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post #25 of 27 Old 01-17-2011
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Wind force is sail area x speed squared. So if you reef normally at 20 by 30 you need to reduce the sail area by half. If 25 by 35. I am not sure why Sailing dog says the reefed sail will often have less force on it than the unreefed sail would have normally.
Say you normally reef at 20 knots. At 30 you need have half the area or a bit less. Comparing both wind speeds at say 5 and 10 knots less you will have less force on the reefed sail than on an unreefed sail at 20 knots but quite a bit more than at 10-15 knots. At 35 however even with a 50% reef you will have a third more than at 30.
The traditional 37.5% less luff length gives a sail area reduction of about 60% if my arithmetic is right because the foot also reduces.
I estimate that the normal second reef only extends the wind range by 6 knots or so. The advantage of a dedicated sail if you need it is that it can be much stronger, because gusts will tend to quite high and the sea state would tend to reduce the ability to handle them in the usual ways.
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post #26 of 27 Old 01-17-2011
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Again, it all depends on how deep the reefs are and what wind speeds you put the different reefs in.

Quote:
Originally Posted by chris_gee View Post
Wind force is sail area x speed squared. So if you reef normally at 20 by 30 you need to reduce the sail area by half. If 25 by 35. I am not sure why Sailing dog says the reefed sail will often have less force on it than the unreefed sail would have normally.
Say you normally reef at 20 knots. At 30 you need have half the area or a bit less. Comparing both wind speeds at say 5 and 10 knots less you will have less force on the reefed sail than on an unreefed sail at 20 knots but quite a bit more than at 10-15 knots. At 35 however even with a 50% reef you will have a third more than at 30.
The traditional 37.5% less luff length gives a sail area reduction of about 60% if my arithmetic is right because the foot also reduces.
I estimate that the normal second reef only extends the wind range by 6 knots or so. The advantage of a dedicated sail if you need it is that it can be much stronger, because gusts will tend to quite high and the sea state would tend to reduce the ability to handle them in the usual ways.

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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.

—Cpt. Mal Reynolds, Serenity (edited)

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post #27 of 27 Old 01-18-2011
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We have 3 reefs. Our set up is to have a seperate cheek block and bail for each line. we also have a seperate rope clutch for each line but a common winch on the boom to snug the reef up. the bail is (almost) under the corresponding cringle but the cheek block is set aft to provide tension.
We also have one reef for the mizzen.

We do also have a trysail track for a really teeny trysail (equivalent of a 4th reef). I'd think that we'd only use it for over 60 kts. or very high wind heaving to. - haven't had to (fortunately)

That said, I'd probably go with stays'l and reefed mizzen if I wanted to heave to in high winds.

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