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    Sail Servo Arm - How I build them....
    by Joe727 πŸ‡ΊπŸ‡Έ ( Commander)
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    2 Posts 6 Comments 0 Photos 9 Likes
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    πŸ“ Additional photos
    24 days ago by Joe727 ( Commander)
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    Some additional photos of the process taken while building the sail arm for my US1Meter boat.
    Joe😎
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    πŸ“ Sail Servo Arm - How I build them....
    1 month ago by Joe727 ( Commander)
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    Sail Servo Arms are subjected to a great deal of stress and torque, particularly when handling 1,000 sq. inches of sail. The servos I use generate about 275 oz.in. of torque. (20kg.cm.), so a strong arm is necessary. There are commercially available arms that are typically plastic or aluminum, but I prefer to build my own out of carbon fiber 2.5mm sheet. I like to build everything anyways!

    Starts out as with all of my designs, I sketch options and then creative final drawing to full size in graph paper. To transfer this design to the carbon sheet, I use some masking tape and cover an area of the cf sheet. Then I redraw on the masking tape with a thin sharpie. Then I cut out the arm on my bandsaw while wearing safety glasses and a mask. The carbon fiber dust and slivers are nasty, don't want to breath at all. Still trying to dig a sliver out of my finger so you might consider gloves as well.

    I recently found this nice aluminum servo hub which is low profile and has threaded holes - see photo for brand. The hub is secured with four screws and seem to be adequately strong.

    The eyelets that the sail sheets (lines) will pass through need to be smooth to avoid snags and will have to take a lot of wear. I use glass rings that are used in fishing pole guides. I buy the replacement tip kit, see photos. Using a rotary tool with an abrasive wheel I gently cut through the metal ring holding the glass ring, it will just pop out.

    Finished arm shows the pressed in glass eyelets and hub mounted. Then, finally shown mocked up in a current build.

    Please ask any questions that you may have as this is a pretty brief post. πŸ˜‰

    Joe 😎
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    πŸ’¬ Re: Sail Servo Arm - How I build them....
    1 month ago by Martin555 ( Fleet Admiral)
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    Hi Joe.

    There is more to making this sail arm than you think.

    Really good work.

    Martin555.
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    πŸ’¬ Re: Sail Servo Arm - How I build them....
    1 month ago by MouldBuilder ( Commodore)
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    Nicely done Joe.
    I recently read in the instructions of a saw I bought, to be extremely careful when cutting carbon fiber due to the risk of electrocution. I had never thought of this risk before but I suppose it makes sense.
    Take care.
    Peter.πŸ‘
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    πŸ’¬ Re: Sail Servo Arm - How I build them....
    1 month ago by Ron ( Commander)
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    Well written explanation of how to make the servo arm. Good photos. I saw that the Jib arm is shorter than the Main. I had not that of that on ones I have made, but it makes since!

    Ron
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    πŸ’¬ Re: Sail Servo Arm - How I build them....
    1 month ago by Joe727 ( Commander)
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    Martin,
    Thanks for the comment. I've built quite a few of these over the years, this one really went fast.
    It's for my Sailing Barge that is in progress.

    I am making another one today, one for my US1Meter build. Stay safe.
    Joe 😎
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    πŸ’¬ Re: Sail Servo Arm - How I build them....
    1 month ago by Joe727 ( Commander)
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    Peter,
    Wow, electrocution!

    I was about to head out to the shop to build another but I will look this issue up first. Thanks for the heads up.
    Joe 😎
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    πŸ’¬ Re: Sail Servo Arm - How I build them....
    1 month ago by Joe727 ( Commander)
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    Ron,
    Each boat type has it's own design in terms of the hole spacing / arm length. I will try to explain it with some sketches when I can. Easy to do but hard to explain. Coming soon.....β›΅
    Joe 😎
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