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Step 9Prepare the struts and center disks
The wings will be attached to the center axis (the allthread bar) using two circles of plywood and struts that connect these to the tops and bottoms of the wings.
Cut two 8 inch circles of half inch plywood. Using a full-circle protractor (I downloaded one from
http://upload.wikimedia.org/wikipedia/en/thumb/0/0f/Protractor1.svg/531px-Protractor1.svg.png
), I marked lines on each circle that were 120 degrees apart. These will be the lines that the struts follow out to the wings.
drill a hole in the center of each of the circles. This hole will be the same diameter as the allthread bar.
For struts that connect the circles to the wings, you have a variety of choices. The easiest might be to simply to make these out of wood. I chose to use wood for the bottom struts (because i wasn't sure that the metal strap that I bought would support the weight. For the top I bought a 4 foot piece of zinc plated metal that had holes punched in it along the center line of the strip of metal.
I cut the struts to 11 inches in length. Then I placed the end of each strut 1 inch from the center of the circle along one of the 120 degree lines. I drilled two holes in the strut and one through the circle of plywood. I bolted these firmly in place.
About one inch from the other end of the strut I drilled a hole the same diameter of the hole in the end piece.
Cut two 8 inch circles of half inch plywood. Using a full-circle protractor (I downloaded one from
http://upload.wikimedia.org/wikipedia/en/thumb/0/0f/Protractor1.svg/531px-Protractor1.svg.png
), I marked lines on each circle that were 120 degrees apart. These will be the lines that the struts follow out to the wings.
drill a hole in the center of each of the circles. This hole will be the same diameter as the allthread bar.
For struts that connect the circles to the wings, you have a variety of choices. The easiest might be to simply to make these out of wood. I chose to use wood for the bottom struts (because i wasn't sure that the metal strap that I bought would support the weight. For the top I bought a 4 foot piece of zinc plated metal that had holes punched in it along the center line of the strip of metal.
I cut the struts to 11 inches in length. Then I placed the end of each strut 1 inch from the center of the circle along one of the 120 degree lines. I drilled two holes in the strut and one through the circle of plywood. I bolted these firmly in place.
About one inch from the other end of the strut I drilled a hole the same diameter of the hole in the end piece.
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