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NREL's S821 Airfoil (s821-nr) Xfoil prediction polar at RE=500,000 Ncrit=9


Details Polar file
Airfoil: NREL's S821 Airfoil (s821-nr)
Reynolds number: 500,000
Max Cl/Cd: 72.85 at α=7.5°
Description: Mach=0 Ncrit=9
Source: Xfoil prediction
Download polar: xf-s821-nr-500000.txt
Download as CSV file: xf-s821-nr-500000.csv

  
       XFOIL         Version 6.96
  
 Calculated polar for: NREL's S821 Airfoil                             
  
 1 1 Reynolds number fixed          Mach number fixed         
  
 xtrf =   1.000 (top)        1.000 (bottom)  
 Mach =   0.000     Re =     0.500 e 6     Ncrit =   9.000
  
   alpha    CL        CD       CDp       CM     Top_Xtr  Bot_Xtr
  ------ -------- --------- --------- -------- -------- --------
 -11.000  -0.3059   0.13949   0.13599  -0.0228   1.0000   0.1707
 -10.750  -0.9694   0.04068   0.03575  -0.0679   0.9913   0.2053
 -10.500  -0.9766   0.03632   0.03121  -0.0734   0.9842   0.2063
 -10.250  -0.9681   0.03319   0.02795  -0.0780   0.9789   0.2075
 -10.000  -0.9390   0.03194   0.02669  -0.0812   0.9767   0.2086
  -9.750  -0.9049   0.03113   0.02589  -0.0846   0.9753   0.2094
  -9.500  -0.8960   0.02993   0.02468  -0.0842   0.9664   0.2101
  -9.250  -0.8681   0.02891   0.02365  -0.0869   0.9629   0.2109
  -9.000  -0.8366   0.02790   0.02263  -0.0904   0.9605   0.2118
  -8.750  -0.8274   0.02657   0.02126  -0.0905   0.9515   0.2125
  -8.500  -0.7976   0.02533   0.01998  -0.0938   0.9473   0.2134
  -8.250  -0.7619   0.02415   0.01876  -0.0980   0.9449   0.2144
  -8.000  -0.7237   0.02308   0.01764  -0.1025   0.9432   0.2156
  -7.750  -0.7107   0.02217   0.01667  -0.1019   0.9328   0.2164
  -7.500  -0.6757   0.02138   0.01582  -0.1047   0.9298   0.2174
  -7.250  -0.6379   0.02065   0.01504  -0.1078   0.9278   0.2182
  -7.000  -0.5987   0.02000   0.01434  -0.1109   0.9263   0.2188
  -6.750  -0.5830   0.01946   0.01375  -0.1095   0.9154   0.2192
  -6.500  -0.5502   0.01843   0.01274  -0.1113   0.9122   0.2207
  -6.250  -0.5141   0.01776   0.01210  -0.1132   0.9098   0.2219
  -6.000  -0.4927   0.01727   0.01162  -0.1125   0.8999   0.2228
  -5.750  -0.4579   0.01677   0.01113  -0.1141   0.8945   0.2237
  -5.500  -0.4152   0.01628   0.01064  -0.1172   0.8911   0.2248
  -5.250  -0.3838   0.01588   0.01024  -0.1182   0.8809   0.2258
  -5.000  -0.3362   0.01546   0.00981  -0.1222   0.8749   0.2271
  -4.750  -0.2897   0.01510   0.00941  -0.1261   0.8664   0.2285
  -4.500  -0.2456   0.01475   0.00900  -0.1295   0.8547   0.2298
  -4.250  -0.2079   0.01447   0.00864  -0.1316   0.8402   0.2309
  -4.000  -0.1721   0.01425   0.00831  -0.1334   0.8245   0.2318
  -3.500  -0.1128   0.01371   0.00762  -0.1344   0.7917   0.2340
  -3.250  -0.0852   0.01347   0.00736  -0.1345   0.7766   0.2355
  -3.000  -0.0570   0.01334   0.00717  -0.1346   0.7616   0.2367
  -2.750  -0.0302   0.01321   0.00701  -0.1345   0.7465   0.2379
  -2.500  -0.0028   0.01312   0.00687  -0.1344   0.7326   0.2392
  -2.250   0.0247   0.01304   0.00674  -0.1344   0.7188   0.2405
  -2.000   0.0521   0.01295   0.00662  -0.1343   0.7063   0.2420
  -1.500   0.1076   0.01283   0.00638  -0.1341   0.6816   0.2449
  -1.250   0.1355   0.01281   0.00626  -0.1340   0.6693   0.2460
  -1.000   0.1630   0.01267   0.00610  -0.1339   0.6575   0.2473
  -0.750   0.1904   0.01251   0.00592  -0.1338   0.6460   0.2495
  -0.500   0.2185   0.01239   0.00584  -0.1338   0.6355   0.2513
  -0.250   0.2464   0.01237   0.00578  -0.1337   0.6247   0.2531
   0.000   0.2748   0.01232   0.00573  -0.1337   0.6147   0.2549
   0.250   0.3027   0.01231   0.00568  -0.1335   0.6040   0.2568
   0.500   0.3311   0.01230   0.00564  -0.1334   0.5941   0.2587
   0.750   0.3594   0.01230   0.00561  -0.1333   0.5842   0.2605
   1.000   0.3877   0.01230   0.00555  -0.1332   0.5750   0.2627
   1.250   0.4164   0.01217   0.00549  -0.1333   0.5658   0.2658
   1.500   0.4444   0.01219   0.00550  -0.1331   0.5563   0.2683
   1.750   0.4731   0.01220   0.00552  -0.1330   0.5479   0.2708
   2.000   0.5014   0.01222   0.00553  -0.1328   0.5391   0.2734
   2.250   0.5292   0.01232   0.00556  -0.1326   0.5298   0.2759
