SPCA 30
The SPCA 30, also known as SPCA Type III, was a French bomber aircraft built by the Société Provençale de Constructions Aéronautiques (SPCA). Development and design In 1928, the French Service Technique de l'Aéronautique (the government body responsible for producing specifications for aircraft for the Frech armed forces) drew up requirements for a four-seat Multiplace de Combat, a multi-role aircraft capable of day and night bombing, reconnaissance and long–range escort duties. In response, SPCA designed an all-metal twin boom low wing monoplane, the SPCA 30, the only twin boom aircraft entered into the contest. The aircraft's central fuselage had two open cockpits offset to port, and a machine gun mount in the nose, while two more machine gun mounts were in the tailbooms. Two prototypes were completed late in 1930. The first one, registration F-AKCA was fitted with two Lorraine-Dietrich 18Kd water-cooled W engines engines, and made its first flight on 1 February 1931. On 7 August, F-AKCA was being demonstrated at Villacoublay airfield when the aircraft suffered severe vibration when the engines were brought back to full power, with the tailbooms being displaced by more than a metre, leading to tearing of the skin of the aircraft's tailbooms. Despite