Chez Coupe (oz12980)
About this Plan
Chez Coupe. Rubber duration model.
Quote: "The Chez Coupe, by Ron Roberti. Select a nice, straight pool cue and build yourself a couple of compact competitive coupes for the coming contests.
After building and flying Unlimited Rubber for many years with good success, I was talked into trying Wakefield by a good Wakefield flyer and a good friend, Bob Loeffler. Well, to my own amazement, I loved it and managed to make it to the finals in my first year, 1976. After that, Bob talked me into building an 80 gram Coupe. I did, and the results astounded him, and me. I really didn't believe an airplane could fly so well on 10 grams of rubber. An excellent climbing and gliding Coupe for the contest flyer, you will really have a ball with it. Let's get to work on Chez Coupe.
THE FUSELAGE: The fuselage is made by rolling a sheet of 1/32 med hard straight grain balsa around a 1 inch form. To make the tube, wrap a piece of tissue one complete wrap around the form. Lay the sheet wood, that has been soaked in water, as close to the edge of the form as possible, making sure it lines up perfectly straight. Roll the wood around the form. Tape the tissue to the form so it does not unroll and bake in a low temperature oven for 30 minutes. When completed, remove the motor tube from the form and cement the seam. Make sure the seam is perfectly straight so that the tube doesn't bow. Use care here because any bend in the tube will render it useless. When this is dry, sand the excess glue from the seam and give it three coats of nitrate dope, sanding lightly between coats.
Now you can roll a piece of 1/16 x 1/2 around the same form used for the motor tube, to form a doubler for the nose section. See plans. Use the same procedure as used on the motor tube. Fit this piece inside the motor tube at the front end and cement in place. You'll have to trim it a little so it will fit snug inside. You can use Sig celastic for this also. I use it and find it easier and stronger than balsa. Your choice.
Now cut a disk of 1/4 inch hard balsa to fit inside the front end doubler so that it fits snug inside. This will be used on the prop assembly and as a nose block stop. Cut a small piece from the circle and cement to the nose section doubler. This is the nose block stop. The remaining piece will be used on the nose block and prop assembly later. Use epoxy here. When this is completed, sand the nose section face for 2° down thrust and 2° right thrust. Cut a 1/8 balsa disk for rear and cement as shown on plans.
Tissue cover the motor tube by cutting 1/2 inch strips of tissue, spiral wrap around the motor tube, and dope. Repeat this procedure twice to get a double tissue covering that's very strong but not heavy. When this is completed, three coats of nitrate dope thinned to 50-50 should be enough. Set the motor tube aside for now and we'll build the tail boom.
The tail boom is bent the same way as the motor tube, except that the tail boom is tapered. Use very light 1/32 sheet and wrap it around a pool cue stick to form the taper. A good straight pool cue stick can be bought for about $5 in better sporting goods stores. It's a good investment, as you will use it over and over when building other airplanes. Follow the exact procedures as for the motor tube, and you won't have any trouble. Cut one balsa circle of 3/32 scrap and insert in the rear..."
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