The Czech firm of Skoda developed a 40mm naval AA gun in the late 1920s. Its designation in a German data table is given as “4 cm Schiffs-Flak L/71”. In another source it is referred to as the “L/67”. Unlike the automatic Bofors gun, the Skoda was manually loaded. The gun was made in single and twin (illustrated) mountings. As far as I know, these mountings were only fitted to two Yugoslavian warships, the destroyer Dubrovnik and the seaplane tender Zmaj .
The only figures I have on the cartridge are from the German data table, which lists three projectiles:
- “Z.Z.Gr”: weight 0.95 kg, MV 950 m/s
- “Z.Z.Gr”: weight 1.0 kg, MV 945 m/s
- “A.Z.Gr”: weight 0.95 kg, MV 950 m/s
The ammunition was clearly very powerful and must have been significantly bigger than the 1930s Bofors 40mm L/56 round (40x311R) which fired 0.95 kg projectiles at 850 m/s. The closest comparator seems to have been the German SKC/30 in 37x380R, which was also a high-velocity manually-loaded naval AA gun.
Does anyone have any information about the cartridge dimensions, or know if an example exists anywhere?
The photo is courtesy of Jaroslav Tvrdy. I am also grateful to Dr Zvonimir Freivogel for providing the data sheet on the gun.