S.II Trainer with side by side seats for pupil and tutor. The aircraft was fitted successively with Thulin, Oberursel and Curtiss engines. The Aviation Department purchased 15 S.IIs with the registration numbers 84 to 98.
At least one was an S.IIA Ambulance aircraft, an S.II modified at Soesterberg Airfield, the open space between the top wing and fuselage top surface being covered in with transparent panels. The patient lay on a stretcher with his legs towards the tailplane.