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The 1⁄8-inch wire main gear strut (at left) is attached to the ply support in the bottom fuselage with nylon gear clips. The gear fairings are made of 1⁄4-inch balsa. The windscreen (above center) is made from manila folder card and has a piece of 1⁄8 × 1⁄4-inch balsa glued to the back centerline for rigidity. The completed model (above right) ready for painting and detailing. One advantage of cardboard construction is that it results in solid surfaces with no covering required.

glued down the back centerline for support. Cover the front face of W1 and W2 with alu- minum MonoKote and outline with a black stripe to simulate the windscreen. Glue W2 to the aft cockpit at this time. W1 will be glued in place after the wing is attached to the fuselage. Bend the tail wheel strut from 3⁄32-inch

wire as shown, place on the ply support, wrap with nylon thread, smear with glue and glue in the bottom aft fuselage cutout. Make the main gear from a piece of 1⁄8-inch diameter wire as shown. Attach the main gear using nylon gear clips to the ply mount- ing plate in the bottom fuselage. The ta- pered gear fairings are made from 1⁄4-inch balsa sheet sanded to a streamlined cross- section. Cut a 1⁄8-inch deep groove down the middle of the fairing and glue over the main gear wire. Glue the horizontal stabilizer to the fuse-

lage. Glue the rudder to the fin with the trailing edge offset 1⁄2 inch to the outside of the flying circle and glue the assembly in

1⁄2-inch balsa rounded off to a streamline shape. They can be painted white and set aside and installed after the rest of the mod- el is painted and detailed. Cut holes in the wing and fuselage to accept the struts, then glue the wing to the fuselage. Now glue the front windscreen W1 in place. Note that it glues to the leading edge of the wing as well as to the fuselage.

place. Add carved balsa fairings above and below the horizontal stabilizer root to com- plete the aft fuselage. The wing/fuselage struts are made of 1⁄4 ×

Finishing and final assembly Apply a coat of sanding sealer to all the

balsa parts of the model and sand smooth. Give the cardboard sections two coats of clear dope, sanding lightly after each coat with #400 sandpaper. Then follow with two coats of color. The color scheme I used for my model is white with bright red trim and Army insignia. Windows are aluminum MonoKote outlined in black. Roundels were

printed on Avery large stick-on labels (#8165). Insert the strut into the wing cutout and

then slide them into the cutout in the fuse- lage side and glue in place. These cutout lo- cations are shown on the wing and fuselage drawings. Pass the leadout wires through the wing tip line guide and tie off. Attach the nylon control horn to the elevator and hook up the pushrod. Attach 21⁄2-inch diameter wheels to the main gear and a 1-inch diam- eter wheel to the tail gear. Add a 9–6 prop to the engine and your ship will be complete. Be sure to balance the model at the point shown on the plans. If you have any comments, suggestions or questions concerning the cardboard Bird Dog, please write to me at the following ad- dress: Chuck Felton, 825 Lake Park Drive, Lakehills, TX 78063. Or e-mail me, maybe with a photo of your completed cardboard model, at You can also visit my website at http://www. to see more card- board designs and building techniques.

The forward and aft windscreens (above left) are manila folder cardboard covered with aluminum MonoKote and outlined in black. A view of the underside (at left) showing the engine cutout, main landing gear attach and wing/fuselage struts. The L-19 (above) has a wingspan of 60 inches and a length of 42 inches. Its size and wing loading of 16.5 ounces/square foot make it a very steady sport flying model. The bottom of the airfoil is flat with a curved upper surface.


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