Martin Summerfield

Martin Summerfield (October 20, 1916 – July 18, 1996) was an American physicist and rocket propulsion researcher who co-founded the Aerojet Engineering Corporation in 1942 and later built Princeton University's combustion and solid-propellant propulsion laboratory. According to the National Academy of Engineering's Memorial Tributes, he was elected to the National Academy of Engineering in 1979 for contributions to rocketry, combustion research, and the international aeronautics and astronautics literature.¹

Early life and education

Summerfield was born in Brooklyn on October 20, 1916, and graduated from Brooklyn College with a B.S. in physics at the age of 20.¹ In 1936 Caltech granted him a research fellowship, and he took an M.S. in 1937 and a Ph.D. in 1941, both in physics.^{1 • 2} He was the first Ph.D. student of Professor John Donovan Strong.¹

Aerojet and the wartime rocket program

In 1940, still a Caltech graduate student, Summerfield joined the Army Air Corps Jet Propulsion Project working under Theodore von Kármán, the project intended to demonstrate the first United States jet-assisted takeoff (JATO) units in 1942.³ He served as assistant chief engineer of the project, where he made early discoveries enabling modern high-thrust liquid rocket engines and guided development leading to the first practical U.S. JATO of aircraft.¹ During this initial research period he made what the NASA history paper calls fundamental discoveries regarding hydrocarbon fuel burning times and regenerative cooling in liquid-fueled rockets.² The JATO requirement was about 0.8 kN of total thrust for 12 seconds on an Ercoupe aircraft of less than 450 kg including the pilot; the early solid motors used by John Parsons each burned 0.9 kg of a pressed black-powder variant in 4.4 cm diameter tubes about 28 cm long, with a shelf life under two days.⁵ Caltech conducted flight demonstrations at March Field, Riverside, California, in the summer of 1941.²

By 1942 JATO development had reached production scale: the Army Air Corps asked the Caltech researchers to produce about 1,600 units by the end of 1943, and von Kármán, Edward S. Forman, Andrew G. Haley, Frank J. Malina, John W. Parsons, and Summerfield formed the Aerojet Engineering Company in response.¹ Articles of incorporation drawn up by Haley were filed with the Delaware Secretary of State on 19 March 1942; the six incorporators served as the corporation's initial officers.² According to a EUCASS paper on Summerfield, his liquid rockets were flight tested in 1942, and the facilities he and Malina initiated had by 1945 become the Jet Propulsion Laboratory.⁵ In 1945 General Tire & Rubber bought the company; with the merger of Crosley Motors in 1953, the subsidiary was officially renamed Aerojet-General Corporation.^{1 • 10}

Jet Propulsion Laboratory, 1945–1949

From 1945 to 1949 Summerfield was chief of the Rocket Research Division at Caltech's Jet Propulsion Laboratory.¹ In this period, as an Aerojet founder and a JPL manager, he led development of liquid-propellant propulsion and planning for long-range missiles.³

Career at Princeton

In 1948 Princeton received a contract from the Air Force and Navy for a series of ten or more volumes on high-speed aerodynamics and jet propulsion, and hired Summerfield from Caltech's JPL as editor, with Joseph Charyk as associate editor; the editorial board included von Kármán, Hugh Dryden, and H. S. Taylor.⁶ The NAE memoir states that Summerfield turned the general editorship over to Charyk in 1952.¹

Summerfield's broad interest in propulsion and his expertise in solid propellant rockets led to his appointment as a full professor at Princeton in 1950.⁶ From the mid-1950s to the mid-1970s he established a combustion and solid propulsion laboratory in the Guggenheim Laboratories for the Aerospace Propulsion Sciences, with full propellant processing, motor fabrication, testing, and diagnostic capabilities; it operated for about 25 years with no injuries or accidents.¹ According to a 2011 AIAA paper, he retired from Princeton in 1978.³ The memoir records about 40 dissertations and theses supervised, all dealing with some aspect of combustion; the 2011 AIAA account of his laboratory gives the number as fifty.^{1 • 3}

Representative work

In his ARS Journal paper "A Theory of Unstable Combustion in Liquid Propellant Rocket Systems," he attributed the low-frequency oscillations ("chugging") sometimes observed in liquid propellant rocket engines to oscillatory propellant flow induced by a combustion time lag, and derived conditions for suppressing such oscillations: stability could be achieved by increases in the length of the feed line, the velocity of the propellant in the feed line, the ratio of feed pressure to chamber pressure, and the ratio of chamber volume to nozzle area.⁴ According to a DTIC technical report, his Princeton group also studied oscillatory burning of solid rocket propellants under a combustion-instability contract beginning 1 June 1963, on which he was listed as Professor of Aerospace Propulsion at the Guggenheim Laboratories.⁸

In 1960 he was founding editor-in-chief of the ARS/AIAA Progress in Astronautics and Aeronautics book series and volume editor of Solid Propellant Rocket Research, the series' Volume 1.¹

Editing and the scientific societies

As editor of the ARS Journal, Summerfield was the major force in transforming the American Rocket Society into a technical society, and he served as ARS president in 1962 during the merger that formed the American Institute of Aeronautics and Astronautics.¹ In 1963–1964 he was AIAA's first vice president for publications; he was vice president of the International Astronautical Federation from 1963 to 1965 and editor-in-chief of Acta Astronautica from 1966 to 1973.¹

Honors and later years

Summerfield won the Pendray Award for literature in 1954 and the AIAA Wyld Award in 1977 for contributions to rocket propulsion; in 1996 the AIAA elevated him to honorary fellow.¹ In 1975 he founded Princeton Combustion Laboratory, Inc., which with Neale A. Messina became Princeton Combustion Research Laboratories (PCRL), acquired by Lockheed Martin around 1994.¹ After retiring from Princeton in 1978 he devoted more time to PCRL.³

References

1. Martin Summerfield 1916–1996, Memorial Tributes, Volume 15, National Academy of Engineering
2. Aerojet Engineering Corporation: Stimulation and Creation, 1935–1942 (NASA NTRS)
3. Martin Summerfield and His Princeton University Propulsion and Combustion Laboratory (AIAA 2011)
4. A Theory of Unstable Combustion in Liquid Propellant Rocket Systems (ARS Journal)
5. Martin Summerfield and the first USA operational liquid-propellant rockets (EUCASS)
6. Aerospace Education and Research at Princeton University 1942–1975
7. Martin Summerfield, Prabook
8. Solid Propellant Combustion Instability: Oscillatory Burning of Solid Rocket Propellants (DTIC)
9. Martin Summerfield and the first USA operational liquid rockets (EUCASS 2013 abstract)
10. Aerojet rocketdyne history (l3harris.com)

Topic: Encyclopedia › Technology and the built world › Engineers and computer scientists › Engineers and materials scientists › Researchers in mechanical and aerospace engineering, robotics, and control › Aerospace Propulsion

Initially written Sep 21, 2026 · Reviewed: Sep 25, 2026; Sep 30, 2026 · Edited: Sep 25, 2026; Sep 30, 2026; Oct 11, 2026 · Last review: Sep 30, 2026

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