I designed John's Shoestring approximately 3 1/2 years ago. It has about 650 squares and the target weight was to be close the 70 ounce range. The idea was to design and build a plane the way a stunt person would. I have been a co-judge at the NW Regionals and am dismayed how many scale modelers must use oak and Bondo. My fellow judge Mark Scarborough have been wondering why these planes are such loafs. When I designed the Shoestring, the goal was to keep it light. Mission accomplished! John says it is a breeze to fly.
The latest Scale design is a Little Tony/Cosmic Wind which John has finished. This one is the same wing area and same weight as the Shoestring. Guess how it will fly?
Bottom line if you are designing a scale plane, design all the parts to where you will think they are too lightly built. You will probably be wrong. The good thing is that lighter parts demand less structural support in the other components, lighter landing gear, lighter engines, etc, etc, etc. It ends up snowballing to where you end up with a feather. Remember, feathers fly, bricks don't.
Another thing as long as I am on a roll. To overbuild something because you want it to survive a crash is the wrong attitude and becomes the worst possible way to create a scale plane. Then all the components get overbuilt and the end product is a brick which becomes a self fulling prophecy. Think light and feathers rarely crash.
Pat Johnston
Scale Design Technology
Skunk Works