Airfoil Data
E654

The EPPLER 654 AIRFOIL is a 13.4% chord-thickness airfoil with a maximum camber of 6.7% at 42% 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 -6.7°.

Thin airfoil theory predicts a stall angle near 11.1° and a peak lift-to-drag ratio around 71 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 13% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the E654 typically compare it against profiles of similar thickness: UAG 88-143/20, AUGUST 160, GOE 647 AIRFOIL, FX 73-CL1-152, GOE 562 AIRFOIL. The Davis AIRFOIL is another reference profile frequently considered alongside it.