Solothurn ST-5
Encyclopedia
The Solothurn ST-5 is a 20 mm anti-aircraft gun designed by Solothurn
Solothurn
The city of Solothurn is the capital of the Canton of Solothurn in Switzerland. The city also comprises the only municipality of the district of the same name.-Pre-roman settlement:...

 in Switzerland
Switzerland
Switzerland name of one of the Swiss cantons. ; ; ; or ), in its full name the Swiss Confederation , is a federal republic consisting of 26 cantons, with Bern as the seat of the federal authorities. The country is situated in Western Europe,Or Central Europe depending on the definition....

 which ultimately was the design basis for the highly successful 2 cm FlaK 30
2 cm FlaK 30
The Flak 30 and improved Flak 38 were 20 mm anti-aircraft guns used by various German forces throughout the Second World War. It was not only the primary German light anti-aircraft gun, but by far the most numerously produced German artillery piece throughout the war...

 series of guns used by Germany
Germany
Germany , officially the Federal Republic of Germany , is a federal parliamentary republic in Europe. The country consists of 16 states while the capital and largest city is Berlin. Germany covers an area of 357,021 km2 and has a largely temperate seasonal climate...

 in World War II
World War II
World War II, or the Second World War , was a global conflict lasting from 1939 to 1945, involving most of the world's nations—including all of the great powers—eventually forming two opposing military alliances: the Allies and the Axis...

.

Solothurn was owned by the German firm Rheinmetall
Rheinmetall
Rheinmetall AG is a German automotive and defence company with factories in Düsseldorf, Kassel and Unterlüß. The company has a long tradition of making guns and artillery pieces...

, which at the time was prohibited from developing certain weapons. It and other German manufacturers sought partnerships with foreign firms, often owning them outright, in an effort to circumvent the terms of the Versailles Treaty.

The ST-5 fired the 'Long Solothurn' ammunition, the cartridge 20 × 138 mm. B. The shell was 138 mm long, making it the most powerful 20 mm round available. While Germany did not adopt the ST-5, the Kriegsmarine
Kriegsmarine
The Kriegsmarine was the name of the German Navy during the Nazi regime . It superseded the Kaiserliche Marine of World War I and the post-war Reichsmarine. The Kriegsmarine was one of three official branches of the Wehrmacht, the unified armed forces of Nazi Germany.The Kriegsmarine grew rapidly...

 did acquire a version of the weapon for ship-board air defense. The weapon was designated 20 mm C/30 and equipped several German naval vessels during World War II. This weapon was further refined for the other German forces as the 2 cm Flak 30 described separately.

See also

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