Airfoil Data
DEFCND3

The DEFIANT CANARD BL145 AIRFOIL is a 8.1% chord-thickness airfoil with a maximum camber of 4.1% at 29% chord, suited to general-aviation and UAV wing design. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -4.1°.

Thin airfoil theory predicts a stall angle near 11.8° and a peak lift-to-drag ratio around 58 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 DEFCND3 typically compare it against profiles of similar thickness: RAF 31 AIRFOIL, GOE 335 (D.F.W.) AIRFOIL, BE50 (original), GOE 315 (HANSA-BRANDENBURG III.5) AIRFOIL, GOE 144 (MVA H.21) AIRFOIL. The S4062-095-87 is another reference profile frequently considered alongside it.