Airfoil Data
GOE681
GOE 681 AIRFOIL
Wing Geometry Simulator
The GOE 681 AIRFOIL is a 12.6% chord-thickness airfoil with a maximum camber of 6.3% at 29% 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 -6.3°.
Thin airfoil theory predicts a stall angle near 11.4° and a peak lift-to-drag ratio around 70 at typical UAV and light-aircraft Reynolds numbers — useful benchmarks before running a full XFOIL or NeuralFoil polar. The 13% thickness provides structural depth for main-spar placement without excessive drag penalty at moderate speeds.
The GOE681 appears in the wing design of at least 8 documented aircraft, including designs from Gonzalez and Schempp-Hirth. Its proven track record across conventional and rotorcraft designs makes it one of the more field-validated profiles in the UIUC database.
Designers evaluating the GOE681 typically compare it against profiles of similar thickness: GOE 776 AIRFOIL, NACA 64(4)-421, GOE 505 AIRFOIL, ONERA HOR20 AIRFOIL, GOE 256 (JUNKERS E) AIRFOIL. The MH 93 15.98% is another reference profile frequently considered alongside it.
Aircraft Using the GOE681 Airfoil
Gonzalez Gil-Pazo GP-1 | Gonzalez | Goettingen 681 | Clark YH |
Gonzalez Gil-Pazo GP-2 | Gonzalez | Goettingen 681 | Clark YH |
Movero Vandor | Movero | Goettingen 681 | Constant |
Schempp-Hirth Goppingen Go 3 Minimoa | Schempp-Hirth | Goettingen 681/693 | Symmetrical |
Schempp-Hirth Minimoa | Schempp-Hirth | Goettingen 681 | Goettingen 693/Symmetrical |
Tachikawa Ki-25 | Tachikawa | Goettingen 681/693 | Symmetrical |
Walraven 2 | Walraven | Goettingen 681 | Constant |
Walraven 3 | Walraven | Goettingen 681 | Constant |
Wing lofting: 5 of these aircraft taper from GOE681 at the root to a different tip section. Use the Tapered filter to isolate them, then click any tip airfoil link to compare geometries.
Related Airfoils
Engineers evaluating the GOE681 frequently compare it against profiles with comparable geometric constraints. Below are the closest matches based on maximum thickness (12.6%) and max camber (6.3%).