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Sisu KB-24 is a two-axle lorry and special vehicle chassis made by the Finnish heavy vehicle manufacturer Suomen Autoteollisuus (SAT) from 1955 to 1960. It is a six-tonne delivery lorry planned to operate on narrow streets in Finnish cities. The marketing name for the vehicle was Nalle-Sisu, "Teddy-Bear-Sisu". The power options included petrol and diesel motors. In addition to lorries, the chassis were bodied as fire engines, mobile shops and small buses by coachbuilders. KB-24 was replaced by 1961 introduced KB-124, also called Nalle-Sisu. == Development == The new model was developed under supervision of Nils Fagerstedt〔Blomberg: ''Hyttituotantoa tyyppi kerrallaan.'' pp. 174–185.〕 and Senior Engineer Pentti E. Lehtinen. The objective was to design the lorry as light as possible with the biggest possible load capacity. The tyre size selected was 7.50-16", which allowed 1 000 kg load per unit and also a low platform height, and therefore limited the total weight to 6 000 tonnes. The wheelbase was 2 500 mm and the outer dimensions were small, making the lorry agile. A forward-control cabin enabled a 3 450 mm platform length. In order to reduce weight, the frame was joined together completely by welding, instead of riveting, which had been the case in every previous Sisu model. The steel used had almost 50% better tensile strength than the materials used by then. By these actions a weight saving of over 100 kg was reached.〔 Although SAT had its own axle factory, the company decided to source the axles from another company due to low volumes. Kirkstall axles were selected due to the 50-degree turning angle of inner wheel; this enabled a small turning radius. For the engine was selected in-house produced underpowered, four-cylinder Sisu AMA, which was a shortened version of very outdated six-cylinder Sisu AMG.〔 The designing time took total three years, largely due to the new frame construction, before the first prototype, nicknamed ''Nalle Puh'' ("Winnie the Pooh") was produced in 1955. The agility was thoroughly tested in Helsinki at gateways and corners known to be difficult to manoeuvre. Based on the experiences, the door handles were replaced by recessed type, decreasing the maximum width by 50 mm.〔 The prototype featured a wooden-frame cabin produced by Karia, but production models were with completely steel structured type, being the first Sisus with full-steel cabins.〔 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 KB-24」の詳細全文を読む スポンサード リンク
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