Voisin IV

The Voisin IV was a French two-seat bomber and ground attack biplane of the First World War, a single-engine pusher that Voisin developed in 1915 with staggered wings. It differed from earlier Voisin combat aircraft in carrying a mounted 37 mm or 47 mm cannon, and the staggering of the wings offset the extra weight in the nose. The factory designations were LB for the original cannon-armed version and LBS for an improved one with the engine raised compared with the original design. A 89 kW (120 hp) Salmson 9R nine-cylinder water-cooled radial drove a two-bladed fixed-pitch pusher propeller, giving 96 km/h at 2,000 metres and a service ceiling of 2,000 metres, with a 37 mm Hotchkiss gun as armament. It served with the French Aeronautique Militaire.