Coast Defense Gun
These guns were modified with a larger chamber for coast defense duties to handle the increased amount of propellant used for the special long-range Siegfried shells. Gander and Chamberlain quote a weight of only 105.3 tonnes (103.6 long tons; 116.1 short tons) for these guns, presumably accounting for the extra volume of the enlarged chamber. An armored single mount, the Bettungsschiessgerüst (Firing platform) C/39 was used by these guns. It had a maximum elevation of 60° and could traverse up to 360°, depending on the emplacement. The C/39 mount had two compartments; the upper housed the guns and their loading equipment, while the lower contained the ammunition hoists, their motors, and the elevation and traverse motors. The mount was fully powered and had an underground magazine. Normally these were placed in open concrete barbettes, relying on their armor, but Hitler thought that not enough protection for the guns (Battery Todt) emplaced on Cap-Gris-Nez in the Pas de Calais near Wimereux and ordered a concrete casemate 3.5 metres (11 ft) thick built over and around the mounts. This had the unfortunate effect of limiting their traverse to 120°. Other C/39 mounts were installed at the Hanstholm fortress in Denmark, and the Vara fortress in Kristiansand, Norway.
Four Drh LC/34 turrets, three of which were originally intended to re-arm the Gneisenau and one completed to the Soviet order, modified for land service, were planned to be emplaced at Paimpol, Brittany and on the Cap de la Hague on the Cotentin Peninsula, but construction never actually began. Construction for two of those turrets was well underway at Oxby, Denmark when the war ended.
Read more about this topic: 38 Cm SK C/34 Naval Gun
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