Chicago Aeronuts Bulletin Vol. IV No. 1 (Sept. 1939)
Contains an article on rubber motors, “MATH FOR DURATION OF MODELS”, by Raoul J. Hoffman.
Chicago Aeronuts Bulletin Vol. IV No. 1 (Sept. 1939)
Contains an article on rubber motors, “MATH FOR DURATION OF MODELS”, by Raoul J. Hoffman.