Airfoil Data
E559

The EPPLER 559 AIRFOIL is a 11.6% chord-thickness airfoil with a maximum camber of 5.8% at 31% 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 -5.8°.

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 E559 typically compare it against profiles of similar thickness: GOE 769 AIRFOIL, GOE 404 AIRFOIL, AH 93-157, GOE 530 AIRFOIL, EPPLER 396 AIRFOIL. The Apex 16 (normalized using XFOIL date021206) is another reference profile frequently considered alongside it.