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Your Reynold number range is 50,000 to 1,000,000. (set)

Airfoil Comparison

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Airfoil comparison (e642-il,e636-il,e664-il,e668-il,e662-il,e654-il)
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    (e642-il) EPPLER 642 AIRFOIL

Eppler E642 sailplane airfoil
Max thickness 15.1% at 39.4% chord
Max camber 3% at 39.4% chord
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    (e636-il) EPPLER 636 AIRFOIL

Eppler E636 airfoil
Max thickness 11.9% at 26.9% chord
Max camber 3.2% at 22.9% chord
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    (e664-il) EPPLER 664 AIRFOIL

Eppler E664 variable geometry sailplane airfoil
Max thickness 16.6% at 45.6% chord
Max camber 2.6% at 40.7% chord
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    (e668-il) EPPLER 668 AIRFOIL

Eppler E668 sailplane airfoil
Max thickness 13.9% at 37.3% chord
Max camber 4% at 47.8% chord
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    (e662-il) EPPLER E662 AIRFOIL

Eppler E662 sailplane airfoil
Max thickness 15% at 42.8% chord
Max camber 4.1% at 47.5% chord
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    (e654-il) EPPLER 654 AIRFOIL

Eppler E654 sailplane airfoil
Max thickness 17.2% at 36.1% chord
Max camber 4.9% at 46.5% chord
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Used for printing plan. A4 landscape approx 280mm
Used for printing plan. A4 landscape approx 180mm

Polars for (e642-il,e636-il,e664-il,e668-il,e662-il,e654-il)

PlotAirfoilReynolds #NcritMax Cl/CdDescriptionSource 
   e642-il50,000921.9 at α=12.5°Mach=0 Ncrit=9Xfoil predictionDetails
   e642-il50,000519.2 at α=12.25°Mach=0 Ncrit=5Xfoil predictionDetails
   e642-il100,000943.7 at α=10.25°Mach=0 Ncrit=9Xfoil predictionDetails
   e642-il100,000543 at α=6.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e642-il200,000977.1 at α=8°Mach=0 Ncrit=9Xfoil predictionDetails
   e642-il200,000565.4 at α=7.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e642-il500,000998.2 at α=7.5°Mach=0 Ncrit=9Xfoil predictionDetails
   e642-il500,000592.6 at α=6°Mach=0 Ncrit=5Xfoil predictionDetails
   e642-il1,000,0009121.4 at α=6°Mach=0 Ncrit=9Xfoil predictionDetails
   e642-il1,000,0005109.7 at α=5°Mach=0 Ncrit=5Xfoil predictionDetails
   e636-il50,000914.7 at α=1.25°Mach=0 Ncrit=9Xfoil predictionDetails
   e636-il50,000524.6 at α=5°Mach=0 Ncrit=5Xfoil predictionDetails
   e636-il100,000933 at α=13°Mach=0 Ncrit=9Xfoil predictionDetails
   e636-il100,000544 at α=8.25°Mach=0 Ncrit=5Xfoil predictionDetails
   e636-il200,000961.7 at α=10.75°Mach=0 Ncrit=9Xfoil predictionDetails
   e636-il200,000565.8 at α=9°Mach=0 Ncrit=5Xfoil predictionDetails
   e636-il500,000995.6 at α=9.25°Mach=0 Ncrit=9Xfoil predictionDetails
   e636-il500,000594.8 at α=8.5°Mach=0 Ncrit=5Xfoil predictionDetails
   e636-il1,000,0009120.7 at α=8.5°Mach=0 Ncrit=9Xfoil predictionDetails
   e636-il1,000,0005108.3 at α=8.25°Mach=0 Ncrit=5Xfoil predictionDetails
   e664-il50,000919.3 at α=12°Mach=0 Ncrit=9Xfoil predictionDetails
   e664-il50,000519.7 at α=12°Mach=0 Ncrit=5Xfoil predictionDetails
   e664-il100,000939.9 at α=10°Mach=0 Ncrit=9Xfoil predictionDetails
   e664-il100,000533.2 at α=9.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e664-il200,000957.6 at α=8.75°Mach=0 Ncrit=9Xfoil predictionDetails
   e664-il200,000558.3 at α=7.25°Mach=0 Ncrit=5Xfoil predictionDetails
   e664-il500,000990.8 at α=6.5°Mach=0 Ncrit=9Xfoil predictionDetails
   e664-il500,000590.9 at α=5°Mach=0 Ncrit=5Xfoil predictionDetails
   e664-il1,000,0009120.9 at α=5.25°Mach=0 Ncrit=9Xfoil predictionDetails
   e664-il1,000,0005111.2 at α=3.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e668-il50,000931 at α=10.5°Mach=0 Ncrit=9Xfoil predictionDetails
   e668-il50,000527 at α=9.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e668-il100,000951.6 at α=8.75°Mach=0 Ncrit=9Xfoil predictionDetails
   e668-il100,000547.2 at α=8°Mach=0 Ncrit=5Xfoil predictionDetails
   e668-il200,000981.1 at α=7.25°Mach=0 Ncrit=9Xfoil predictionDetails
   e668-il200,000577.2 at α=6.25°Mach=0 Ncrit=5Xfoil predictionDetails
   e668-il500,0009123 at α=5.25°Mach=0 Ncrit=9Xfoil predictionDetails
   e668-il500,0005113.2 at α=3.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e668-il1,000,0009155.5 at α=4°Mach=0 Ncrit=9Xfoil predictionDetails
   e668-il1,000,0005135.8 at α=2.25°Mach=0 Ncrit=5Xfoil predictionDetails
   e662-il50,000927.6 at α=12°Mach=0 Ncrit=9Xfoil predictionDetails
   e662-il50,000523.4 at α=11°Mach=0 Ncrit=5Xfoil predictionDetails
   e662-il100,000946.6 at α=9.5°Mach=0 Ncrit=9Xfoil predictionDetails
   e662-il100,000540.9 at α=9°Mach=0 Ncrit=5Xfoil predictionDetails
   e662-il200,000971.4 at α=8°Mach=0 Ncrit=9Xfoil predictionDetails
   e662-il200,000566.9 at α=6.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e662-il500,0009114.3 at α=5.75°Mach=0 Ncrit=9Xfoil predictionDetails
   e662-il500,0005111.1 at α=4°Mach=0 Ncrit=5Xfoil predictionDetails
   e662-il1,000,0009152 at α=4.5°Mach=0 Ncrit=9Xfoil predictionDetails
   e662-il1,000,0005138.7 at α=2.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e654-il50,00095.1 at α=10°Mach=0 Ncrit=9Xfoil predictionDetails
   e654-il50,000512.8 at α=12.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e654-il100,000932.7 at α=12.75°Mach=0 Ncrit=9Xfoil predictionDetails
   e654-il100,000528.3 at α=10.75°Mach=0 Ncrit=5Xfoil predictionDetails
   e654-il200,000970.6 at α=9°Mach=0 Ncrit=9Xfoil predictionDetails
   e654-il200,000571.4 at α=7.25°Mach=0 Ncrit=5Xfoil predictionDetails
   e654-il500,0009122.5 at α=7.5°Mach=0 Ncrit=9Xfoil predictionDetails
   e654-il500,0005118 at α=6°Mach=0 Ncrit=5Xfoil predictionDetails
   e654-il1,000,0009158.6 at α=6.25°Mach=0 Ncrit=9Xfoil predictionDetails
   e654-il1,000,0005145.4 at α=4.75°Mach=0 Ncrit=5Xfoil predictionDetails
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