The son of the dentist Robert Kronfeld (1874-1946) and his wife Hedwig, born German († 1905; sister of the editor Paul Deutsch ), was the nephew of the doctor and writer Adolf Kronfeld and the botanist Ernst Moriz Kronfeld . His brother was the doctor , dentist and famous oral pathologist Rudolf Kronfeld (1901–1940).
On August 8, 1928, Kronfeld won the duration of flight in 7 hours and 54 minutes at the 1928 Rhön gliding competition on Rhöngeist by Alexander Lippisch . On May 15, 1929, he was the first person to sail more than 100 km. In 1929/30 he achieved several world records, distance records (164.51 km) and height records (up to 2589 m) with the machines " Wien " and " Austria ".
He designed the Kronfeld auto winch for towing tests , undertook the first mountain glider flight ( Rax , Jakobskogel) in 1929 and shortly afterwards, on February 26, 1929, the first glider flight from the Kahlenberg (crossing the Danube and landing on the ice cover of the Kuchelau harbor ). He organized major flight days and was the first glider pilot to cross the English Channel in both directions in 1931: it took off on June 20, 1931 at 7 p.m. from Boulogne-sur-Mer and landed at Dover Castle . From there he started the return flight around 9 p.m. on the same day and landed again at Boulogne-sur-Mer ( St. Inglevert ).
Due to his Jewish origins, he emigrated to England in 1933 and took British citizenship in 1939. In the mid-1930s he took over the British Aircraft Company , which he renamed Kronfeld Ltd. from May 21, 1936. continued. The most famous product was the Kronfeld Drone light aircraft . In the Second World War he put himself in the service of the Royal Air Force, where he made it to the rank of squadron leader.
On February 12, 1948, he took off with a flying wing glider for a test flight over southern England. The aircraft was still immature and came into a tailspin shortly after releasing, overturned and crashed from a height of 5000 m near the village of Lasham. On board was an observer who was able to save himself with the parachute. Kronfeld himself died in the rubble of the General Aircraft GAL.56 .
His gliders were:
- 1928 "Rhöngeist"
- 1929 "Vienna"
- 1930 "Austria"
- 1932 "Austria II"
- 1933 "Ku 7"
- 1933 "Austria III"
In 1930 Kronfeld was the winner of the Hindenburg Cup for gliding.
In his honor, the Oerlinghausen gliding school annually announces the "Kronfeld competition" along the route of the first 100 km glider he completed on May 15, 1929.
- Philipp Winter: Glider pilot Robert Kronfeld . Winkler, Vienna (among others) 1932.
- Karl Theodor Haanen: A glider pilot - Robert Kronfeld . Luftfahrt-Verlag Walter Zuerl, Munich 1962
- Austrian Biographical Lexicon 1815–1950 (ÖBL). Volume 4, Verlag der Österreichischen Akademie der Wissenschaften, Vienna 1969, p. 295 f. (Direct links on , ). In:
- Rolf Nagel, Thorsten Bauer: Kassel and the aviation industry since 1923 . A. Bernecker Verlag GmbH, Melsungen 2015, ISBN 978-3-87064-147-4 .
- Flugsport - illustrated aviation magazine for the entire flight being . In: Carl Oskar Ursinus (Ed.): Flugsport . Verlag für Flugsport, Frankfurt am Main 1920 ( Flugsport in the luftfahrt-bibliothek.de [accessed on March 7, 2020]).
- Aviation 1928 No. 18, 29 August 1928 , p. 346
- The first glider flight from Kahlenberg. In: Arbeiter-Zeitung , No. 58/1929 (XLII. Year), February 27, 1929, p. 6, column 4 below. (Online at ANNO ). .
- GAL.56 and Kronfeld accident
|BRIEF DESCRIPTION||Austrian glider pioneer|
|DATE OF BIRTH||May 5, 1904|
|PLACE OF BIRTH||Vienna|
|DATE OF DEATH||February 12, 1948|
|Place of death||at Lasham , Hampshire , UK|