Airfoil Data
K3311SM

The K3311 (smoothed) is a 8.7% chord-thickness airfoil with a maximum camber of 4.3% at 34% 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 -4.3°.

Thin airfoil theory predicts a stall angle near 11.8° and a peak lift-to-drag ratio around 60 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 K3311SM typically compare it against profiles of similar thickness: GOE 310 (MVA H.42) AIRFOIL, GOE 177 AIRFOIL, SIKORSKY SC1012R8 AIRFOIL, GOE 178 AIRFOIL, GOE 155 (SSW D.1) AIRFOIL. The GOE 363 AIRFOIL is another reference profile frequently considered alongside it.