Airfoil Data
GOE531

The GOE 531 AIRFOIL is a thick 20.9% chord-thickness airfoil with a maximum camber of 10.4% at 49% 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 -10.4°.

Thin airfoil theory predicts a stall angle near 8.5° and a peak lift-to-drag ratio around 80 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 21% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the GOE531 typically compare it against profiles of similar thickness: KENNEDY AND MARSDEN AIRFOIL, MH 126 25.0%, WORTMANN FX 77-W-343 AIRFOIL, EPPLER 864 STRUT AIRFOIL, GOE 571 AIRFOIL. The GOE 503 AIRFOIL is another reference profile frequently considered alongside it.