Airfoil Comparison
Select airfoils from the airfoil database or add your own airfoils and compare the airfoil shape and lift/drag polars.
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(ag25-il) AG25 Bubble Dancer DLG by Mark Drela | Drela AG25 airfoil used on the Bubble Dancer R/C DLG Max thickness 7.6% at 24.7% chord Max camber 2.4% at 45.4% chord | Remove Airfoil details Airfoil plotter |
(s831-nr) NREL's S831 Airfoil | NREL HAWT airfoil S831 tip 18.0% Dia=40 to 50 m Re=3.5E+6 Clmax(S)=1.50 Clmax(R)=1.48 High max lift coef Max thickness 18% at 44.2% chord Max camber 5% at 53.1% chord | Remove Airfoil details Airfoil plotter |
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Polars for (ag25-il,s831-nr)
| Plot | Airfoil | Reynolds # | Ncrit | Max Cl/Cd | Description | Source | |
|---|---|---|---|---|---|---|---|
| ag25-il | 50,000 | 9 | 35.9 at α=5.5° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| ag25-il | 50,000 | 5 | 38.9 at α=5.25° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| ag25-il | 100,000 | 9 | 53.6 at α=4.75° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| ag25-il | 100,000 | 5 | 53.1 at α=4.75° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| ag25-il | 200,000 | 9 | 70.9 at α=4° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| ag25-il | 200,000 | 5 | 66.6 at α=4.5° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| ag25-il | 500,000 | 9 | 92.1 at α=4° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| ag25-il | 500,000 | 5 | 84 at α=4.5° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| ag25-il | 1,000,000 | 9 | 106.5 at α=4° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| ag25-il | 1,000,000 | 5 | 97 at α=4.5° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| s831-nr | 50,000 | 9 | 17.2 at α=13.75° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| s831-nr | 50,000 | 5 | 14.2 at α=13.75° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| s831-nr | 100,000 | 9 | 21.8 at α=13° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| s831-nr | 100,000 | 5 | 21.2 at α=12.25° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| s831-nr | 200,000 | 9 | 36.7 at α=11.5° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| s831-nr | 200,000 | 5 | 47 at α=3.5° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| s831-nr | 500,000 | 9 | 113.9 at α=7.75° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| s831-nr | 500,000 | 5 | 112.6 at α=6.25° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
| s831-nr | 1,000,000 | 9 | 152.7 at α=6.5° | Mach=0 Ncrit=9 | Xfoil prediction | Details | |
| s831-nr | 1,000,000 | 5 | 147.5 at α=5° | Mach=0 Ncrit=5 | Xfoil prediction | Details | |
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