Airfoil Data
FX63137SM

The FX 63-137 13.7% smoothed is a 12.2% chord-thickness airfoil with a maximum camber of 6.1% at 37% chord, suited to high-lift UAV wings, RC sailplanes, and low-Reynolds-number slow-flyers. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -6.1°.

Thin airfoil theory predicts a stall angle near 11.5° and a peak lift-to-drag ratio around 69 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 12% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the FX63137SM typically compare it against profiles of similar thickness: GOE 615 AIRFOIL, WORTMANN FX 63-137 AIRFOIL, NACA 64(3)-618, GOE 331 (PFALZ 60) AIRFOIL, GOE 464 AIRFOIL. The MH 104 15.28% is another reference profile frequently considered alongside it.