1920, the Lyon plant stopped assembling and the Issy-les-Moulineaux site was consolidated as the headquarters and main production base. In 1933, Caudron was acquired by Renault, following pressure from the French Air Ministry, which was seeking consolidation in the aircraft industry. At the time, Renault was increasing its involvement in the aviation field. Renault took a controlling 55% stake while René Caudron kept the remaining 45%. both the Société des Avions Caudron and Renault's aircraft engine branch were integrated into the Renault Aviation division led by François Lehideux (as top manager), Marcel Riffard (as aircraft body chief designer) and Charles-Edmond Serre (aircraft engine chief designer). The Issy-les-Moulineaux plant improved synergies with the Billancourt engine plant, as both were in the Paris area. In 1937, Renault bought out René Caudron's minority stake. As part of Renault, Caudron centred on producing light, sportier aircraft powered by either inline-four or inline-six cylinder engines, mirroring its automotive range at the time. Riffard was an expert on streamlined designs, which helped to achieve good speeds on low power. Caudron-Renault aircraft set several records in the 1930s. In August 1934, Hélène Boucher, on board her C 450, achieved the world record average speed for 100 kilometres, 1000 kilometres, and the world female speed record. In December 1934, Raymond Delmotte got a land aircraft world speed record of 505 km/h on board his C 460. According to Popular Aviation, by November 1935 Caudron-Renault was producing the following models: the C 272-3 Luciole (2-seat light biplane aircraft), the C 282-8 Phalene VIII (4-seat light monoplane), the C 360 (monoplane), the C 366 Atalante (a monoplane based on an earlier model), the C 440 (twin-engined low-wing cabin monoplane), the C 450 (1-seat racing monoplane), the C 460 (1-seat racing monoplane) and the C 530 Rafale (high-performance, 2-seat light monoplane). By 1936, Renault was hit by the Great Depression and, in 1938, it spun off Caudron-Renault into a separate, autonomous subsidiary in order to focus on its core automotive business. After France was occupied by Nazi Germany during World War II, Caudron-Renault produced trainers, auto bodies, Messerschmitt aircraft parts, Messerschmitt Bf 108s the Caudron's Simoun and Goéland ranges, the Siebel Si-204, for the Wehrmacht. It also repaired aircraft. In February 1942, Willy Messerschmitt requested to Caudron the production of the Messerschmitt Me 164, a Si-104 rival, but that was sabotaged. The Issy-les-Moulineaux plant was almost completely destroyed by RAF and