Airfoil Data
CLARKYH

The CLARK YH AIRFOIL is a 11.9% chord-thickness airfoil with a maximum camber of 5.9% at 30% 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.

The CLARKYH appears in the wing design of at least 121 documented aircraft, including designs from Yakovlev and Potez. Its proven track record across conventional and rotorcraft designs makes it one of the more field-validated profiles in the UIUC database.

Designers evaluating the CLARKYH typically compare it against profiles of similar thickness: Rhode St. Genese 32, AH 81-K-144 W-F KLAPPE, GOE 364 AIRFOIL, FX 78-K-150/20, GOE 14 AIRFOIL. The E10(08%) is another reference profile frequently considered alongside it.