Thanks to the fact that the Germans were using Swedish industry as a test lab for their own experiments, Sweden gained rich tank building experience by the second half of the 1930s. The Lansdverk L-60, developed under German engineer Otto Merker, became the first Swedish tank available for export. The design of the tank became the base of two similar tanks, the Strv m/38 and Strv m/39 that were used by the Swedish army.
First in mass production
The Swedes didn't rush to adopt the L-60 into service. Their hesitation was understandable: Merker's L-10 (Strv m/31) and L-30 (Strv fm/31) tanks were interesting, but not devoid of drawbacks, and their price was hard to swallow. Only after the first L-60 was sent to Ireland did the Swedish military turn their attention to the domestic tank. An order for a Swedish modification, indexed Landsver L-60S, was made in July of 1936.
Otto Merker's tank had exceptional characteristics for its time and had several original ideas used in its design, including the first torsion bar suspension on a tank. Nevertheless, the Swedish military had their complaints about the tank.
First of all, they were completely dissatisfied with the fact that a Swedish tank used a German engine. In case relations between the two countries went sour (Sweden was not ignorant of what was happening in Europe), their tanks would be left without an engine. The Bussing-NAG L8V-G was not irreplaceable. Sweden had domestically produced engines with similar parameters, like the Scanian-Vabis 335 truck engine, which was in production since 1931. In 1936, these tanks received a 6-cylinder 7.75 L 140 hp Scania-Vabis 1664 inline engine. It was a little larger than the Bussing-NAG L8V-G, but had very similar characteristics. This was the engine used on the Landsverk L-60S.