Airfoil Data
E836

The EPPLER E836 HYDROFOIL AIRFOIL is a thin 6.3% chord-thickness airfoil with a maximum camber of 3.2% at 43% chord, suited to high-speed UAVs, sailplane tip sections, and propeller blade design. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -3.2°.

Thin airfoil theory predicts a stall angle near 11.9° and a peak lift-to-drag ratio around 53 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The slim profile minimises pressure drag at higher speeds but leaves limited spar depth for structural integration.

Designers evaluating the E836 typically compare it against profiles of similar thickness: RAF 30 AIRFOIL, GOE 488 AIRFOIL, MH 42 8.94%, MH 44 9.66%, GOE 474 AIRFOIL. The FX 76-120 is another reference profile frequently considered alongside it.