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First I needed a way to hook up the rod. Since epoxy wont stick to the servo hub, I decided to make a little "casting" setup. First I soldered up a series of concentric brass tubing pieces that would take in the servo hub diameter on one end and slide over my 1/8 inch pushrod (twistrod?) on the other. |
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| I put a thin blanket of modelling clay over the servo and used a regular control horn to clean up the tines of the servo hub. I also put a tiny square of tape over the screw hole to keep resin from getting in there. |
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| Then I filled it all full of 2hr epoxy resin and waited the full 24 hours for maximum hardness. A that point, the new piece can be removed and the clay picked out. It now has the exact imprint of the servo hub tines, and can be removed and replaced repeatedly. If you really want to get fancy, you could figure out a way to allow the screw to still be used, but I don't think it's necessary for my application. |
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I'll work backwards on the installation of the necessary arms and yoke. The aft of the boat is to the right, the bow toward the left. The twistrod is at the top left coming out of the cap and the yoke is on a transverse support rod which is glued to the sides of the hull. Notice the two ends of the yoke must be offset or they will hit each other. |
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| I cut a couple of pieces of brass, then drilled them and soldered them together with a length of tube. Then I bent one of the pieces twice to create the offset and drilled little holes along the edges. |
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| Here's another shot. |
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| Here is how it will sit in the boat, with the same orientation as the first picture. You need to work through your part sizing in a specific order. First make the transverse support rod the right length so the yoke doesn't hit the bottom of the boat. Then make your vertical pushrod so that the horizontal leg of the yoke is horizontal when the pushrod is square with the twistrod. Then make your horizontal pushrod back to the planes the right length. Last thing is a drop of CA on the twistrod, after you've fired up the radio and made sure the servo is zeroed out. Then you can adjust your travel with pushrod connections. |
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I will post more as I have time to work on the project. Thanks, --Jason Overhulser |
