40.6 cm SK C/34 gun

The 40.6 cm SK C/34, sometimes known as the Adolfkanone (Adolf gun), was a German naval gun, designed in 1934 by Krupp and originally intended for the early H-class battleships.

Description
Intended to be mounted in battleship turrets, the guns were produced in left and right-handed pairs. These pairs were split for individual mounting in the coastal defence role. The gun's barrel was approximately 20 m long (sources state between 20300 and 21130 mm). In a coastal defence emplacement the gun could be elevated to 52 degrees, giving it a range of 56 km with the special 600 kg long range shell called the Adolf-shell. In terms of construction the 406 mm guns were identical to the 38 cm SK C/34 - only the calibre of the barrel was different. The rate of fire for the weapon was around 2 minutes per round as coastal artillery.

Original naval specifications

 * Date of design - 1934
 * Entered service - 1942 (as coastal defense guns)
 * Bore - 16 inches (406 mm)
 * Length of barrel with rear piece - 70.5 ft (21.5 m)
 * Weight of barrel - 158 metric tons (158,664 kg)
 * Rate of fire - 2 minutes per round
 * Shell weight - standard explosive and armour piercing shell 2,271 lbs (1,020 - 1,030 kg) German type L/4.8 and L/4.4
 * Adolf shell (long range shell) 1,323 lbs (600 kg) German type L/4.2
 * Propellant weight - 2 part charge total weight 302 kg for ordinary shell and 312 kg for long range shell
 * Maximum range - Standard shell 42,800m (42.8 km); long range shell 56,000m (56 km)
 * Muzzle Velocity - Standard shell 2,657 ft/s (810 m/s); long range shell 3,445 ft/s (1,000 m/s)
 * Mountings - 2 gun turret Drh LC/34 (1,475 metric tons)

Coastal Defense
Since the intended 56,000 ton H and J-class battleships were never completed, the guns that had been designed for them were used as coastal defense artillery during the Second World War. At least eleven of the guns were produced; eight were sited in Norway (one was sunk en route), and the other three were used in Poland near Danzig. Soon after their first training shots, the Polish guns were moved to France and sited near Sangatte and renamed battery Lindemann in honour of the fallen captain of the battleship GERMAN BATTLESHIP Bismarck Kapitän zur See Ernst Lindemann.

Gun sites in Poland
The first three guns were situated at the Hel Fortified Area, Poland as Battery Schleswig-Holstein during 1940 to protect the Bay of Danzig. All three guns were fired during May and June 1941 and shortly after the guns were dismounted and transported to France for use as Battery Lindemann. From this new location near Sangatte in France they were used to fire at Dover, in the county of Kent in England and shipping in the English Channel. There is a Museum of Coastal Defence located in the remains of the battery in Hel.

Gun sites in Norway


The seven guns that reached their destinations in Norway were split into two batteries:
 * Battery Dietl with three guns on the island of Engeløya, Steigen. German unit MKB 4 / MAA 516
 * Battery Theo with four guns mounted at Trondenes Fort near Harstad. German unit MKB 5 / MAA 511

After the end of the war the Trondenes guns were taken over by the Norwegian Army, along with 1,227 shells. The battery was last fired in 1957 and formally decommissioned in 1964. The three Engeløya guns were sold for scrap in 1956 but the four guns at Trondenes were spared and one is open as a museum. In the summer there are normally three or four guided tours per day.

Gun sites in France
The Schleswig Holstein Battery from Hel, (German unit MKB 2 / MAA 119) in France recalled as Battery Lindemann (German unit MKB 6 / MAA 244) saw considerable service, with the three guns emplaced singly in turrets, protected by massive concrete encasements in places four metres thick. The guns fired 2,226 shells at Dover between 1940 and 1944. The guns were not put out of action by bombing despite being hit many times, due to the thick concrete. Only the Bruno turret was damaged on 3 September 1944, when a shell from a British Railway Gun hit its elevating gear shortly before the battery was captured.

Naval Projectiles

 * L/4.4 m Bd Z Hb (AP) - 1,030 kg. (25 kg. bursting charge) Armour piercing shell, rear fuse
 * L/4.8 m KZ m Hb (HE) - 1,030 kg. (80 kg. bursting charge) High explosive shell, front fuse
 * L/4.6 m Bd Z Hb (SAP)- 1,030 kg. (45 kg. bursting charge) High explosive shell, rear fuse

Coastal Artillery Projectiles

 * L/4.2 m KZ m Hb (Adoph) (HE)- 600 kg. 50 kg. bursting charge. Both front and rear fuse
 * L/4.1 m KZ m Hb (HE) - 610 kg. 50 kg. bursting charge.