Effect of Gurney Flap Geometry on a S809 Airfoil

Table 1

Effect of GF widths on the lift-to-drag ratio for the S809 airfoil.

AoA	GF_W2	GF_W6	GF_W10
1.03°	56.15%	48.2%	47.54%
3.04°	16.83%	13.64%	12.92%
5.15°	3.51%	3.15%	1.29%
7.1°	-3.7%	-1.74%	-5.5%
9.27°	-14.77%	-10.89%	-15.22%
11.27°	-19.0%	-16.28%	-18.23%