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NREL's S821 Airfoil (s821-nr)

NREL's S821 Airfoil - NREL HAWT airfoil S821 root 24.0% Dia=10 to 20 m Re=8.0E+5 Clmax(S)=1.40 Clmax(R)=1.35 Restrained max lift coef


Airfoil s821-nr
Details Dat file Parser  
(s821-nr) NREL's S821 Airfoil
NREL HAWT airfoil S821 root 24.0% Dia=10 to 20 m Re=8.0E+5 Clmax(S)=1.40 Clmax(R)=1.35 Restrained max lift coef
Max thickness 24.2% at 24.6% chord.
Max camber 2.6% at 77.6% chord
Source NWTC National WInd Technology Center
Source dat file
The dat file is in Selig format
NREL's S821 Airfoil
   x/c        y/c
1.000000   0.000000
0.996211   0.000979
0.985369   0.004273
0.968663   0.009953
0.947175   0.017397
0.921468   0.025654
0.891519   0.033883
0.857009   0.041987
0.818334   0.050225
0.776090   0.058556
0.730890   0.066851
0.683359   0.074932
0.634121   0.082589
0.583790   0.089594
0.532956   0.095710
0.482180   0.100704
0.431988   0.104359
0.382867   0.106477
0.335265   0.106891
0.289592   0.105457
0.246159   0.101964
0.204936   0.096534
0.166314   0.089543
0.130747   0.081197
0.098642   0.071677
0.070407   0.061141
0.046352   0.049758
0.026874   0.037691
0.012130   0.025117
0.004030   0.014909
0.002683   0.012510
0.002318   0.011776
0.001068   0.008667
0.000364   0.005418
0.000040   0.001941
0.000007  -0.000841
0.002499  -0.016695
0.008996  -0.034096
0.018943  -0.052456
0.031877  -0.070873
0.047652  -0.088744
0.065953  -0.105342
0.086614  -0.119982
0.109606  -0.131602
0.135542  -0.139985
0.164146  -0.144525
0.196445  -0.145040
0.232413  -0.142078
0.271925  -0.135855
0.314875  -0.126633
0.361129  -0.114780
0.410491  -0.100789
0.462665  -0.085271
0.517218  -0.068945
0.573551  -0.052597
0.630881  -0.037031
0.688228  -0.023015
0.744435  -0.011208
0.798205  -0.002094
0.848154   0.004073
0.892896   0.007306
0.931134   0.007903
0.961748   0.006400
0.983628   0.003499
0.996079   0.000922
1.000000   0.000000
Dat file parser warnings
  • Line 2 - Invalid characters : x/c y/c
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Polars for NREL's S821 Airfoil (s821-nr)

PlotAirfoilReynolds #NcritMax Cl/CdDescriptionSource 
   s821-nr50,00094.8 at α=11.25°Mach=0 Ncrit=9Xfoil predictionDetails
   s821-nr50,000519.4 at α=9.25°Mach=0 Ncrit=5Xfoil predictionDetails
   s821-nr100,000935.6 at α=9°Mach=0 Ncrit=9Xfoil predictionDetails
   s821-nr100,000537.4 at α=8.25°Mach=0 Ncrit=5Xfoil predictionDetails
   s821-nr200,000952.8 at α=8.25°Mach=0 Ncrit=9Xfoil predictionDetails
   s821-nr200,000551.1 at α=7.5°Mach=0 Ncrit=5Xfoil predictionDetails
   s821-nr500,000972.8 at α=7.5°Mach=0 Ncrit=9Xfoil predictionDetails
   s821-nr500,000566 at α=6.25°Mach=0 Ncrit=5Xfoil predictionDetails
   s821-nr1,000,000987.5 at α=6.5°Mach=0 Ncrit=9Xfoil predictionDetails
   s821-nr1,000,000575.6 at α=5.5°Mach=0 Ncrit=5Xfoil predictionDetails
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