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Sisu S-21 is a lorry first produced by the Finnish heavy vehicle producer Suomen Autoteollisuus (SAT), then under names Sisu S-22 and S-22K by Yhteissisu, which, after changing its name Vanajan Autotehdas (VAT), produced it with name Vanaja V-48. The production period was 1943–1955. The two-axle, 4×2-driven lorry has a kerb weight of 3 000 kg and gross weight of 7 000–8 000 kg, depending on version. Sisu S-21 was developed during the Continuation War for the Finnish Defence Forces to be produced in relatively large quantities. Serial production was not run up before the war ended and the company founded for wartime production eventually produced vehicles for state organisations and private companies. Many of the post-war Vanaja-badged units were powered by American military surplus engines. VAT replaced the model by 1951 presented Vanaja VK-series; in the meantime, SAT developed it follower named Sisu K-23. == Background == Since its foundation, SAT had increased the level of domestic content in its products gradually. As the Winter War broke out, it became increasingly difficult to get foreign components. A big step forward was a licence agreement with the American Hercules Engine Company, after which SAT started to produce its own engines. In 1942 was came the first entirely Finnish-made components built Sisu S-15.〔Mäkipirtti (Sisu): ''1940-luku.'' p. 19–20.〕 During the Continuation War in 1942 Finnish Defence Forces estimated that it will need 7 000 lorries and buses within the following years. Purchasing of vehicles from abroad was not possible due to lack of currency reserves. SAT, the only domestic vehicle producer, did not have enough of technical and economical resources for a such large scale production, although the company was building a new facility in Karis. The manager of SAT, Tor Nessling, suggested as a solution extending the capacity plan in Karis, but certain cliques suspected that SAT tried to benefit from the war. Nessling, who was also the main owner of SAT, ruled out the offer of the state becoming a co-owner in the company. Therefore, a new lorry producer, Yhteissisu, was started in 1943 under leadership of the state. In addition to the state, the company owners were SAT and a number of other Finnish industrial companies.〔Blomberg: ''Ajatuksena autojen suurtuotanto.'' p. 14–18.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sisu S-21」の詳細全文を読む スポンサード リンク
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