Airfoil Data
C141C

The LOCKHEED C-141 BL426.57 AIRFOIL is a thin 6.8% chord-thickness airfoil with a maximum camber of 3.4% at 40% chord, suited to high-speed UAVs, sailplane tip sections, and propeller blade design. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -3.4°.

Thin airfoil theory predicts a stall angle near 11.9° and a peak lift-to-drag ratio around 54 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 C141C typically compare it against profiles of similar thickness: NPL 9626 AIRFOIL, HUGHES HELICOPTERS HH-02 AIRFOIL, LOCKHEED C-5A BL488.2 AIRFOIL, BOEING BACXXX AIRFOIL, GOE 235 (SCHUETTE-LANZ) AIRFOIL. The GOE 535 AIRFOIL is another reference profile frequently considered alongside it.