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Updated: August 29, 2024
XXV. A SELF-LAUNCHING MODEL AEROPLANE. By V. E. Johnson, M.A. This article deals not with a scale model a small copy of some full-sized machine but with one designed for actual flight; with one not specially intended to create records either of length or duration, but which, although small details must perforce be omitted, does along its main lines approximate to the "real thing."
It would be quite impossible to give in the compass of this article such directions as would enable a novice to make a really efficient propeller, and it must be efficient for even a decent flight with a self-launching model. The diameter of the two propellers should be about 11-1/2 to 11-3/4 inches, with a pitch angle at the extremities of about 25 to 30 degrees as a limit.
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