Airfoil Data
GLENNMARTIN4
Glenn Martin 4
Wing Geometry Simulator
The Glenn Martin 4 is a thick 15.4% chord-thickness airfoil with a maximum camber of 7.7% at 30% 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 -7.7°.
Thin airfoil theory predicts a stall angle near 10.4° and a peak lift-to-drag ratio around 73 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 15% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.
Designers evaluating the GLENNMARTIN4 typically compare it against profiles of similar thickness: AH 93-W-300, LIEBECK L1003 AIRFOIL, GOE 222 (MVA H.33) AIRFOIL, WORTMANN FX 72-MS-150A AIRFOIL, GOE 462 AIRFOIL. The RAE 102 AIRFOIL is another reference profile frequently considered alongside it.
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Related Airfoils
Engineers evaluating the GLENNMARTIN4 frequently compare it against profiles with comparable geometric constraints. Below are the closest matches based on maximum thickness (15.4%) and max camber (7.7%).
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