Gerhardt Helicopter or Gyroplane Prototype

[hesham]

Hi,

Mr. William Fredrick Gergardt designed and built a helicopter or a
gyroplane in 1930s,it had a large diameter propeller,that designer
has a multi-wing aircraft,we spoke about it before.

page 285;

https://books.google.com.eg/books?i...ce=gbs_ge_summary_r&cad=0#v=onepage&q&f=false

 

[hesham]

Hi,

this designer had some patents for a helicopters;

https://www.google.com/patents/US2135073?dq=william+gerhardt&hl=ar&sa=X&ved=0ahUKEwjVmMeblqLLAhUF2xoKHfOaCtwQ6wEIbjAJ

https://www.google.com/patents/US2371687?dq=william+gerhardt&hl=ar&sa=X&ved=0ahUKEwjVmMeblqLLAhUF2xoKHfOaCtwQ6wEIODAD

 

[hesham]

A clearer view;

http://www.avia-it.com/act/biblioteca/periodici/PDF%20Riviste/Ala%20d'Italia/L'ALA%20D'ITALIA%201934%2003.pdf