Airfoil Data
RAF25

The RAF 25 AIRFOIL is a thin 4.2% chord-thickness airfoil with a maximum camber of 2.1% at 40% 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 -2.1°.

Thin airfoil theory predicts a stall angle near 12.0° and a peak lift-to-drag ratio around 47 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 RAF25 appears in the wing design of at least 2 documented aircraft — notably by Gloster. Its proven track record across canard designs makes it one of the more field-validated profiles in the UIUC database.

Designers evaluating the RAF25 typically compare it against profiles of similar thickness: AG09, GOE 598 AIRFOIL, NACA 66-206, NACA 65-206, NACA 64-206. The GIII BL167 AIRFOIL is another reference profile frequently considered alongside it.