Kupp 150mm in two guns armoured cupola M. 1891

 

 

 

 

 

Bulgarian designation :

150-мм двуцевно оръдие Д-25

Calibre :

149.1 mm L/25

Weight of one barrel :

3060 kg

Weight of the breech :

117 kg

Weight of the carriage :

5150 kg

Barrel length :

3.750 m

Barrel grooves

number :

40

depth :

2.75 mm

width :

8.96 mm

Cupola

diameter :

5.7 m

weight :

244 t

armour :

24 cm (20 cm of laminated iron and 4 cm of steel)

Battering charge :

9 kg of prismatic brown powder C/82

Powder shell weight :

31.5 kg – charge: 1.2 kg

A.P. steel shell

length :

2.8 calibres

weight :

39.18 kg – charge: 3.4 kg

Cast iron shell

length :

2.8 calibres

weight :

31.2 kg – charge : 1.25 kg

Steel shrapnel weight :

37.885 kg – charge: 470 g

500 bullets lead-antimony x 26 g

Case shot weight :

41 kg

335 lead balls x 100 g

Muzzle velocity :

520 m/s (ordiary shell)

470 m/s (A.P. steel shell)

Max. range :

9880 m (cast iron shell)

4400 m (shrapnel)

Max. range in 1916 :

8000 m

Elevation :

+ 25° / - 2°

Recoil :

1.58 m

Remarks :

Double barreled turret taken from the Romanian fortifications, and assigned to the Bulgarian coastal artillery in 1916. For the defence of Bucarest Romania had planned to buy 37 armoured cupolas armed with 2 – 15cm L/25 M. 1885 (Tunul “Krupp”, md. 1891, ca. 150 mm) : 14 Creusot M. 1891 A, 13 Châtillon & Commentry (Montluçon) M. 1891 B, 10 St. Chamond M. 1891 and 1 St. Chamond M. 1890, but only 33 were ordered and delivered.