page_title: Petróczy-Kármán-Žurovec
section_title: Von Asboth
hierarchical_section_title: Petróczy-Kármán-Žurovec / Von Asboth
caption_attribution_description: Magyar: Asbóth Oszkár tervezte AH-4 helikopter bemutató repülésen Vígh Mihály pilótával az angol Ministry bizottsága előtt.
context_page_description: Petróczy, Kármán and Žurovec were Hungarian and Czech engineers who worked on helicopter development immediately before and during World War I. Between them they produced two experimental prototypes, the PKZ-1 and PKZ-2, intended to replace the dangerous hydrogen-filled observation balloons then in use. As such, these craft were tethered on long cables and were not intended to fly freely. After the war other engineers, notably Oszkár von Asboth, further developed the design.
context_section_description: Oszkár von Asboth was one of the researchers at Fischamend. In 1917 he commissioned Ufag to make a full-scale prototype to his own design, but it was destroyed in a fire before completion. After the war he went on to build and fly several more helicopters. One was constructed in 1920 but later destroyed on the order of the Allied Control Commission. Subsequent examples based on the PKZ-2 design were designated AH-1 to AH-4 and made over 150 successful flights between 1928 and 1930. Von Asboth later set up companies in Britain and France to promote his twin-rotor designs, and at least one machine was built by the French company.
caption: The AH-4 in flight
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