DU21 airfoil with an aspect ratio of 17. Original -180 to 180deg Cl, Cd, and Cm versus AOA data taken from Appendix A of DOWEC document 10046_009.pdf (numerical values obtained from Koert Lindenburg of ECN). Cl and Cd values corrected for rotational stall delay and Cd values corrected using the Viterna method for 0 to 90deg AOA by Jason Jonkman using AirfoilPrep_v2p0.xls. 1 Number of airfoil tables in this file 0.0 Table ID parameter 8.00 Stall angle (deg) 0.0 No longer used, enter zero 0.0 No longer used, enter zero 0.0 No longer used, enter zero -5.0609 Zero Cn angle of attack (deg) 6.2047 Cn slope for zero lift (dimensionless) 1.4144 Cn extrapolated to value at positive stall angle of attack -0.5324 Cn at stall value for negative angle of attack -1.50 Angle of attack for minimum CD (deg) 0.0057 Minimum CD value -180.00 0.000 0.0185 0.0000 -175.00 0.394 0.0332 0.1978 -170.00 0.788 0.0945 0.3963 -160.00 0.670 0.2809 0.2738 -155.00 0.749 0.3932 0.3118 -150.00 0.797 0.5112 0.3413 -145.00 0.818 0.6309 0.3636 -140.00 0.813 0.7485 0.3799 -135.00 0.786 0.8612 0.3911 -130.00 0.739 0.9665 0.3980 -125.00 0.675 1.0625 0.4012 -120.00 0.596 1.1476 0.4014 -115.00 0.505 1.2206 0.3990 -110.00 0.403 1.2805 0.3943 -105.00 0.294 1.3265 0.3878 -100.00 0.179 1.3582 0.3796 -95.00 0.060 1.3752 0.3700 -90.00 -0.060 1.3774 0.3591 -85.00 -0.179 1.3648 0.3471 -80.00 -0.295 1.3376 0.3340 -75.00 -0.407 1.2962 0.3199 -70.00 -0.512 1.2409 0.3049 -65.00 -0.608 1.1725 0.2890 -60.00 -0.693 1.0919 0.2722 -55.00 -0.764 1.0002 0.2545 -50.00 -0.820 0.8990 0.2359 -45.00 -0.857 0.7900 0.2163 -40.00 -0.875 0.6754 0.1958 -35.00 -0.869 0.5579 0.1744 -30.00 -0.838 0.4405 0.1520 -25.00 -0.791 0.3256 0.1262 -24.00 -0.794 0.3013 0.1170 -23.00 -0.805 0.2762 0.1059 -22.00 -0.821 0.2506 0.0931 -21.00 -0.843 0.2246 0.0788 -20.00 -0.869 0.1983 0.0631 -19.00 -0.899 0.1720 0.0464 -18.00 -0.931 0.1457 0.0286 -17.00 -0.964 0.1197 0.0102 -16.00 -0.999 0.0940 -0.0088 -15.00 -1.033 0.0689 -0.0281 -14.50 -1.050 0.0567 -0.0378 -12.01 -0.953 0.0271 -0.0349 -11.00 -0.900 0.0303 -0.0361 -9.98 -0.827 0.0287 -0.0464 -8.12 -0.536 0.0124 -0.0821 -7.62 -0.467 0.0109 -0.0924 -7.11 -0.393 0.0092 -0.1015 -6.60 -0.323 0.0083 -0.1073 -6.50 -0.311 0.0089 -0.1083 -6.00 -0.245 0.0082 -0.1112 -5.50 -0.178 0.0074 -0.1146 -5.00 -0.113 0.0069 -0.1172 -4.50 -0.048 0.0065 -0.1194 -4.00 0.016 0.0063 -0.1213 -3.50 0.080 0.0061 -0.1232 -3.00 0.145 0.0058 -0.1252 -2.50 0.208 0.0057 -0.1268 -2.00 0.270 0.0057 -0.1282 -1.50 0.333 0.0057 -0.1297 -1.00 0.396 0.0057 -0.1310 -0.50 0.458 0.0057 -0.1324 0.00 0.521 0.0057 -0.1337 0.50 0.583 0.0057 -0.1350 1.00 0.645 0.0058 -0.1363 1.50 0.706 0.0058 -0.1374 2.00 0.768 0.0059 -0.1385 2.50 0.828 0.0061 -0.1395 3.00 0.888 0.0063 -0.1403 3.50 0.948 0.0066 -0.1406 4.00 0.996 0.0071 -0.1398 4.50 1.046 0.0079 -0.1390 5.00 1.095 0.0090 -0.1378 5.50 1.145 0.0103 -0.1369 6.00 1.192 0.0113 -0.1353 6.50 1.239 0.0122 -0.1338 7.00 1.283 0.0131 -0.1317 7.50 1.324 0.0139 -0.1291 8.00 1.358 0.0147 -0.1249 8.50 1.385 0.0158 -0.1213 9.00 1.403 0.0181 -0.1177 9.50 1.401 0.0211 -0.1142 10.00 1.358 0.0255 -0.1103 10.50 1.313 0.0301 -0.1066 11.00 1.287 0.0347 -0.1032 11.50 1.274 0.0401 -0.1002 12.00 1.272 0.0468 -0.0971 12.50 1.273 0.0545 -0.0940 13.00 1.273 0.0633 -0.0909 13.50 1.273 0.0722 -0.0883 14.00 1.272 0.0806 -0.0865 14.50 1.273 0.0900 -0.0854 15.00 1.275 0.0987 -0.0849 15.50 1.281 0.1075 -0.0847 16.00 1.284 0.1170 -0.0850 16.50 1.296 0.1270 -0.0858 17.00 1.306 0.1368 -0.0869 17.50 1.308 0.1464 -0.0883 18.00 1.308 0.1562 -0.0901 18.50 1.308 0.1664 -0.0922 19.00 1.308 0.1770 -0.0949 19.50 1.307 0.1878 -0.0980 20.00 1.311 0.1987 -0.1017 20.50 1.325 0.2100 -0.1059 21.00 1.324 0.2214 -0.1105 22.00 1.277 0.2499 -0.1172 23.00 1.229 0.2786 -0.1239 24.00 1.182 0.3077 -0.1305 25.00 1.136 0.3371 -0.1370 26.00 1.093 0.3664 -0.1433 28.00 1.017 0.4246 -0.1556 30.00 0.962 0.4813 -0.1671 32.00 0.937 0.5356 -0.1778 35.00 0.947 0.6127 -0.1923 40.00 0.950 0.7396 -0.2154 45.00 0.928 0.8623 -0.2374 50.00 0.884 0.9781 -0.2583 55.00 0.821 1.0846 -0.2782 60.00 0.740 1.1796 -0.2971 65.00 0.646 1.2617 -0.3149 70.00 0.540 1.3297 -0.3318 75.00 0.425 1.3827 -0.3476 80.00 0.304 1.4202 -0.3625 85.00 0.179 1.4423 -0.3763 90.00 0.053 1.4512 -0.3890 95.00 -0.073 1.4480 -0.4004 100.00 -0.198 1.4294 -0.4105 105.00 -0.319 1.3954 -0.4191 110.00 -0.434 1.3464 -0.4260 115.00 -0.541 1.2829 -0.4308 120.00 -0.637 1.2057 -0.4333 125.00 -0.720 1.1157 -0.4330 130.00 -0.787 1.0144 -0.4294 135.00 -0.836 0.9033 -0.4219 140.00 -0.864 0.7845 -0.4098 145.00 -0.869 0.6605 -0.3922 150.00 -0.847 0.5346 -0.3682 155.00 -0.795 0.4103 -0.3364 160.00 -0.711 0.2922 -0.2954 170.00 -0.788 0.0969 -0.3966 175.00 -0.394 0.0334 -0.1978 180.00 0.000 0.0185 0.0000