• Login via
  • or
  • New here ?

In 1918, these two engineers were first to introduce the co-axial design of helicopters, where rotors are at the top of the aircraft.

A.Juan de la Cierva and Arthur Young
B.Jan Bahyl and Louis Brequet
C.Theodore von Karman and Asboth Oszkar
D.Paul Cornu and Emile Berliner
Answer and Feedback
Answer:C

do you want?

view more test

Share this post

Some other questions you may be interested in.

Loading...