Airfoil Data
FX77W343

The WORTMANN FX 77-W-343 AIRFOIL is a thick 21.8% chord-thickness airfoil with a maximum camber of 10.9% at 31% 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 -10.9°.

Thin airfoil theory predicts a stall angle near 8.2° and a peak lift-to-drag ratio around 81 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 22% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the FX77W343 typically compare it against profiles of similar thickness: KENNEDY AND MARSDEN AIRFOIL, GOE 571 AIRFOIL, GOE 531 AIRFOIL, GOE 561 AIRFOIL, MH 126 25.0%. The WORTMANN FX 77-W-153 AIRFOIL is another reference profile frequently considered alongside it.