Andrew Hollom AH 21 airfoil (original 9% version) Max thickness 7% at 34.9% chord Max camber 1.8% at 54.8% chord Source UIUC Airfoil Coordinates Database
Althaus AH 63-K-127/24 airfoil for use with flaps (K) Max thickness 12.7% at 40.2% chord Max camber 3.8% at 43.5% chord Source UIUC Airfoil Coordinates Database