Modified Canary

Note from Charles Young who is making model planes in Schools:

The design for Don Ross’ Canary is given in his book “Rubber Powered Model Airplanes”, BUT he provided me with the design for a pylon that holds the wing at the proper incidence and provides a bit of stability (because it raises the wing up above the motor stick).

This photo shows my slight modification of Don Ross’ pylon for the Canary. The dimensions of 1/16 the balsa sheet are about one inch by two inches (the wing width). Note the direction of grain in the balsa sheet. The balsa sticks are about 1/8 inch square, and they are both about 1/8 inch longer than the balsa sheet. I made the square balsa stick that attaches to the wing longer so that it may be clamped with a rubber band for gluing. Note that the two square balsa sticks are not quite parallel. The sticks should have about 1/16 inch greater spacing at the front of the wing. This gives the wing a bit of incidence and makes the airplane fly better.

I found that the 7th graders had difficulty fastening the glue joints with pins, so I devised ways to do the fastening with rubber bands, as shown here.

This photo shows the method of clamping the pylon to the wing with a rubber band while the glue cures.

I realized that I could clamp the stabilizer joints with rubber bands if I just shifted the
stabilizers a bit forward. These two photos show the method of clamping the horizontal and vertical stabilizers with rubber bands for the glue to cure. With a bit of care, it is possible to clamp both stabilizers at one time with two rubber bands.

After years of working with glue joints for other woodworking projects using pine and hardwoods, I tend to believe that a good glue joint is a clamped glue joint. But when working with balsa, I found that even a clothespin used as a clamp will tend to crush balsa.
So, I devised the clamp shown in the photo. They can be made from balsa, but these are made from “popsicle sticks” found at a craft store. You put in a bigger or smaller spacer as needed. I use the smallest rubber bands I found at an office supply store. You can start a project by making as many of these clamps as you think you need.