Maybe the name of the designer here,am I right ?.hesham said:Unknown ornithopter.
here is the source,but it is not working.
(Edit: Judging the search results, the original source could be the DVD box "A Century of Flight: 100 Years of Aviation")
Hi,The third is the German Filter "Schwan Eins" built by Dahm & Krüger and shown at Hannover in 1958. 4 hp motor .