Wind Tunnel Investigation of the Effects of Slot Shape and Flap Location on the Characteristics of a Low-Drag Airfoil Equipped with a 0.25-Chord Slotted Flap Page: 3 of 55
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MR No. A4L28
INT ODUC TION
For some time the National Advisory Committee for Aeronautics
has been investigating airfoils equipped with high--lift devices for
the purpose of improving the performance characteristics of these
airfoils. The results of tests of low-drag airfoils equipped wi-th
slotted flaps have been presented in reference 1. Tie results of
reference 2 show that, on conventional airfoils, openings in ihe
airfoil surface caused a measurable increase in drag of the airfoil
for the conduit ion of high-spoee flight. It was also found that t.he
location of the flap had a large influence on the magnitude of the
max'_mum obtainable lift coefficients0
To provide a basis for a study of T:he characteristics of
drooped ailerons, the effects of slot shape and flap location on
the section aerodynamic characteristics of a low-.rag airfoil were
determined and.d practical flap paths were selected.
The bests were conducted in the 7- by 10-foot wind. turrnel No. 1
of the Ames Aeronautical L.:aboratory.
COEFFICIENTS ALD CORRECTIONS
The coefficients used in the presentation of results are as
cZ section lift coefficient (i!qc)
Ac3 increment of section lift coefficient due to flap deflection
cd.o profile-drag coefficient (Cdo/qc)
cm section, pitching-moment coefficient about quarter chord of
section with flap in neutral position (m/Qc2)
Ac increment of section pitching-moment coefficient due to flap
2 secLion lift
do profile drag
m section pitching moment
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Holtzclaw, Ralph W. & Weisman, Yale. Wind Tunnel Investigation of the Effects of Slot Shape and Flap Location on the Characteristics of a Low-Drag Airfoil Equipped with a 0.25-Chord Slotted Flap, report, December 1944; (https://digital.library.unt.edu/ark:/67531/metadc61426/m1/3/: accessed April 18, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.