It was a shoulder-wing monoplane of wooden construction employing wing warping for lateral control.

[1] After initial flights in early 1917, the Swedish Army purchased two of the single seat K versions.

Both types were delivered without armament but the Dutch Navy fitted theirs with machine guns firing through the propeller arc and also experimented with 20 mm Madson cannons.

[1] The aircraft's performance was good - Thulin himself broke the Swedish altitude record in it in 1919.

[citation needed] Data from Green 1994[1]General characteristics Performance Armament