Airfoil Data
AH81K144WFKLAPPE

The AH 81-K-144 W-F KLAPPE is a 11.9% chord-thickness airfoil with a maximum camber of 5.9% at 17% 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 -5.9°.

Thin airfoil theory predicts a stall angle near 11.6° and a peak lift-to-drag ratio around 69 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 12% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the AH81K144WFKLAPPE typically compare it against profiles of similar thickness: Rhode St. Genese 32, CLARK YH AIRFOIL, GOE 364 AIRFOIL, FX 78-K-150/20, GOE 14 AIRFOIL. The AS6093 | Ananda-Selig | AIAA Paper 2018-0310 is another reference profile frequently considered alongside it.