   2.500   0.5573   0.01229   0.00555  -0.1323   0.5205   0.2784
   2.750   0.5847   0.01229   0.00555  -0.1321   0.5106   0.2821
   3.000   0.6128   0.01230   0.00560  -0.1318   0.5016   0.2853
   3.250   0.6399   0.01236   0.00565  -0.1314   0.4919   0.2886
   3.500   0.6670   0.01247   0.00572  -0.1310   0.4831   0.2917
   3.750   0.6946   0.01251   0.00577  -0.1306   0.4744   0.2945
   4.000   0.7214   0.01256   0.00583  -0.1302   0.4652   0.2992
   4.250   0.7489   0.01260   0.00592  -0.1298   0.4566   0.3033
   4.500   0.7751   0.01270   0.00601  -0.1291   0.4474   0.3071
   4.750   0.8012   0.01284   0.00612  -0.1284   0.4392   0.3104
   5.000   0.8281   0.01286   0.00619  -0.1280   0.4306   0.3146
   5.250   0.8524   0.01299   0.00631  -0.1270   0.4217   0.3189
   5.500   0.8783   0.01306   0.00644  -0.1263   0.4135   0.3231
   5.750   0.9020   0.01320   0.00655  -0.1252   0.4041   0.3270
   6.000   0.9257   0.01336   0.00670  -0.1240   0.3953   0.3301
   6.250   0.9504   0.01343   0.00682  -0.1232   0.3852   0.3356
   6.500   0.9734   0.01361   0.00702  -0.1220   0.3752   0.3402
   6.750   0.9967   0.01380   0.00720  -0.1208   0.3636   0.3447
   7.000   1.0193   0.01404   0.00742  -0.1195   0.3516   0.3487
   7.250   1.0404   0.01431   0.00766  -0.1181   0.3374   0.3538
   7.500   1.0621   0.01458   0.00793  -0.1168   0.3211   0.3587
   7.750   1.0819   0.01494   0.00825  -0.1151   0.3022   0.3634
   8.000   1.0992   0.01542   0.00861  -0.1132   0.2791   0.3675
   8.250   1.1148   0.01599   0.00905  -0.1110   0.2523   0.3715
   8.500   1.1282   0.01668   0.00963  -0.1087   0.2270   0.3767
   8.750   1.1429   0.01734   0.01021  -0.1065   0.2055   0.3817
   9.000   1.1568   0.01804   0.01082  -0.1043   0.1871   0.3865
   9.250   1.1706   0.01875   0.01144  -0.1020   0.1716   0.3906
   9.500   1.1854   0.01942   0.01209  -0.1001   0.1578   0.3963
   9.750   1.1991   0.02015   0.01280  -0.0980   0.1459   0.4018
  10.000   1.2125   0.02092   0.01353  -0.0959   0.1355   0.4071
  10.250   1.2245   0.02177   0.01433  -0.0937   0.1261   0.4117
  10.500   1.2379   0.02257   0.01512  -0.0919   0.1176   0.4175
  10.750   1.2510   0.02340   0.01600  -0.0900   0.1103   0.4234
  11.000   1.2623   0.02437   0.01695  -0.0880   0.1038   0.4292
  11.250   1.2732   0.02539   0.01796  -0.0861   0.0977   0.4342
  11.500   1.2849   0.02640   0.01900  -0.0844   0.0923   0.4399
  11.750   1.2938   0.02764   0.02026  -0.0826   0.0874   0.4460
  12.000   1.3056   0.02873   0.02140  -0.0811   0.0828   0.4523
  12.250   1.3133   0.03014   0.02281  -0.0794   0.0789   0.4577
  12.500   1.3238   0.03144   0.02415  -0.0781   0.0749   0.4639
  12.750   1.3312   0.03301   0.02578  -0.0767   0.0714   0.4701
  13.000   1.3405   0.03450   0.02731  -0.0756   0.0679   0.4768
  13.250   1.3458   0.03637   0.02919  -0.0743   0.0649   0.4824
  13.500   1.3549   0.03802   0.03093  -0.0735   0.0618   0.4895
  13.750   1.3589   0.04018   0.03312  -0.0726   0.0590   0.4960
  14.000   1.3674   0.04200   0.03501  -0.0718   0.0562   0.5030
  14.250   1.3710   0.04434   0.03738  -0.0712   0.0538   0.5088
  14.500   1.3769   0.04657   0.03971  -0.0708   0.0514   0.5164
  14.750   1.3809   0.04904   0.04223  -0.0704   0.0491   0.5239
  15.000   1.3834   0.05174   0.04497  -0.0701   0.0471   0.5307
  15.250   1.3878   0.05435   0.04768  -0.0701   0.0450   0.5385
  15.500   1.3881   0.05748   0.05087  -0.0702   0.0433   0.5459
  15.750   1.3909   0.06039   0.05385  -0.0703   0.0415   0.5534
  16.000   1.3933   0.06346   0.05701  -0.0707   0.0398   0.5615
  16.250   1.3912   0.06717   0.06079  -0.0713   0.0385   0.5695
  16.500   1.3926   0.07050   0.06420  -0.0718   0.0371   0.5780
  16.750   1.3941   0.07392   0.06774  -0.0725   0.0357   0.5871
  17.000   1.3920   0.07789   0.07178  -0.0735   0.0346   0.5960
  17.250   1.3886   0.08213   0.07610  -0.0747   0.0336   0.6042
  17.500   1.3903   0.08572   0.07981  -0.0757   0.0325   0.6149
  17.750   1.3896   0.08971   0.08389  -0.0769   0.0315   0.6251
  18.000   1.3865   0.09411   0.08839  -0.0785   0.0307   0.6359
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