After unsuccessful trials of the 1915 prototype a modified version with more powerful engines was built in 1916, as the Voisin E.28, but the type did not enter production.

[1][2] The Voisin 1915 Triplane had an unorthodox configuration, the tail surfaces being supported between the fuselage and an upper boom attached to the centre section of the upper wing.

Two gun positions were provided, one the nose and second behind the trailing edge of the wings, firing downwards through an aperture in the fuselage.

[1][2][3] The first aircraft built was powered by four 150 hp (110 kW) engines but performance was unsatisfactory, and a second aircraft was built, designated E.28, powered by four 200 hp (150 kW) Hispano-Suiza engines, and a redesigned circular section fuselage.

[1][3] Data from French aircraft of the First World War,[1] Flight[2]General characteristics Performance Armament