With this country under the aegis of the Third Reich, the famous helicopter pioneer Friedrich Von Doblhoff designed a special machine.

“Chamber on blade end”

-There were combustion chambers at the rotor blade ends, where a mixture of air and gasoline was burned. This mixture came through a duct within the blades.

“Doblhoff V4”

-The important WNF metallurgical brand, still known today for its household goods and cutlery present in the department stores, was the builder of the WNF-342 helicopter.

-WNF responds to the name of Wiener Neustadter Flugzeugwerke, in the suburbs of Vienna. Four prototypes were made.

"Head and ducts"

-As it barely produced torque, like the autogiros, it had classic direction and depth controls.

-A combustion engine sent air to the rotor and also drove a propeller that produced the advance while sending its air flow to the tail empennage controls to maintain control.

-From the four prototypes, today, a V4 is located at the Smithsonian Museum in Washington.

-We obtained two schematic diagrams that complement the information in the main text.

“Doblhoff system with turbine” (PiP)

-The turbine has an exhaust heat recovery system.

"Rotor blade end"

-The tip of this blade has a control system that regulates the air output by tabs.