Keefer Gravital Radical Airliner Project of 1931

[hesham]

Hi,

Mr. Charles H. Keefer studies 15 years for his design,it had a ducted fan powered engines,
and it was an airliner with twin-boom and very small canard,with floats to land on the water,
called Gravital.

https://books.google.com.eg/books?id=BSZwdyVs8lYC&pg=PA32&dq=keefer+gravital+plane+magazine&hl=ar&sa=X&ved=0ahUKEwiMn6-oifrKAhVLAxoKHTptDOoQ6AEIHDAA#v=onepage&q=keefer%20gravital%20plane%20magazine&f=false

 

[steelpillow]

Wonderful! A real gem of insanity, the obsolete principle of the paddle steamer applied to aircraft lift. Offhand, I cannot imagine a less efficient way to generate powered lift.

 

[hesham]

You are right my dear Dan,

and it was a very radical design.