Airfoil Data
FX84W140

The FX 84-W-140 is a 11.2% chord-thickness airfoil with a maximum camber of 5.6% at 37% 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 -5.6°.

Thin airfoil theory predicts a stall angle near 11.6° and a peak lift-to-drag ratio around 67 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 FX84W140 typically compare it against profiles of similar thickness: FX 63-145 AIRFOIL, GOE 29B AIRFOIL, DAI 1238, NACA 66(3)-418, EPPLER STF 863-615 AIRFOIL. The FX 84-W-218 is another reference profile frequently considered alongside it.