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Renault R40
The Renault R40 or Char léger modèle 1935 R modifié 1939 was a French light infantry tank that was used early in World War II, an improvement of the Renault R35, of which it is often considered a variant.
==Development==
In the late thirties there had been several projects to improve the Renault R35 light infantry tank. One of these was directed to the improvement of the horizontal rubber spring suspension system that, apart from being less reliable than originally hoped for, caused an uncomfortable ride, high track and tread wear and an unfavourable weight distribution.
Apart from Lorraine, whose proposal based on Lorraine 37L suspension was rejected as too heavy and complicated to refit, both the AMX factory and the Renault design bureau developed from 1937 several solutions to this problem. Renault proposed a type with doubled wheels on the original bogies, a second type with vertical coil springs and a third type lengthened with a sixth road wheel. However, after tests from 19 May until 26 December 1938, an AMX design using six vertical coil springs covered with 8 mm armour plating with twelve road wheels per side, was on 16 February 1939 selected. The type resembled the suspension of the earlier Char D1 and Char D2. The variant was named the ''Char léger modèle 1935 R modifié 1939''. At first it was literally envisaged as a modification, also to be retrofitted to existing vehicles, but the emergency caused by the outbreak of war in September led to a change in policy: the new suspension would only be implemented on the R 35 production run, from the 1501st vehicle onwards, to take place in February 1940. Late 1939 it was considered to retrofit the existing vehicles with the cheaper Renault vertical coil suspension after all, as it could be fitted by field workshops and thus pose less of a burden to the French industry.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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