In this article by Fly Staff for Fly RC Magazine, they describe what conventional fuel systems and unflow fuel systems are. They also discuss the conventional tank theory, pressure differential, fuel mass, the unflow theory of operation, why it is important to check a valve, tips for having a successful fuel system, and how to tune for maximum performance.
The first model aviation club was formed in 1908.. by a woman! Ms. Todd, from her childhood, was always interested in how things worked. She would disassemble toys, typewriters, and was once even scolded for using her mother’s scissors to cut wire. This interest in tinkering led her to design and patent a type writer copy holder in 1896. By the turn of the century her interest turned to aviation, and she began to experiment with rubber-powered models and airships. In 1906 she displayed one of her aircraft at the Aero Club of America show, held in Grand Central Palace, New York.