Airfoil Data
MARSDEN

The Marsden is a thick 23.5% chord-thickness airfoil with a maximum camber of 11.7% at 35% chord, suited to high-lift UAV wings, RC sailplanes, and low-Reynolds-number slow-flyers. At zero angle of attack the cambered geometry generates positive lift, giving an estimated zero-lift angle of -11.7°.

Thin airfoil theory predicts a stall angle near 8.0° and a peak lift-to-drag ratio around 83 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 23% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.

Designers evaluating the MARSDEN typically compare it against profiles of similar thickness: GOE 561 AIRFOIL, GOE 571 AIRFOIL, WORTMANN FX 77-W-343 AIRFOIL, KENNEDY AND MARSDEN AIRFOIL, GOE 531 AIRFOIL. The GOE 685 AIRFOIL is another reference profile frequently considered alongside it.