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Preliminary flight research on an all-movable horizontal tail as a longitudinal control for flight at high mach numbers

Author: Harold F Kleckner; Langley Aeronautical Laboratory.; United States. National Advisory Committee for Aeronautics.
Publisher: Langley Field, VA : Langley Memorial Aeronautical Laboratory, 1945.
Series: NACA collection.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
The NACA is conducting flight tests of an all-movable horizontal tail installed on a Curtiss XP-42 airplane because of its possible advantages as a longitudinal control for flight at high Mach numbers. The results are presented for some preliminary tests in the low-speed range for which the tail was very closely balanced aerodynamically and a bobweight was used to obtain stable stick-force variations with speed and  Read more...
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Additional Physical Format: Online version:
Kleckner, Harold F.
Preliminary flight research on an all-movable horizontal tail as a longitudinal control for flight at high mach numbers.
Langley Field, VA : Langley Memorial Aeronautical Laboratory, 1945
(OCoLC)857368761
Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: Harold F Kleckner; Langley Aeronautical Laboratory.; United States. National Advisory Committee for Aeronautics.
OCLC Number: 71247981
Notes: "Report no. L-89."
"Originally issued March 1945 as Advance Restricted Report L5C08."
"Report date March 1945."
"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: 8, [7] pages : illustrations ; 28 cm
Series Title: NACA collection.
Other Titles: NACA wartime reports
Responsibility: Harold F. Kleckner.

Abstract:

The NACA is conducting flight tests of an all-movable horizontal tail installed on a Curtiss XP-42 airplane because of its possible advantages as a longitudinal control for flight at high Mach numbers. The results are presented for some preliminary tests in the low-speed range for which the tail was very closely balanced aerodynamically and a bobweight was used to obtain stable stick-force variations with speed and acceleration. For these tests, the tail was hinged at 0.24 chord and was tried with two arrangements of servotab control. The elevator control was found to be unsatisfactory with the control arrangements tested. Although there were sufficient variation of stick force with acceleration in steady turns and a stable stick-force variation with speed, the near-zero variation of stick force with stick deflection resulted in an extremely sensitive control that required continuous attention in order to avoid motions of the airplane due to inadvertent movements of the control stick. For subsequent tests, the servotabs are being connected as geared unbalancing tabs in order that more conventional elevator hinge-moment characteristics may be obtained. The expected advantages of the all-movable tail with a control system utilizing tabs would of course be limited to flight at Mach numbers below those for which severe compressibility effects are encountered on the tail itself. For higher Mach numbers, the all-movable tail would require an irreversible power-boost control in order to handle the large hinge-moment increases that are expected.

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