As lneqban says, but for model airfoils, Cl max can be taken as 1. It don't seem to matter what shape the foil is, at our sizes there is little to choose between them so far a Cl max is concerned. Most of the airfoil data available is for full size sections and does not relate well to model sizes, for example. Cl max for this sort of wing occurs around 14 to 16 degrees AOA, but the model foil will stall around 8 to 9 deg. AOA so will never reach the published Cl. The other question I would raise is; what use is the information going to be? Unless you have very accurate telemetry from the model to you, you will have no idea how fast the model is flying. Knowing the stalling speed will not be much use otherwise.
Evan, WB #12.