sentences:  The SV.4 was designed as a biplane tourer/training aircraft in the early 1930s, by Stampe et Vertongen in Antwerp.The first model was the SV.4A, an advanced aerobatic trainer, followed by the SV.4B with redesigned wings and the 130 hp/97 kW de Havilland Gipsy Major engine.Only 35 aircraft were built before the company was closed during the Second World War.