Aerodynamic Characteristics of Four NACA Airfoil Sections Designed for Helicopter Rotor Blades Page: 13 of 22
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NACA RB No. L5K02
'ABLE V.- AIRFOIL SECTION CHARACTERISTICS
R = 2.6 x 106]NACA airfoil
section 3-H-13.5
7-H-12 8-H-12 9-H-12 10-H-12 (refer-
Section ence 1)
characteristics
(cL/cd)max 106 155 152 149 163
4a.c. ------ 0.005 -0.012 -0.022 0.003
cdhin 0.0055 0.oo0046 0.oo46 0.00oo4 0.0050
0.25 0.39 0.30 0.38
Low-drag range ------ to to to to
0.91 .0.93 0.76 0.88
Smooth 1.34 1.26 1.26 1.30 1.20
c max
Rough 1.10 1.15 1,12 1.14 ---
Mor at cli 0.601 0.569 0.569 0.619 0.56
cli (approx.) 0.42 0.57 0.60 0.46 0.60
t/c at 0.25c 0.119 0.117 0.117 0.108 0.1208
tx/c 0.250 0.278 0.267 0.261 0.250
a.c. position
y/c 0.02.1 0020 0.025 0.021 --------
__ ...__-.___- - I_ __ .- _NATIONAL ADVISORY
COMMITTEE FOR AERONAUTICS12
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Stivers, Louis S., Jr. & Rice, Fred J., Jr. Aerodynamic Characteristics of Four NACA Airfoil Sections Designed for Helicopter Rotor Blades, report, February 1946; (https://digital.library.unt.edu/ark:/67531/metadc61378/m1/13/: accessed April 24, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.