Ar 66a Prototype
Ar 66b 2nd prototype completed as a floatplane
Ar 66B Production Seaplane version of Ar 66C. Two large steel hollow floats braced with iron cable. About 10 were constructed and used for seaplane training.
Ar 66C Series production model with modified elevators, larger rudder, and larger-diameter wheels.
Operators Germany Luftwaffe