Otto Muck Tailsitter Patent 1938

[Jemiba]

In 1938 Otto Muck filed two patents for tailsitter VTO aircraft, bothe using very large contra-rotating
props/rotors. Both patents differed mainly in the type of landing gear.
(from Coates "Helicopters Of The Third Reich")

 

[lippischh]

The two patents in PDF :

November 19th 1941
https://depatisnet.dpma.de/DepatisNet/depatisnet?window=1&space=menu&content=treffer&action=pdf&docid=DE000000714001A&Cl=2&Bi=1&Ab=&De=2&Dr=3&Pts=&Pa=&We=&Sr=&Eam=&Cor=&Aa=&so=asc&sf=vn&firstdoc=2&NrFaxPages=3&pdfpage=1&xxxfull=1

November 24th 1942
https://depatisnet.dpma.de/DepatisNet/depatisnet?window=1&space=menu&content=treffer&action=pdf&docid=DE000000728256A&Cl=2&Bi=1&Ab=&De=2&Dr=3&Pts=&Pa=&We=&Sr=&Eam=&Cor=&Aa=&so=asc&sf=vn&firstdoc=1&NrFaxPages=3&pdfpage=1&xxxfull=1