Airfoil Data
YS915

The YS-915 is a thin 5.8% chord-thickness airfoil with a maximum camber of 2.9% at 51% 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 -2.9°.

Thin airfoil theory predicts a stall angle near 11.9° and a peak lift-to-drag ratio around 52 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 YS915 typically compare it against profiles of similar thickness: EPPLER 904 AIRFOIL, N-13, GOE 587 AIRFOIL, MH 24 9.01%, GIII BL75 AIRFOIL. The AH 93-K-131/15 is another reference profile frequently considered alongside it.