Airfoil Data
L7769

The LISSAMAN 7769 AIRFOIL is a 9.9% chord-thickness airfoil with a maximum camber of 5.0% 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 -5.0°.

Thin airfoil theory predicts a stall angle near 11.7° and a peak lift-to-drag ratio around 63 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.

The L7769 appears in the wing design of at least 11 documented aircraft, including designs from Team and MIT. 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 L7769 typically compare it against profiles of similar thickness: GOE 746 AIRFOIL, EPPLER 341 AIRFOIL, EPPLER 541 AIRFOIL, GOE 92 AIRFOIL, MB253515 15.0% smoothed. The Dormoy is another reference profile frequently considered alongside it.