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Thread: 4:1 internal outhaul

  1. #1
    Join Date
    May 2008
    Location
    Excelsior, Minnesota
    Posts
    326

    4:1 internal outhaul

    It’s a rainy day so I decided to take on a project that’s been bugging me since I got the boat last year and thought I’d spend a few minutes documenting it for the forum.
    Outhaul control is critical to maintaining proper sail shape at different points of sail and in varying conditions. The original external set up on the Commander is woefully inadequate.
    There are many great ways to rig an outhaul, but this is my favorite. I cut the hole for my exit block on the clew end as far aft as possible. On the control end I cut it within a long needle nose plier’s length to the bail for the vang. This allows me to use the through bolt for the vang bail as my anchoring point for the two separate lines as well as keeping the control end within reach when the boom is out off the wind. First I lay out the system out outside the boom to get the line lengths (Pic #2) then splice in eyes on the anchored ends, though a loop tied with a bowline would be fine. Then I pull the two ends to be anchored as well as the bitter end through the exit block hole. Cut a piece of tubing the width of the boom to sleeve the vang through bolt and protect the eyes from the threads. Put the tubing through the eyes and tape them so its easier to keep everything together. Grab the tube and lines with your long needle nose and spend a few frustrating minutes trying to line it up and mount your vang bail. Thread your control end through the exit block and mount the block and jam cleat. On the clew end I attach a bungee to the block along with the tack line and anchor the other end to a small padeye inside the boom. The bungee keeps tension on the system when its slackened to help keep the blocks and lines from tangling and works like a power assist to help loosen the foot when you slack the outhaul.
    I used 7/64” spectra for the clew line and 3/16” Trophy braid for the control line.
    Attached Images        
    Last edited by Commander227; 06-10-2009 at 07:55 PM.

  2. #2
    Join Date
    Sep 2008
    Location
    Brooksville, FL
    Posts
    720

    I like it Mike

    I increases purchase on the outhaul for those times when the winds pick up and you need to flatten. It is inside the boom and because of it it is out of the way. And it is easy to reach when the boom is out for down wind sailing. Pretty much solves all the issues. Very nice.

    So what is the final purchase you obtain with the cascading blocks? is it 4:1 or 6:1?

  3. #3
    Join Date
    May 2008
    Location
    Excelsior, Minnesota
    Posts
    326
    Quote Originally Posted by Commander 147 View Post
    So what is the final purchase you obtain with the cascading blocks? is it 4:1 or 6:1?
    4:1, although an argument could be made that its 5:1 because you're pulling the control end in the direction of advantage after the exit block.

  4. #4
    Join Date
    Sep 2008
    Location
    Brooksville, FL
    Posts
    720

    Another argument could be made that it is 7:1

    including the clew attachment because of the cascading blocks "A" and "B" in this picture function similar to the boom vang arrangement that I use in the second picture.
    Attached Images    

  5. #5
    Join Date
    Oct 2009
    Location
    New Orleans metro area
    Posts
    30
    I am very impressed with this system for internalizing the outhaul. I am in the planning phase of upgrading mine. I would like to know how this system has fared over the years and whether any changes are advised.
    Thank you
    Marcelo
    A-407
    Ad Astra

  6. #6
    Join Date
    May 2008
    Location
    Excelsior, Minnesota
    Posts
    326
    I've used this system on many boats, still my favorite.
    Mike
    C227

  7. #7
    Join Date
    Oct 2009
    Location
    New Orleans metro area
    Posts
    30
    Good,
    I am glad it has withstood the test of time.
    Marcelo

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