Airfoil Data
FX78K161

The FX 78-K-161 is a 10.9% chord-thickness airfoil with a maximum camber of 5.5% at 40% chord, suited to general-aviation and UAV wing design. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -5.5°.

Thin airfoil theory predicts a stall angle near 11.7° and a peak lift-to-drag ratio around 66 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 11% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the FX78K161 typically compare it against profiles of similar thickness: EPPLER 395 AIRFOIL, GW 30, GOE 300 (FRIEDRICHSHAFEN G20) AIRFOIL, SG6050, GOE 701 AIRFOIL. The FX 78-K-140/20 is another reference profile frequently considered alongside it.