Airfoil Data
E423

The E423 is a thick 15.8% chord-thickness airfoil with a maximum camber of 7.9% at 40% 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 -7.9°.

Thin airfoil theory predicts a stall angle near 10.3° and a peak lift-to-drag ratio around 74 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 16% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the E423 typically compare it against profiles of similar thickness: NACA 4424, USA 32 AIRFOIL, FX 74-Cl5-140 MOD (smoothed), GOE 382 AIRFOIL, RONCZ 1046 VOYAGER CANARD AIRFOIL. The LA2573A is another reference profile frequently considered alongside it.