Airfoil Data
E374

The E374 is a thin 7.7% chord-thickness airfoil with a maximum camber of 3.8% at 39% 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 -3.8°.

Thin airfoil theory predicts a stall angle near 11.8° and a peak lift-to-drag ratio around 57 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.

The E374 appears in the wing design of at least 5 documented aircraft — notably by Tasuma. Its proven track record across canard designs makes it one of the more field-validated profiles in the UIUC database.

Designers evaluating the E374 typically compare it against profiles of similar thickness: E477, EPPLER 59 AIRFOIL, SA7038, Coanda 3, EPPLER 361 AIRFOIL. The LISSAMAN 7769 AIRFOIL is another reference profile frequently considered alongside it.