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    Trying To Work With an Older Sunfish

    I just loosened a couple screws on the side opposite the spring and slipped a piece of nylon twine through and tied a loop.
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    3D Printed Mainsheet Hanger

    Even a part at 50% infill is only about 25% stronger than one at 25%, and generally only in compression.
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    3D Printed Mainsheet Hanger

    The rope loops are almost solid by design, no matter what infill you use. The section for attachment to the spar used cross infill to increase flexibility. Going to 100% solid wouldn't really provide any necessary strength, and almost doubles print time... unless you're planning on using them...
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    3D Printed Mainsheet Hanger

    Printing orientation was like the far right in photo. Sliced in Cura, printed on Ultimaker 3 extended. 0.15mm resolution 20% infill, Cross infill pattern Support on, line type support, 10% support infill Mine are printed in PLA, which won't hold up long term due to UV/moisture degradation...
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    3D Printed Mainsheet Hanger

    Went through a few different iterations before coming up with these: Feel free to 3D print your own - https://www.tinkercad.com/things/eKaoziQ5CJy?sharecode=48mEyepkg5dYjIK6pcmqfP_h4HTakUq-BaNgdkCZbb0
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    Drain plugs?

    It's an extra .10 if you have a local hardware store with a good selection of O-rings sold in singles... free if you have an O-ring sitting around like I did. ...but you're probably looking at $5-$10 if you have to order it.
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    Drain plugs?

    Yes... The thing is - even without the O-ring you could submerge the drain and water will come through the bolt threads at about an ounce every few hours. Under normal sailing conditions - the O-ring does basically nothing, because the bolt by itself will stop 99.99% of the water.
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    Sunfish Cover

    Couple loops on the underside of your fiberglass piece at the front & rear of the cokpit. Bungies tied to the loops with hooks/clips on the other end. Clip the hook/clips to hiking strap attachment points.
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    Drain plugs?

    I did also... but I have no idea what the o-ring is, and I don't think it's all that necessary.
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    Drain plugs?

    I have 1" - but either would work. I just got 1" because I found a 20 pack on eBay for a couple dollars.
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    Drain plugs?

    The thread is 1/2"-13tpi. I use a 1/2"-13 x 1" nylon hex bolt. I have a bunch extra and would offer to ship you one, but shipping would cost more than you could just buy one for. https://www.zoro.com/zoro-select-12-13-not-graded-hex-head-cap-screw-nylon-5-pk-350013100/i/G1554122/
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    Sunfish Cover

    While I personally hate tarps because they are a pain and don't work all that well, so I don't use them as boat covers... I can get 8'x16' tarps for $10. $200 is 20 tarps. 40 years at a couple years each... and that ignores the future value of money.
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    Rudder

    The De Persia bailer plug is 7/8" - 14 UNF. If trying to us a PVC plug - you would go with 1/2". 7/8"-14 has a major diameter of 0.875" 1/2" NPT has a major diameter 0f 0.84" - and it's tapered, so it should work. Another option (if you can find any) are SAE O-Ring port caps. RPO-110...
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    Need some specs for the rudder pin.

    It has a tendency to run really nasty stringers on a lathe instead of nicely breaking chips also.
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    Best NACA foil for daggerboard?

    @Ticktack If I were going to make a foil shape board by hand (or re-shape one) this is probably how I would actually do it - https://www.duckworksmagazine.com/09/howto/foils/index.htm
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    Best NACA foil for daggerboard?

    @nickzup Yep... you caught me. That PSU is still sitting out in the wind tunnel building.
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    Best NACA foil for daggerboard?

    3D print a negative half section about an inch wide and use it as a template. Here is a quick thrown together negative half of a NACA 0009 if you have access to a 3D printer: https://www.tinkercad.com/things/0G5eBQe066X?sharecode=a5qiQ4O6kGaRVbb1OZGk0XzKEJGmn6qaGVvJEsjefpY
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    Best NACA foil for daggerboard?

    http://airfoiltools.com/plotter/index?airfoil=n0009sm-il
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    Best NACA foil for daggerboard?

    If not identical - it's pretty close.
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    Best NACA foil for daggerboard?

    You'll want a symmetric foil so... a common one for this would be a NACA 0012. Problem is - a NACA 0012 is too wide at a 9.5" chord to fit in the daggerboard slot. A NACA 0009 will fit, or a NACA 0012 with the thickness chopped down 27/32"
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