[3] It was designed and built by Werner Schmeidler and Neumann, both at the Breslau Technical College, now the Wrocław University of Technology.

It was the second aircraft with area increasing wings built by them,[3] hence the SN.2 designation, though this is not used in any of the pre-war journals cited here; nothing is known of its predecessor.

[3] The fixed part of the wing had the popular, thick (15%) flat-bottomed Göttingen 387 airfoil[4][5] with room within it for the extension, which had a right angle triangular plan and circular arc profile.

[3][4] It was controlled with a ratchet-restrained lever in the cockpit which was linked to fuselage mounted gears that engaged with racks on the moving surfaces.

[3][6] Behind the engine the fuselage was flat sided with the pilot under the wing leading edge in an enclosed single seat cabin.

At the rear the empennage was conventional, with a roughly semi-circular tailplane mounted on top of the fuselage, a little ahead of a similarly shaped fin.