Airfoil Data
S9033

The S9033 (7.5%) is a thin 3.7% chord-thickness airfoil with a maximum camber of 1.9% at 23% 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 -1.9°.

Thin airfoil theory predicts a stall angle near 12.0° and a peak lift-to-drag ratio around 46 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 S9033 typically compare it against profiles of similar thickness: HT35, HT 14, AG47ct -02f rot., ONERA OA206 AIRFOIL, S8023 (7.6%). The YS-920 is another reference profile frequently considered alongside it.