Airfoil Data
E837

The EPPLER E837 HYDROFOIL AIRFOIL is a 8.1% chord-thickness airfoil with a maximum camber of 4.0% at 37% 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 -4.0°.

Thin airfoil theory predicts a stall angle near 11.8° and a peak lift-to-drag ratio around 58 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 E837 typically compare it against profiles of similar thickness: GOE 410 AIRFOIL, GOE 673 AIRFOIL, GOE 495 AIRFOIL, NACA 63-412 AIRFOIL, AH 79-100 A AIRFOIL. The EPPLER 407 AIRFOIL is another reference profile frequently considered alongside it.