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S1221 w/o flap (s1221-il)

S1221 w/o flap - Selig S1221 airfoil


Airfoil s1221-il
Details Dat file Parser  
(s1221-il) S1221 w/o flap
Selig S1221 airfoil
Max thickness 12.1% at 21.8% chord.
Max camber 4.9% at 49.1% chord
Source UIUC Airfoil Coordinates Database
Source dat file
The dat file is in Selig format
S1221  w/o flap
 1.00182  0.01052 
 1.00010  0.01125 
 0.99539  0.01347 
 0.98834  0.01676 
 0.97911  0.02033 
 0.96725  0.02380 
 0.95255  0.02730 
 0.94744  0.02839 
 0.87368  0.04200 
 0.79952  0.05285 
 0.72514  0.06224 
 0.65074  0.07145 
 0.64181  0.07259 
 0.60457  0.07717 
 0.56677  0.08157 
 0.52865  0.08577 
 0.49051  0.08975 
 0.45264  0.09349 
 0.41537  0.09693 
 0.37902  0.09992 
 0.34385  0.10232 
 0.31005  0.10396 
 0.27776  0.10469 
 0.24715  0.10447 
 0.21836  0.10298 
 0.19125  0.10011 
 0.16569  0.09601 
 0.14166  0.09077 
 0.11918  0.08461 
 0.09838  0.07771 
 0.07937  0.07022 
 0.06223  0.06222 
 0.04705  0.05386 
 0.03388  0.04528 
 0.02281  0.03663 
 0.01391  0.02808 
 0.00733  0.01969 
 0.00297  0.01152 
 0.00065  0.00384 
 0.00037 -0.00287 
 0.00271 -0.00774 
 0.00859 -0.01117 
 0.01809 -0.01422 
 0.03068 -0.01687 
 0.04619 -0.01910 
 0.06442 -0.02087 
 0.08523 -0.02216 
 0.10841 -0.02290 
 0.13379 -0.02304 
 0.16116 -0.02248 
 0.19026 -0.02101 
 0.22124 -0.01814 
 0.25456 -0.01393 
 0.29026 -0.00894 
 0.32811 -0.00346 
 0.36788  0.00227 
 0.40929  0.00802 
 0.45202  0.01360 
 0.49574  0.01880 
 0.54006  0.02346 
 0.58460  0.02742 
 0.62895  0.03058 
 0.65127  0.03183 
 0.72628  0.03528 
 0.80124  0.03663 
 0.87610  0.03380 
 0.95081  0.02472 
 0.96969  0.02084 
 0.98452  0.01668 
 0.99445  0.01326 
 1.00003  0.01119 
 1.00181  0.01052 

Dat file parser warnings
  • Line 2 - X value too large but included: 1.00182 0.01052
  • Line 3 - X value too large but included: 1.00010 0.01125
  • Line 72 - X value too large but included: 1.00003 0.01119
  • Line 73 - X value too large but included: 1.00181 0.01052
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Polars for S1221 w/o flap (s1221-il)

PlotAirfoilReynolds #NcritMax Cl/CdDescriptionSource 
   s1221-il50,000927.1 at α=3.25°Mach=0 Ncrit=9Xfoil predictionDetails
   s1221-il50,000536.6 at α=5°Mach=0 Ncrit=5Xfoil predictionDetails
   s1221-il100,000945.2 at α=3.75°Mach=0 Ncrit=9Xfoil predictionDetails
   s1221-il100,000554.5 at α=6°Mach=0 Ncrit=5Xfoil predictionDetails
   s1221-il200,000970 at α=11.5°Mach=0 Ncrit=9Xfoil predictionDetails
   s1221-il200,000576.5 at α=7.75°Mach=0 Ncrit=5Xfoil predictionDetails
   s1221-il500,0009107.5 at α=9.75°Mach=0 Ncrit=9Xfoil predictionDetails
   s1221-il500,0005110 at α=8.25°Mach=0 Ncrit=5Xfoil predictionDetails
   s1221-il1,000,0009137.9 at α=8.5°Mach=0 Ncrit=9Xfoil predictionDetails
   s1221-il1,000,0005135.1 at α=8°Mach=0 Ncrit=5Xfoil predictionDetails
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