Airfoil Data
GS1

The SIKORSKY GS-1 AIRFOIL is a 10.7% chord-thickness airfoil with a maximum camber of 5.3% 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 -5.3°.

Thin airfoil theory predicts a stall angle near 11.7° and a peak lift-to-drag ratio around 65 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 GS1 typically compare it against profiles of similar thickness: GOE 304 (FRIEDRICHSHAFEN G02) AIRFOIL, EPPLER 642 AIRFOIL, EPPLER 562 AIRFOIL, MH 82 13.31%, EPPLER 547 AIRFOIL. The NACA 63(2)A-015 is another reference profile frequently considered alongside it.