Third Annual Edition, in spite of the fact that model meets are cancelled until after the war, for model planes have gone to war. They are used for recognition courses, civilian and military; they are used for identification purposes; they are used for experimental work on design, for checks on flight times and controls. It has become far more than a hobby, and goes on despite the lack of materials, -- balsa wood, rubber and engines. The accent of the book is on how-to-build.