Airfoil Data
EIFFEL428

The Eiffel 428 (Bleriot) is a 9.5% chord-thickness airfoil with a maximum camber of 4.8% 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 -4.8°.

Thin airfoil theory predicts a stall angle near 11.7° and a peak lift-to-drag ratio around 62 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 EIFFEL428 typically compare it against profiles of similar thickness: GOE 407 AIRFOIL, GOE 395 AIRFOIL, S4310, MRC20-846, TsAGI R-3a (12%). The RAE 2822 AIRFOIL is another reference profile frequently considered alongside it.