Airfoil Data
S3021

The S3021-095-84 is a thin 7.6% chord-thickness airfoil with a maximum camber of 3.8% at 35% 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.

Designers evaluating the S3021 typically compare it against profiles of similar thickness: MH 122 9.32%, WORTMANN FX L V-152 AIRFOIL, GOE 210 (DAIMLER) AIRFOIL, EPPLER 360 AIRFOIL, USA 41 AIRFOIL. The DF102 is another reference profile frequently considered alongside it.