CIA-UAP-005: German Scientist's Article on "Flying Discs," 1950

Source file: CIA-UAP-005-GERMAN_SCIENTISTS_ARTICLE_ON_FLYING_DISCS.pdf Originating agency: Central Intelligence Agency (Information Report, with attachment) Report number: SO DE-27143 Classification: RESTRICTED (Approved for Release 2026) Country: Chile/Germany Place acquired: Chile, Santiago Date of information: Prior to mid-1950 Date distributed: 31 July 1950 Page count: 4 (cover sheet + 3-page attachment, all read) VIRIN: 260508-O-D0360-1082 PURSUE Release: 3

Summary

This CIA Information Report, numbered SO DE-27143, was distributed on 31 July 1950. It consists of a one-page cover sheet and a three-page attachment: a full English translation of an article by Dr. Eduard Ludwig, titled "The Mystery of the 'Flying Discs': A Contribution to Its Possible Explanation," submitted for publication in Condor, a German-language magazine published in Chile. The report was acquired in Santiago, Chile.

The CIA collection officer noted in handwriting on the cover sheet that the "significant conclusion drawn by this scientist" was that the manipulation of the "boundary layer" of air around a moving airfoil "has been implicated to produce an advantageous reaction and is the factor controlling the success of the 'flying saucer' type of airfoil."

The article itself is a technical-historical essay in which Ludwig traces the aerodynamic science behind his hypothesis through the careers of German and Russian scientists — including Joukowski, Kutta, Prandtl, Betz, Flettner, and his personal contact Professor Bock — and argues that the "flying disc" phenomenon could be explained by a rotary aircraft design using gas-turbine power and Flettner-type rotating cylinders.

Research Article

The document and its cover

The CIA cover sheet grades the source as reliable (grade "A") and the content as "Documentary." The report is marked "THIS IS UNEVALUATED INFORMATION" and lists both Army and FBI among its distribution recipients. The collector's note in handwriting on the cover — signed by what appears to be "Judith" — summarizes Ludwig's central thesis and describes it as a "significant conclusion."

Dr. Eduard Ludwig and his article

Dr. Eduard Ludwig wrote from Santiago, Chile (Avenida Cristobal Colon 1916) and submitted his article to Condor, a German-language magazine published in Chile. The article's full title is "The Mystery of the 'Flying Discs': A Contribution to Its Possible Explanation." Ludwig opens by acknowledging widespread skepticism about reports of new mysterious aircraft but argues that some detailed, coinciding accounts by technically trained observers deserve attention as a basis for classification of these aircraft.

Ludwig frames his central observation: because sightings typically occur in the dark, only the luminous parts of the craft are visible, and those luminous parts appear as shining discs or circles. He argues that these correspond to the exhaust of a rotary gas turbine, whose rotor could act simultaneously as a stabilizing top, fixed vertically relative to other turbine rings — producing in darkness the effect of "the rings of Saturn."

The German aerodynamic lineage

The bulk of the article traces the scientific lineage Ludwig believed led to the flying disc concept. He identifies the foundational discovery as the "Kutta-Joukowski Theory of Airplane-wingbeam," established before World War I by Russian Professor Joukowski of Moscow and German Professor Kutta (from the Technical High School of Stuttgart). This theory's core is the "boundary stratum" (Grenzschicht in German, "boundary layer" in modern terminology): the thin layer of air in which the transition from zero velocity to the velocity of the moving object takes place. If the object is streamlined, the boundary stratum will not sever; no whirlwinds form; and no energy is lost.

Ludwig describes how Professor H.C. Bauman, also of Stuttgart, received a patent in 1915 for the "Splitwing" technique — artificially interrupting the course of air current, tearing the boundary stratum, and achieving braking. This technique was later applied to the Junkers Ju 88 fighter plane as the "dive-brake."

At the Aerodynamic Experimental Institute of the Gottingen University, under Professors Prandtl and Betz, Constructor Flettner proved that rotating object conditions resemble those in "translatorischen" movement — producing the "Flettner-Rotor." Ludwig then describes how he personally participated in research ordered by Professor Junkers at his plant in Dessau, headed by Professor Bock, investigating whether wing uplift could be increased by attaching a Flettner-Rotor cylinder to the wing. These experiments were "extremely difficult and involved many casualties," according to Ludwig, and were eventually interrupted. Ludwig describes Professor Bock as potentially "the greatest genius of German airplane theoretics," later deported to the Soviet Union.

Supersonic research and the V-2 connection

Ludwig draws a connection to wartime supersonic research at Gottingen, where Professor Betz found that supersonic speeds created by quickly rotating propellers generated entirely new aerodynamic conditions. At supersonic speeds, tearing the boundary stratum involved much greater resistance — meaning an object with full atmospheric pressure could theoretically "hang" from the upper layer of air. Ludwig compares this to the behavior of spinning missiles: "Today we know that these quickly rotating missiles 'swim' in the surrounding layers of air and therefore lose part of their weight." He notes that the surprise at the results of the German V-2 at supersonic speeds "was not less than that which is produced today by the appearance of the mysterious 'Flying Discs.'"

Ludwig's hypothesis and conclusion

Ludwig proposes that an aircraft using Flettner Rotors — rotating cylinders providing uplift and stability — combined with a gas turbine as the starting force, would have enormous carrying capacity, make a positive starting angle at high speed possible, and achieve action-radius far surpassing conventional gasoline engines. He speculates that chemical energy carriers applicable to gas turbines, capable of melting 20 centimeters of steel plates in fractions of a second, could power such craft.

The article closes with an open question: "The future will show whether the 'Flying Discs' are only the products of imagination or whether they are the results of a far-advanced German science which, possibly, as well as the nearly finished atomic bombs, may have fallen into the hands of the Russians."

Significance

This document is a window into early Cold War anxiety about German scientific knowledge potentially in Soviet hands. The CIA's decision to collect, translate, and distribute the article indicates genuine intelligence interest in the hypothesis that flying disc sightings could be explained by advanced aerodynamic technology of German wartime origin. The article does not describe an actual UAP event but rather proposes a technical framework within which such reports could be understood as secret aircraft — a framework that was actively explored by Western intelligence agencies in the late 1940s and early 1950s.

Key People

Locations

Incidents

Notable Quotes

"Since so far the observations have been made mainly in the dark, which means that only the luminous parts of the craft are visible, every report brings the description of shining discs or circles. If one should discard the absurd conjecture that these aircraft originate from beyond this earth, then it is easy to arrive at the conclusion that the shining circles bear a relation to the exhaust of a rotary gas-turbine." — page 1 (attachment)

"The name of Professor Bock was never widely known due to his modest character, but he may have been the greatest genius of German airplane theoretics, and later, in view of his extraordinary faculties, he was named head constructor of the Ministry of German Airways and Director of the German Institute of Airways Research in Berlin-Adlershof." — page 1 (attachment)

"The surprise of the specialized scientists the world over at the astounding results of the German V-2 was not less than that which is produced today by the appearance of the mysterious 'Flying Discs.'" — page 3 (attachment)

"The future will show whether the 'Flying Discs' are only the products of imagination or whether they are the results of a far-advanced German science which, possibly, as well as the nearly finished atomic bombs, may have fallen into the hands of the Russians." — page 3 (attachment)