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Krafft Arnold Ehricke
Krafft Arnold Ehricke
	Kraft Ehricke and satellite models, 1957
Born	March 24, 1917; Berlin, Germany
Died	December 11, 1984 (aged 67); La Jolla, California, US
Alma mater	Technische Universität Berlin
Occupation	Rocket engineer
Known for	Centaur Upper Stage
Spouse	Ingeborg Maria Mattull

Krafft Arnold Ehricke (March 24, 1917 – December 11, 1984) was a German rocket-propulsion engineer and advocate for space colonization. Ehricke is a co-designer of the first Centaur liquid oxygen/liquid hydrogen upper stage.

Biography

Born in Berlin, Ehricke believed in the feasibility of space travel from a very young age, influenced by his viewing of the Fritz Lang film Woman in the Moon. At the age of 12, he formed his own rocket society. He attended the Technische Hochschule in Berlin (today Technische Universität Berlin) and studied celestial mechanics and nuclear physics under physicists including Hans Geiger and Werner Heisenberg, attaining his degree in Aeronautical Engineering.^[2]

He worked at Peenemünde as a propulsion engineer from 1942 to 1945 with Walter Thiel,^[1] then went to the United States with other German rocket scientists and technicians under "Operation Paperclip" in 1947. He worked for a short time with the Von Braun Rocket Team at Huntsville.^[1]

In 1948, while working for the U.S. Army, Ehricke wrote a story about a crewed mission to Mars called "Expedition Ares". It anticipated the many challenges that still face explorers who will make the journey in the future.^[3] In the same year he wrote a book with Wernher von Braun, The Mars Project, which detailed how man could travel to Mars using a ferry system.^[4]

Upon leaving government service in 1952, Ehricke worked at Bell Aircraft, and then moved to Convair in 1954.^[1] While at Convair, he designed the D-1 Centaur, the world's first upper-stage-booster that used liquid hydrogen and oxygen.^[2]^[5] He also created an early space station design, based on launch by Convair's Atlas rocket. The NEXUS reusable rocket was a 1960s concept designed by a group at General Dynamics led by Ehricke. Also, during his stay at General Dynamics, he participated in Project Orion (nuclear propulsion).

In 1966, Ehricke was inducted into the International Aerospace Hall of Fame for his engineering achievements and his influential ideas on the purpose of space exploration.^[6]

Ehricke undertook a major, multi-decade study of the industrial development of the Moon, which he described as Earth's "seventh continent." His lunar industrialization concept was based on the most advanced technologies, such as nuclear-powered freight transporters, and using fusion energy to power his city, Selenopolis, on the Moon.^[7] Ehricke famously stated in 1984, "If God wanted man to become a spacefaring species, He would have given man a Moon."^[8]

He married Ingeborg Ehricke (born 12 September 1922).^[9]

Ehricke received a space burial on April 21, 1997, when a rocket sent a small amount of his cremated remains into Earth orbit.^[10]

Contributions to space flight dynamics

Ehricke was an accomplished practitioner in the field of astrodynamics and its applications. His two-volume work entitled Space Flight is probably the most complete and surely the most useful introduction to this complex subject ever written. ^{[citation needed]} It focuses on methods for exploration of the solar system. Although he was not the first, he clearly demonstrated the so-called "gravity assist" method for utilizing hyperbolic encounters with an intermediate planet to increase (or decrease) the velocity and orbital elements of a space vehicle.^[11] This technique opened the entire solar system to robotic exploration by using what he called "Instrumented Comets." Examples include the Voyager missions to the outer planets and the recent successful New Horizons mission to Pluto. His contribution to this important field of exploration has been neglected for many decades and incorrect claims of the "invention" of what is now called gravity assist were made by Minovitch.

Extraterrestrial Imperative

Ehricke promoted a philosophical concept called the "Extraterrestrial Imperative." This idea refers to Ehricke's belief that it was the responsibility of humanity to explore space and exploit the resources of the Solar System, in order to sustain the development of the species. There are no external "limits to growth," Ehricke insisted, because while the Earth is a "closed system," the exploration of space opens the universe to humanity. For Ehricke, human creativity has no limits.^[12]^[13]

References

^ ^a ^b ^c ^d "Krafft Arnold Ehricke Papers". National Air and Space Museum. Retrieved March 12, 2023.
^ ^a ^b "Ehricke". Astronautix.com. Archived from the original on 2010-10-19. Retrieved 2010-08-29.
^ Marsha Freeman (March 24, 2017). "KRAFFT EHRICKE. The Moral Imperative of Space Exploration" (PDF). George Mason University. p. 29. Retrieved March 12, 2023.
^ A. A. Jackson (October 21–25, 2019). "Chapter 12. The Mars Project 1948 to 1956" (PDF). Fifty-Third Symposium of the International Academy of Astronautics: 264. Retrieved March 13, 2023.
^ "Ehricke, Krafft Arnold (1917-1984)". Daviddarling.info. 2007-02-01. Retrieved 2010-08-29.
^ Sprekelmeyer, Linda, editor. These We Honor: The International Aerospace Hall of Fame. Donning Co. Publishers, 2006. ISBN 978-1-57864-397-4.
^ Oyang Teng. "Book Review: Krafft Ehricke's Extraterrestrial Imperative". The Schiller Institute. Retrieved March 13, 2023.
^ Paul D Spudis. "The Lunar Anthropic Principle". Smithsonian Magazine. Retrieved June 30, 2024.
^ Biography for Krafft Arnold Ehricke at IMDb
^ Emily Carney. "Krafft A. Ehricke: Remembering a Rocket Visionary". Celestis.com. Retrieved March 12, 2023.
^ Negri, Rodolfo Batista; Prado, Antônio Fernando Bertachini de Alme (14 July 2020). "A historical review of the theory of gravity-assists in the pre-spaceflight era". Journal of the Brazilian Society of Mechanical Sciences and Engineering. 42 (8). doi:10.1007/s40430-020-02489-x. S2CID 220510617.
^ Ehricke, Krafft, "The Extraterrestrial Imperative," Archived 2016-03-03 at the Wayback Machine Air University Review, January–February 1978
^ "Krafft Ehricke Extraterrestrial Imperative by Marsha Freeman An Apogee Books Publication". Apogeespacebooks.com. Retrieved 2010-08-29.