Airfoil Data
DEFCND1

The DEFIANT CANARD BL20 AIRFOIL is a 14.8% chord-thickness airfoil with a maximum camber of 7.4% at 32% chord, suited to high-lift UAV wings, RC sailplanes, and low-Reynolds-number slow-flyers. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -7.4°.

Thin airfoil theory predicts a stall angle near 10.6° and a peak lift-to-drag ratio around 72 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 15% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the DEFCND1 typically compare it against profiles of similar thickness: GOE 422 AIRFOIL, GOE 229 (MVA H.39) AIRFOIL, GOE 424 AIRFOIL, IST-MT1-15, FX 83-W-227. The Rhode St. Genese 36 is another reference profile frequently considered alongside it.