Airfoil Data
C141B

The LOCKHEED C-141 BL113.6 AIRFOIL is a thin 7.3% chord-thickness airfoil with a maximum camber of 3.7% 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 -3.7°.

Thin airfoil theory predicts a stall angle near 11.8° and a peak lift-to-drag ratio around 56 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 C141B typically compare it against profiles of similar thickness: NACA 66,2-(1.8)12 A=.6 P-51 TIP AIRFOIL, EPPLER E852 AIRFOIL, S4083 (8%), NASA/LANGLEY RC-12(N)1 AIRFOIL, S4094 (root airfoil designed for and used on the E-flite UMX ASK-21 scale RC sailplane). The BOEING AIRFOIL J is another reference profile frequently considered alongside it.