Airfoil Data
E656
EPPLER 656 AIRFOIL
Wing Geometry Simulator
The EPPLER 656 AIRFOIL is a 12.9% chord-thickness airfoil with a maximum camber of 6.4% at 41% 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 -6.4°.
Thin airfoil theory predicts a stall angle near 11.3° and a peak lift-to-drag ratio around 70 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 13% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.
Designers evaluating the E656 typically compare it against profiles of similar thickness: WORTMANN FX 66-17A-175 AIRFOIL, FX 66-17AII-182 AIRFOIL, FX 66-182 AIRFOIL, EPPLER 1210 AIRFOIL, USA 98 AIRFOIL. The 0.018772 0.005079 is another reference profile frequently considered alongside it.
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Related Airfoils
Engineers evaluating the E656 frequently compare it against profiles with comparable geometric constraints. Below are the closest matches based on maximum thickness (12.9%) and max camber (6.4%).
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