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NREL's S820 Airfoil (s820-nr)

NREL's S820 Airfoil - NREL HAWT airfoil S820 tip 16.0% Dia=10 to 20 m Re=1.3E+6 Clmax(S)=1.10 Clmax(R)=1.06 Restrained max lift coef


Airfoil s820-nr
Details Dat file Parser  
(s820-nr) NREL's S820 Airfoil
NREL HAWT airfoil S820 tip 16.0% Dia=10 to 20 m Re=1.3E+6 Clmax(S)=1.10 Clmax(R)=1.06 Restrained max lift coef
Max thickness 16% at 45.1% chord.
Max camber 2.1% at 59.7% chord
Source NWTC National WInd Technology Center
Source dat file
The dat file is in Selig format
NREL's S820 Airfoil
   x/c        y/c
1.000000   0.000000
0.996214   0.000505
0.985214   0.002540
0.967892   0.006537
0.945228   0.012390
0.917963   0.019640
0.886485   0.027777
0.850998   0.036689
0.812173   0.046401
0.770798   0.056654
0.727639   0.067030
0.683412   0.076946
0.638577   0.085468
0.592824   0.092241
0.546545   0.097201
0.499848   0.100066
0.452681   0.101025
0.405512   0.100437
0.358861   0.098462
0.313252   0.095223
0.269179   0.090832
0.227135   0.085402
0.187577   0.079047
0.150957   0.071882
0.117679   0.064007
0.088084   0.055543
0.062503   0.046603
0.041136   0.037327
0.024243   0.027843
0.011711   0.018325
0.003650   0.009309
0.000127   0.001407
0.000109   0.001293
0.000008  -0.000335
0.000091  -0.001066
0.000286  -0.001719
0.000646  -0.002321
0.001162  -0.002929
0.002460  -0.004090
0.002568  -0.004173
0.012145  -0.009433
0.027631  -0.015109
0.048455  -0.020953
0.074139  -0.026826
0.104315  -0.032597
0.138524  -0.038136
0.176342  -0.043316
0.217272  -0.048005
0.260834  -0.052072
0.306489  -0.055382
0.353714  -0.057789
0.401939  -0.059126
0.450609  -0.059167
0.499228  -0.057439
0.547944  -0.053587
0.596957  -0.048001
0.645793  -0.041049
0.694524  -0.033172
0.742551  -0.025276
0.789038  -0.017945
0.833084  -0.011608
0.873751  -0.006548
0.910106  -0.002900
0.941260  -0.000641
0.966410   0.000405
0.984887   0.000559
0.996194   0.000246
1.000000   0.000000
Dat file parser warnings
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Polars for NREL's S820 Airfoil (s820-nr)

PlotAirfoilReynolds #NcritMax Cl/CdDescriptionSource 
   s820-nr50,000926.8 at α=9.75°Mach=0 Ncrit=9Xfoil predictionDetails
   s820-nr50,000522.4 at α=9.75°Mach=0 Ncrit=5Xfoil predictionDetails
   s820-nr100,000939.3 at α=9°Mach=0 Ncrit=9Xfoil predictionDetails
   s820-nr100,000537 at α=8.25°Mach=0 Ncrit=5Xfoil predictionDetails
   s820-nr200,000965.4 at α=7.75°Mach=0 Ncrit=9Xfoil predictionDetails
   s820-nr200,000565.9 at α=6.5°Mach=0 Ncrit=5Xfoil predictionDetails
   s820-nr500,0009105.3 at α=6.25°Mach=0 Ncrit=9Xfoil predictionDetails
   s820-nr500,000595.1 at α=5°Mach=0 Ncrit=5Xfoil predictionDetails
   s820-nr1,000,0009129.5 at α=5.25°Mach=0 Ncrit=9Xfoil predictionDetails
   s820-nr1,000,0005109.8 at α=3.75°Mach=0 Ncrit=5Xfoil predictionDetails
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