Contains an article on rubber motors, “MATH FOR DURATION OF MODELS”, by Raoul J. Hoffman.
I am a grandson of Chicago Aeronut Otto Curth. I lived in Rockford when I was young, but moved to Southern California in 1985. It didn't quite kill the opportunity to model with my grandfather, but it certainly hampered it. Since I wasn't (and probably won't ever be) able to join the club, I decided to at least set up this site to help preserve and share the history for anyone who may have an interest.