The Theoretical Fathers of Rocketry: Tsiolkovsky, Goddard & Oberth

History of Space Exploration

Chapter 1 · The Theoretical Fathers of Rocketry: Tsiolkovsky, Goddard & Oberth

This course follows the human, political and engineering history of getting into space. It starts before any rocket reached space, with three people who worked out on paper and in small experiments that it was possible: Konstantin Tsiolkovsky in Russia, Robert Goddard in the United States and Hermann Oberth in Central Europe. The sources are three reference biographies. They give dates and contributions clearly, and each leaves out how much the three knew of one another, which the chapter marks.

Konstantin Tsiolkovsky (1857 to 1935)

Tsiolkovsky was born on 17 September 1857 in Izhevskoye, Russian Empire, and died on 19 September 1935 in Kaluga, Soviet Union. He lost his hearing at age nine from scarlet fever and, according to the source, was denied admission to elementary schools because of the disability. He taught himself through reading, including three years in a Moscow library.

ContributionWhat the source says
The rocket equationHe derived the formula relating change in velocity to exhaust velocity and mass ratio, recording the date as 10 May 1897.
Multistage rocketsProposed in his 1929 book Space Rocket Trains, and addressed in earlier work titled "Exploration of Outer Space by Means of Rocket Devices" (1903, 1911, 1914).
Liquid propellantsHe calculated that liquid oxygen and liquid hydrogen could reach the 8,000 m/s orbital velocity, and recommended specific oxidizer and fuel pairings.
Space elevatorConceived in 1895, inspired by the newly built Eiffel Tower.
A Theorist Who Built Nothing The source states that Tsiolkovsky did not build or launch rockets. He worked through mathematical analysis and design proposals. His 1911 letter contains the line "Earth is the cradle of humanity, but one cannot live in a cradle forever." I quote it as the source gives it and did not check the rest of the letter.
The Date Is His Own Record The source says he "recorded" the rocket equation's date as 10 May 1897. That is his own dating, so I report it as his claim, not an independently verified date.

Robert Goddard (1882 to 1945)

Goddard was born on 5 October 1882 in Worcester, Massachusetts, and died on 10 August 1945 in Baltimore, Maryland. He held 214 patents. His two foundational 1914 patents described a multistage rocket (U.S. 1,102,653) and a liquid-propellant rocket (U.S. 1,103,503).

DateEvent
1919A Method of Reaching Extreme Altitudes sets out his mathematical theories, solid-fuel experiments and possibilities for atmospheric exploration. The Smithsonian distributed 1,750 copies worldwide in late 1919.
13 January 1920The New York Times mocks his moon-rocket proposal, saying he "only seems to lack the knowledge ladled out daily in high schools."
16 March 1926First liquid-fuel rocket launch, at Auburn, Massachusetts. It rose 41 feet in a 2.5-second flight and landed 184 feet away.
Summer 1930He moves to the Eden Valley Test Site near Roswell, New Mexico with Guggenheim funding ($100,000 over four years), working in relative isolation.
17 July 1969The day after Apollo 11's launch, the Times publishes "A Correction," acknowledging that "a rocket can function in a vacuum."
Small Numbers, Large Claim The 1926 flight is 41 feet and 2.5 seconds. The source treats it as foundational, and I do not dispute that, but the figures show why the launch mattered as a proof of concept and not as a distance. The source also says he eventually reached altitudes above 2.6 kilometres at Roswell, without saying in which year.

Hermann Oberth (1894 to 1989)

Oberth was born on 25 June 1894 in Nagyszeben (Sibiu), Austria-Hungary, and died on 28 December 1989 in Nuremberg, West Germany. The source says he held Hungarian, Romanian and German citizenship.

  • Dissertation: when he submitted his rocket dissertation to German universities in 1922, it was rejected as "utopian." Professor Augustin Maior at the University of Cluj accepted it, and Oberth defended it successfully on 23 May 1923.
  • The 1923 book: Die Rakete zu den Planetenräumen (The Rocket into Planetary Space) argued that spaceflight was scientifically feasible. The source says it is "generally regarded as a kind of initial spark for rocket and space travel enthusiasm in Germany."
  • The amateur society: he joined the Verein für Raumschiffahrt in 1927 and mentored enthusiasts including Wernher von Braun and Rudolf Nebel.
  • Film work: in 1928 to 1929 he was scientific advisor for the film Woman in the Moon, designing the rocket model and attempting a publicity launch.
A Link Forward Von Braun credited Oberth: "I...owe to him not only the guiding-star of my life, but also my first contact with the theoretical and practical aspects of rocketry." The source on Tsiolkovsky adds that Soviet search teams found a German translation of his work whose pages were embellished with von Braun's comments and notes. Chapter 2 picks up von Braun and the German rocket programme. I state here only what the sources say, that von Braun engaged with both men's work.

Three People, One Idea?

The Goddard source says he independently developed the rocket equation around 1912, though Tsiolkovsky published earlier, and that Goddard's version included gravity and drag, which Tsiolkovsky's did not. That is the only direct comparison any of the three sources makes.

Independence Is Not Established Here The Oberth source contains no discussion of his originality relative to the other two, and the Tsiolkovsky source notes no disputes. I did not find whether Oberth knew of Goddard's or Tsiolkovsky's work when he wrote in 1923, or whether Goddard knew Tsiolkovsky's. "Independent" appears in the Goddard source for the equation only. I do not extend it to the rest, and a claim that all three worked in isolation would need a source I have not read.
Influence Is Described Differently for Each The Tsiolkovsky source says Soviet designers Sergei Korolev and Valentin Glushko studied his works as youths and sought to implement his theories, and it credits them with turning them into reality. The Goddard source says German researchers including von Braun studied his 1919 paper and that American universities initially dismissed his work as impractical. These are the articles' own summaries of influence, not measurements, and I did not check them.
What I Did Not Verify I did not find Tsiolkovsky's own writings, the detail of Goddard's patents or the 1926 launch, the physics of the rocket equation, how the Times editorial came to be written, or what the Verein für Raumschiffahrt achieved. I also did not check the claim that Goddard's equation included gravity and drag against the original papers. The chapter presents biographies and dates, not the science.

Hands-On Exercises

Exercise 1

Make a table of the three men with birth and death years, nationality and one contribution each, using only the chapter.

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Exercise 2

A student writes "Goddard, Tsiolkovsky and Oberth each invented spaceflight independently." Use the chapter to qualify it.

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Exercise 3

Explain why a 41-foot, 2.5-second flight is described as a landmark, and say what the chapter does not tell you about how it was judged at the time.

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Quick Reference

  • Tsiolkovsky: 1857 to 1935; rocket equation (his date 10 May 1897); multistage rockets; liquid oxygen and hydrogen; built no rockets
  • Goddard: 1882 to 1945; 214 patents; 1919 paper; first liquid-fuel launch 16 March 1926 (41 feet, 2.5 seconds); Times correction 17 July 1969
  • Oberth: 1894 to 1989; dissertation rejected 1922, accepted at Cluj 1923; Die Rakete zu den Planetenräumen 1923; mentor to von Braun
  • Only stated comparison: Goddard developed the equation independently around 1912, including gravity and drag
  • Not covered: whether the three knew each other's work, the physics, the Verein's results