Airfoil Data
FX78PK188

The FX 78-PK-188/20 is a 11.8% chord-thickness airfoil with a maximum camber of 5.9% at 47% chord, suited to transonic and supercritical wing sections where aft-camber reduces wave drag. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -5.9°.

Thin airfoil theory predicts a stall angle near 11.6° and a peak lift-to-drag ratio around 68 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 FX78PK188 typically compare it against profiles of similar thickness: EPPLER E1212 AIRFOIL, DU 80-176 V1, FX 84-W-150, EPPLER 344 AIRFOIL, GOE 414 AIRFOIL. The FX 78-K-161 is another reference profile frequently considered alongside it.