CHAPTER XV.
MODEL AEROPLANES.
Self-propelling air devices must be of the lightest possible weight and yet they must have strength. There will be no attempt to give a great variety of model aeroplanes; but a few can be discussed, perhaps three or four. The first is a little practice model that has been of great service to me, both for study and for instruction to others. It is small and will not fly far. I can wind it up and turn it loose in a schoolroom. It hits rather hard sometimes but nothing has happened to it beyond a broken propeller, and the rubber bands that are used to tie the planes to the spine have been broken.
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Fig. 220.
In Fig. 220 the model is shown in two views, the plan and side elevation. The planes are made of 116″ birch veneer, but other woods, will do. The small fore plane is bent at quite a sharp angle and was
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