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Flight studies of the horizontal-tail loads experienced by a modern pursuit airplane in abrupt maneuvers

Author: Langley Aeronautical Laboratory.; United States. National Advisory Committee for Aeronautics.
Publisher: Langley Field, VA : Langley Memorial Aeronautical Laboratory, 1944.
Series: NACA collection.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
Flight measurements were made on a modern pursuit airplane to determine the approximate magnitude of the horizontal tail loads in accelerated flight. In these flight measurements, pressures at a few points were used as an index of the tail loads by correlating these pressures with complete pressure-distribution data obtained in the NACA full-scale tunnel. In addition, strain gages and motion pictures of tail  Read more...
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Additional Physical Format: Online version:
Langley Aeronautical Laboratory.
Flight studies of the horizontal-tail loads experienced by a modern pursuit airplane in abrupt maneuvers.
Langley Field, VA : Langley Memorial Aeronautical Laboratory, 1944
(OCoLC)857368805
Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Langley Aeronautical Laboratory.; United States. National Advisory Committee for Aeronautics.
OCLC Number: 71222653
Notes: "Report no. L-93."
"Originally issued June 1944 as Advance Restricted Report L4F05."
"Report date June 1944."
"NACA WARTIME REPORTS are reprints of papers originally issued to provide rapid distribution of advance research results to an authorized group requiring them for the war effort. They were previously held under a security status but are now unclassified. Some of these reports were not technically edited. All have been reproduced without change in order to expedite general distribution."
Description: 14, [25] pages : illustrations ; 28 cm
Series Title: NACA collection.
Other Titles: NACA wartime reports
Responsibility: by Flight Research Maneuvers Section Langley Aeronautical Laboratory.

Abstract:

Flight measurements were made on a modern pursuit airplane to determine the approximate magnitude of the horizontal tail loads in accelerated flight. In these flight measurements, pressures at a few points were used as an index of the tail loads by correlating these pressures with complete pressure-distribution data obtained in the NACA full-scale tunnel. In addition, strain gages and motion pictures of tail deflections were used to explore the general nature and order of magnitude of the fluctuating tail loads in accelerated stalls. The results indicated that, if the airplane were not stalled, a total up load of 5700 pounds would be experienced on the horizontal tail in an 8g pull-up and that, with power on, this load would be distributed unsymmetrically with about 800 pounds more up load on the left stabilizer than on the right. When stalling occurred there was an initial abrupt increase in the up tail load of the order of 100 percent of the previous load, which was followed by repeated load and stress variations due to tail buffeting. Under the condition of tail buffeting, the possibility of excessive stresses due to resonance was indicated.

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