Airfoil Data
E435

The EPPLER 435 AIRFOIL is a 12.3% chord-thickness airfoil with a maximum camber of 6.2% at 43% 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 -6.2°.

Thin airfoil theory predicts a stall angle near 11.5° and a peak lift-to-drag ratio around 69 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 E435 typically compare it against profiles of similar thickness: FX 66-S-171 AIRFOIL, NACA M26 AIRFOIL, EPPLER 1230 AIRFOIL, DAI 1336, NACA M24 AIRFOIL. The M6 (85%) is another reference profile frequently considered alongside it.