Airfoil Data
EIFFEL430

The Eiffel 430 (Lachassgne) is a 11.0% chord-thickness airfoil with a maximum camber of 5.5% at 40% 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 -5.5°.

Thin airfoil theory predicts a stall angle near 11.7° and a peak lift-to-drag ratio around 66 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 11% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the EIFFEL430 typically compare it against profiles of similar thickness: RAF 32 AIRFOIL, GOE 532 AIRFOIL, RONCZ 1082T VOYAGER TIP OUTER AFT WING AIRFOIL, RAF 33 AIRFOIL, USNPS4 (smoothed). The AG23 XC Bubble Dancer Root Airfoil is another reference profile frequently considered alongside it.