The problem of the helicopter / by E.P. Warner.

Format:

Book

Government document

Author/Creator:

Warner, Edward Pearson, 1894-1958, author.

Contributor:

United States. National Advisory Committee for Aeronautics, issuing body.

Series:

Technical note (United States. National Advisory Committee for Aeronautics) ; 4.

Technical notes / National Advisory Committee for Aeronautics ; No. 4

Language:

English

Subjects (All):

Helicopters--Design and construction.

Helicopters.

Helicopters--History.

Genre:

History.

Physical Description:

1 online resource (18 pages, 2 unnumbered pages) : illustrations.

Place of Publication:

Washington, D.C. : National Advisory Committee for Aeronautics, 1920.

Summary:

The idea of using a propeller rotating about a vertical shaft to give life and to sustain weight by balancing it directly with the thrust is almost as old as the screw propeller itself, and the elements of the theory of the action of a lifting propeller have been understood for at least fifteen years. A vast number of helicopters have been invented, many have been built, and a very, very few have been successful up to the poit of raising themselves from the ground. It is felt, therefore, that a broad survey of the problem will be of use in making clear the nature of some of the obstacles which have prevented any helicopter from reaching the stage of practical usefulness as yet and may lead to a saving of some the time and money which are constantly being squandered on attempts to demonstrate anew facts which are already perfectly well understood without the least striking at the root of the problem.

Notes:

Title from title screen (viewed June 20, 2019).

"May, 1920."

"Aerodynamical Laboratory, N.A.C.A., Langley Field, Va."

No Federal Depository Library Program (FDLP) item number.

Includes bibliographical reference (page 4).

Electronic reproduction. Denton, Texas : University of North Texas, 2011. Electronic reproduction from print master produced by University of North Texas.

Other Format:

Print version: Warner, Edward Pearson, The problem of the helicopter

OCLC:

1105632488