NACA issues TM 340

Thursday, January 1, 1925



One of the first documents to consider the technical promise and issues of the helicopter. The note was a reproduction of a an article in the journal "Mechanical Engineering" published mid-November 1924. A very important document from an historical perspective.

Source: "An Introduction to the Helicopter", Dr. Alexander Klemin, NACA-TM-340.


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Alexander Klemin