During World War I Luft-Fahrzeug-Gesellschaft (LFG) were best known for their Roland fighter series, though there were several water-borne designs amongst their one-off prototypes, both floatplanes and flying boats.

[3] The wing of the Susanna was essentially rectangular in plan, though the tips were slightly angled and the trailing edge complicated by overhung ailerons and a central cut-out for the pusher propeller.

Its 88 kW (118 hp; 120 PS) Mercedes D.II was on top of the centre-section, supported by transverse, inward leaning pairs of struts from the upper and lower fuselage.

Its completely revised hull was shallow but wide, curving outwards in plan from the nose, at its broadest under the wing and tapering smoothly back to the tail.

The underside ahead of the single step, just aft of the centre of gravity, was concave in section rather than flat; behind it the profile was "claw-like", dipping down into the water then up again to the tail.

[2] It was powered by a 136 kW (182 hp; 185 PS), six-cylinder, 17.5 L (1,070 cu in) Benz Bz.IIIa inline engine,[4] mounted above the wing and driving a larger, 2.9 m (9 ft 6 in) diameter propeller.

This may have been the V 3 as Andersson and Sanger suggest, though in December LFG was granted an export licence for an aircraft with an 185 hp engine, pointing to the V 3a.