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Frank Hopper
Past Commodore

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Pitcairn Island
6776 Posts
Response Posted - 12/12/2006 :  06:30:25  Show Profile  Visit Frank Hopper's Homepage
A couple of things,
Nadi, I believe your purchase is 2:1 not 4:1. The port block is dead and only reroutes the two "free" lines, it does not add to the MA. Also, in my design I have all of the control of a traveler, in this design you will need a 6 or 8:1 boom vang in order to play it and control the leech tension. My concern about the multiple bails is the ingress and egress from the cabin, it seems it would create a bit of a cat's cradle over one's head.
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takokichi
Captain

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USA
321 Posts
Response Posted - 12/12/2006 :  09:30:09  Show Profile
By sleeve I mean run a tube with an outside diameter equal to the inside diameter of the boom up inside the boom.
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ilnadi
Captain

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452 Posts
Response Posted - 12/12/2006 :  11:31:45  Show Profile
Frank, I am still thinking it is 4:1. Imagine the two "down" blocks together in the middle, then you'd have a classic 4:1. It kinda does not work when the boom is between the two anchors, but then again it would be pretty hard to center the boom with this arrangement without adding a lot of down pull on the boom, which leads to Justin's point. Even at 4:1, my math says what used to be 10lbs of pull on the end-boom 5:1 will become (let's see 10 x 2 x 5/4) 25 lbs, time to buy gloves. BTW, we already have a 6:1 vang. And I suppose you can make the main 6:1 without adding another bail. As far as the strangling cat's cradle, I hope to have a small dodger for the companionway, which should deflect the mainsheet.

Justin, that's what I was afraid you were going to say. I can't right now imagine finding an oval extrusion that fits inside the boom, removing all screws and pop-rivets and adding that. I wonder if an I-beam to spread the load would have the same effect.
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takokichi
Captain

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USA
321 Posts
Response Posted - 12/14/2006 :  16:35:49  Show Profile
I have not done engineering studies of the extrusion, but a u-shaped sleeve on the outside might work, too. It also might depend on how hard you sheet the thing. We were racing the boat and had it on its ear a lot - raced double handed most of the time. We found that conventional wisdom not withstanding powered up dinghy style was fast. If you're not going to be racing in that mode, it may not matter as much.

YMMV...
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Sryth
Deckhand

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USA
22 Posts
Response Posted - 09/13/2008 :  11:21:38  Show Profile
I hate to bring up an old thread, but this came up in my research and this is exactly what I wanted to do...did you ever get it done Frank?
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pastmember
Master Marine Consultant

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2402 Posts
Response Posted - 09/13/2008 :  14:49:09  Show Profile
nope
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skrenz
Captain

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USA
351 Posts
Response Posted - 09/19/2008 :  19:10:42  Show Profile
When I bought my 78 Catalina 25 a PO had moved the traveler to mid boom and installed a Harken traveler across the seats right in front of the hatch way. I'm with Frank on this one. I think this location makes no sense at all. But others disagree. It seems to me that the problem with the stock traveler is that its too short and doesn't really do anything. So what I did was relocate this Harken traveler to the transom and put the main sheet to the back of the boom again. Now I have a traveler that has some real usable length and functions as a traveler should. This was a difficult install because there is just enough room to fit it into place between the pushpit stantion and the inner edge of the transom. I also needed to curve the straight track to conform to the curve of the transom. But this wasn't that difficult to accomplish. If I could figure out how to post pictures to the site I could show you the outcome.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.