Airfoil Data
B707E

The BOEING 707 .99 SPAN AIRFOIL is a thin 6.3% chord-thickness airfoil with a maximum camber of 3.1% 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 -3.1°.

Thin airfoil theory predicts a stall angle near 11.9° and a peak lift-to-drag ratio around 53 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 B707E typically compare it against profiles of similar thickness: NACA 64A210, AS6092 | Ananda-Selig | AIAA Paper 2018-0310, RAE6-9CK AIRFOIL, RAE 2822 AIRFOIL, NACA 0010-34 a=0.8 c(li)=0.2. The GOE 693 AIRFOIL is another reference profile frequently considered alongside it.