Wortmann FX 73-K-170/22 airfoil for use with flaps (K) Max thickness 17.1% at 40.2% chord Max camber 4.6% at 56.5% chord Source UIUC Airfoil Coordinates Database
Modified Wortmann FX 74-CL5-140 high lift airfoil Max thickness 13.1% at 27.1% chord Max camber 9.7% at 41.6% chord Source UIUC Airfoil Coordinates Database