1940 · Philadelphia
"Malina made a number of other important contributions to rocketry during his career. With von Kármán, he developed in 1940 the theory of constant-thrust long-duration solid fuel rocket motors. In 1942 he and another associate, Mark Mills, designed and patented a safety pressure relief valve for solid propellant rocket motors. In 1943, with Martin Summerfield, Malina introduced and patented improvements in methods of applying rocket propulsion to flying boats. In 1946 they formulated the 'Malina-Summerfield Criterion' for step-rockets. This criterion stated that each step of the optimum step-rocket has an equal ratio between its payload mass and the total mass of the step-rocket propelling that payload."
"As an early pioneer in the field of rocketry and propulsion, Malina made many valuable contributions. His innovations in long-duration propulsion and solid and liquid fuel propellants were particularly important. According to a 1958 letter to Malina from Rear Admiral D. S. Fahrney, U.S.N. (retired), 'It was based on your findings that we produced the first jet propelled guided missile in this country.'" (see American National Biography online for quotation citations) The present work is a further study of the general theory of operation of the constant pressure rocket motor unit, and references work done by Goddard and others. These theoretical studies were undertaken before practical trials were undertaken due to the high costs of building and testing actual rockets. Much of this research resulted in the practical development of solid-fuel rocket motors. (Inventory #: 15378)