Model tests on the economy and effectiveness of helicopter propellers / by Max M. Munk.

Format:

Book

Government document

Author/Creator:

Munk, Max M. (Max Michael), 1890- author.

Contributor:

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

Series:

Technical note (United States. National Advisory Committee for Aeronautics) ; 221.

Technical notes / National Advisory Committee for Aeronautics ; No. 221

Language:

English

Subjects (All):

Rotors (Helicopters)--Aerodynamics--Measurement.

Rotors (Helicopters).

Propellers, Aerial.

Physical Description:

1 online resource (26 pages, 5 unnumbered pages) : illustrations.

Place of Publication:

[Washington, D.C.] : National Advisory Committee for Aeronautics, 1925.

Summary:

The following investigation to determine the economy and effectiveness of helicopter propellers was conducted at the Langley Memorial Aeronautical Laboratory. The air forces observed with various propeller models when driven as windmills under different angles of tilting are reported and discussed.

The average velocity of the helicopter blades relative to the air is greater than that of the airplane wings, but this velocity is less variable for different conditions of flight. The former fact implies less economy, the latter greater economy. Hence the helicopter may turn out to be more economical than the airplane wing for extreme velocities or horizontal flight, the airplane then requiring a very great speed range.

Notes:

Description based on online resource, PDF version; title from title page (TRAIL, viewed May 15, 2020).

No Federal Depository Library Program (FDLP) item number.

Includes bibliographical reference (page 26).

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

Other Format:

Print version: Munk, Max M. Model tests on the economy and effectiveness of helicopter propellers

OCLC:

1127388857