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After his military service, Landmann studied mechanical engineering at the Technical University of Aachen from 1919 to 1924, where he joined the FVA in 1920 and developed his first aircraft, the La 1 "Pipö", which was flown in by Wolfgang Klemperer the following year. From 1926 onwards, he developed and built gliders and sports aircraft in Bonn, and later in Szczecin. In 1930 he became assistant to Georg Madelung at the Institute of Aeronautical Engineering at the Technical University of Stuttgart, and in 1933 lecturer in aircraft construction at the technical school in Strelitz and from 1935 to 1945 lecturer in aerodynamics and flight mechanics in Szczecin. In 1937 his work "Construction of Motor Aircraft" was published. During the Second World War, he also worked in Rostock at the Heinkel works. In 1944 he was drafted into the Luftwaffe and in May 1945 he was taken prisoner by the Soviets, from which he was released after four months. After the end of the war, Landmann worked successively as an aerodynamicist for wind turbines in Rostock and as a designer of hydrofoils in Roßlau from 1945 onwards. After graduating, he taught as a professor of aircraft design and construction at the Technical Faculty of the University of Rostock from 1952.

In connection with the development of the East German aircraft industry in Dresden, he was appointed professor of aerodynamics at the Faculty of Lightweight Engineering – later the Faculty of Aeronautical Engineering – at the then Technical University of Dresden on 1 July 1953, where he designed further aircraft between 1955 and 1962, of which the La 16 and La 17 motor gliders were built and tested. After the closure of this faculty in 1961 until his retirement in 1963, he worked at the Institute of Lightweight Engineering at the TU Dresden, but continued to teach at the Institute of Machine Elements until 1965/66.
Hermann Landmann, Bonn aircraft designer and aviator
Hermann Landmann was born in Bonn in 1898. He attended the Städtisches Gymnasium zu Bonn and was a pupil of Professor Milarch. He then studied at the Technical University in Aachen, where he passed his diploma in engineering. He built his first glider, La 1, as early as 1922 at the Technical University of Aachen. From 1923 he flew secretly on self-made gliders on the Rodderberg near Mehlem, before he became active at the Hangelar airfield in 1926.
La 2 had been demolished in 1925 during construction. For the Bonn club, he designed gliders and motor planes. As early as 1928, he installed a MAG engine donated by the Imperia motorcycle factory in a glider of the type "Prüfling" behind the driver's seat. A remote shaft led to the propeller over the bow. This aircraft was known as "Jupp".
The La 3 was a glider. In 1928 he designed the La 4 for the club member Wisskirchen, the La 5 "Jüppchen" for Schiller and the La 7 "Sonny Boy" for Dr. Schroedter. The La 6, built in 1929, was again a glider. From 1935 he taught at the State School of Engineering in Szczecin.
He experienced the Second World War as a flight engineer and designer of gliders and powered aircraft. After the collapse in 1945, he remained in the Eastern Zone. Landmann taught as a professor at the Technical University of Dresden for many years. He died on January 29, 1977 in Dresden.