I am wanting to add a purchase to my starboard and port jib sheets so that the the standard cabin top winches do not have to be used. I am looking for suggestion on the purchase ratio and if anyone has had success or failures with this type of modification.
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Justin - O'day Owners' Web
I would think it would be a pain to tack
Carl - Even with the Hunter rig's relatively small headsails, I suspect there are times when you are grinding fairly hard on the sheet winches. Even if not, remember that you have a significant purchase ratio with the winch, and so you will probably need a similarly significant purchase ratio to be able to hand sheet with the same effort. To me, the amount of line you would need to pull would be too much, especially in short tacking situations. I guess you could rely on the main in those situations, but I wouldn't want to have to. Let us know if you find a system that proves me wrong. Justin - O'day Owners' Web
Carl - Even with the Hunter rig's relatively small headsails, I suspect there are times when you are grinding fairly hard on the sheet winches. Even if not, remember that you have a significant purchase ratio with the winch, and so you will probably need a similarly significant purchase ratio to be able to hand sheet with the same effort. To me, the amount of line you would need to pull would be too much, especially in short tacking situations. I guess you could rely on the main in those situations, but I wouldn't want to have to. Let us know if you find a system that proves me wrong. Justin - O'day Owners' Web
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Been There
Here's where to ask the question
A #20 winch gives 20:1 purchase, with a standard handle. I suspect you need less purchase for pulling a rope than for winching it. Winching is awkward. The human body is more adept at pulling. But I'm no expert. You should ask your question on Brion Toss's bulletin board: http://www.briontoss.com/wwwboard/wwwboard.html
A #20 winch gives 20:1 purchase, with a standard handle. I suspect you need less purchase for pulling a rope than for winching it. Winching is awkward. The human body is more adept at pulling. But I'm no expert. You should ask your question on Brion Toss's bulletin board: http://www.briontoss.com/wwwboard/wwwboard.html
Carl, maybe you are looking for
a self tending jib. With a self tending jib you can set it and forget it (unless adjustments are required). We use a Camber Spar that is acutally in a pocket that is built into the jib sail. The major down side of this arrangement is that you only have a 90-95% jib. This is not a big deal with your type of rig. The spar has a block on the end of it with another block that is mounted on the deck just in front of the mast. When you turn the boat the jib acts similar to the main. Let me know if you want additional information.
a self tending jib. With a self tending jib you can set it and forget it (unless adjustments are required). We use a Camber Spar that is acutally in a pocket that is built into the jib sail. The major down side of this arrangement is that you only have a 90-95% jib. This is not a big deal with your type of rig. The spar has a block on the end of it with another block that is mounted on the deck just in front of the mast. When you turn the boat the jib acts similar to the main. Let me know if you want additional information.
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Miles
Hey Steve
How does the Camber Spar work with roller furling? It sounds like maybe it's like a jib boom? I'd love to add a self tacking headsail to my 340, setting the auto pilot and running around the wheel to the coachroof gets old. I guess that's what crew is for when they're not busy sunning themselves ???
How does the Camber Spar work with roller furling? It sounds like maybe it's like a jib boom? I'd love to add a self tacking headsail to my 340, setting the auto pilot and running around the wheel to the coachroof gets old. I guess that's what crew is for when they're not busy sunning themselves ???
Miles and Miles.
Miles: No it does not work with a roller. It has a stainless steel spar that has a built in curve when you tack the curve flops over to the opposite side within the pocket inside of the sail. It is one of the disadvantages of the setup. I am planning on upgrading our jib in the next year or so and plan on going to a roll furling jib. What we are looking at is doing something that will allow us to sail with a 90% self tending setup when we are in close quarters or high winds and then have the ability to unfurl the jib to 110-130% in lighter air. When the jib is unfurled you would no longer have a self tending setup. Harken has a setup for this arrangement on their website.
Miles: No it does not work with a roller. It has a stainless steel spar that has a built in curve when you tack the curve flops over to the opposite side within the pocket inside of the sail. It is one of the disadvantages of the setup. I am planning on upgrading our jib in the next year or so and plan on going to a roll furling jib. What we are looking at is doing something that will allow us to sail with a 90% self tending setup when we are in close quarters or high winds and then have the ability to unfurl the jib to 110-130% in lighter air. When the jib is unfurled you would no longer have a self tending setup. Harken has a setup for this arrangement on their website.
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Joe
My opinion....
...is try another solution. With so much more line and blocks attached to the sail, it's likely you'd have trouble getting it across in light air, not to mention its hanging up in the rigging or the tons of line in the cockpit. On my Nacra 5.2 (17 foot catamaran) there is a jibsheet purchase system, the sheet is a 42 ft. continous single line with a very small distance to travel. If it is not practical to relocate the primary winches further aft, nearer the helm, I would investigate a self-tending system.
...is try another solution. With so much more line and blocks attached to the sail, it's likely you'd have trouble getting it across in light air, not to mention its hanging up in the rigging or the tons of line in the cockpit. On my Nacra 5.2 (17 foot catamaran) there is a jibsheet purchase system, the sheet is a 42 ft. continous single line with a very small distance to travel. If it is not practical to relocate the primary winches further aft, nearer the helm, I would investigate a self-tending system.
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Bill Colombo
Winches or Purchase
Carl,You might be able to get away with a 2:1 purchase with 2 blocks attached to the clew of the jib, but I doubt that it will give you enough power for heavy air. This system is used on Melges 24's and works well but the jib on that boat is quite a bit smaller. Bill Colombo, Doyle SF
Carl,You might be able to get away with a 2:1 purchase with 2 blocks attached to the clew of the jib, but I doubt that it will give you enough power for heavy air. This system is used on Melges 24's and works well but the jib on that boat is quite a bit smaller. Bill Colombo, Doyle SF
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