Airfoil Data
E377M

The EPPLER 377 (MODIFIED) AIRFOIL is a 9.4% chord-thickness airfoil with a maximum camber of 4.7% at 33% 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 -4.7°.

Thin airfoil theory predicts a stall angle near 11.7° and a peak lift-to-drag ratio around 62 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 E377M typically compare it against profiles of similar thickness: EPPLER 377 AIRFOIL, BOEING-VERTOL VR-5 AIRFOIL, EPPLER 333 AIRFOIL, NACA 2415, NACA 2415. The S7055 (10.5%) Flat-Bottomed is another reference profile frequently considered alongside it.