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Flight tests of a helicopter in autorotation, including a comparison with theory

Author: Alfred Gessow; Garry C Jr Myers; United States. National Advisory Committee for Aeronautics.; Langley Aeronautical Laboratory.
Publisher: Washington, D.C. : National Advisory Committee for Aeronautics, 1947.
Series: Technical note (United States. National Advisory Committee for Aeronautics), no. 1267.
Edition/Format:   book_printbook : National government publication : EnglishView all editions and formats
Database:WorldCat
Summary:
The results of glide performance tests conducted on a test helicopter with its original production blades in the autorotation condition are presented. The data were reduced to coefficient form, and performance at standard sea-level conditions was calculated. The experimentally determined rotor drag-lift ratios were compared with theoretical calculations, and a similar comparison was made for previously obtained  Read more...
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Material Type: Government publication, National government publication
Document Type: Book
All Authors / Contributors: Alfred Gessow; Garry C Jr Myers; United States. National Advisory Committee for Aeronautics.; Langley Aeronautical Laboratory.
OCLC Number: 38201730
Notes: "April 1947."
Cover title.
NACA TN. No. 1267.
Description: 13, [12] p. : ill., tables ; 278 cm.
Series Title: Technical note (United States. National Advisory Committee for Aeronautics), no. 1267.
Responsibility: by Alfred Gessow and Garry C. Myers, Jr.

Abstract:

The results of glide performance tests conducted on a test helicopter with its original production blades in the autorotation condition are presented. The data were reduced to coefficient form, and performance at standard sea-level conditions was calculated. The experimentally determined rotor drag-lift ratios were compared with theoretical calculations, and a similar comparison was made for previously obtained power-on flight data. In addition, the improvement in power-off (autorotation) performance that results from operating with aerodynamically cleaner blades was investigated.

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