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Flight investigation at high speeds of profile drag of wing of a P-47D airplane having production surfaces covered with camouflage paint

Author: John A Zalovcik; Fred L Daum; Langley Aeronautical Laboratory.; United States. National Advisory Committee for Aeronautics.
Publisher: Langley Field, VA : Langley Memorial Aeronautical Laboratory, 1946.
Series: NACA collection.
Edition/Format:   Print book : National government publication : EnglishView all editions and formats
Summary:
A flight investigation was made at high speeds to determine the profile drag of a P-47D airplane wing having production surfaces covered with camouflage paint. The profile drag of a wing section somewhat out-board of the flap was determined by means of wake surveys in tests made over a range of airplane lift coefficients from 0.06 to 0.69 and airplane Mach numbers from 0.25 to 0.78. The results of the tests  Read more...
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Additional Physical Format: Online version:
Zalovcik, John A.
Flight investigation at high speeds of profile drag of wing of a P-47D airplane having production surfaces covered with camouflage paint.
Langley Field, VA : Langley Memorial Aeronautical Laboratory, 1946
(OCoLC)857368887
Material Type: Government publication, National government publication, Internet resource
Document Type: Book, Internet Resource
All Authors / Contributors: John A Zalovcik; Fred L Daum; Langley Aeronautical Laboratory.; United States. National Advisory Committee for Aeronautics.
OCLC Number: 71205552
Notes: "Report no. L-98."
"Originally issued March 1946 as Advance Confidential Report L6B21."
"Report date March 1946."
"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: 7, [7] pages : illustrations ; 28 cm
Series Title: NACA collection.
Other Titles: NACA wartime reports
Responsibility: by John A. Zalovcik and Fred L. Daum.

Abstract:

A flight investigation was made at high speeds to determine the profile drag of a P-47D airplane wing having production surfaces covered with camouflage paint. The profile drag of a wing section somewhat out-board of the flap was determined by means of wake surveys in tests made over a range of airplane lift coefficients from 0.06 to 0.69 and airplane Mach numbers from 0.25 to 0.78. The results of the tests indicated that a minimum profile-drag coefficient of 0.0097 was attained for lift coefficients from 0.16 to 0.25 at Mach numbers less than 0.67. Below the Mach number at which compressibility shock occurred, variations in Mach number of as much as 0.2 appeared to have no effect on profile-drag coefficient. The variation in Reynolds number corresponding to this variation in Mach number, however, was appreciable and may have had some effect on the results obtained. Comparison of the Mach number at which shock losses were first evident in the wake with the critical Mach number indicated that shock was not evident until the critical Mach number was exceeded by at least 0.025.

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