Krupp 150mm long gun M. 1892

Bulgarian designation :		150-мм дълго нескорострелно оръдие Д-30
Krupp designation :		15cm Belagerungskanone L/30
Calibre :		149.1mm L/30
Weight of the barrel :		3530 kg
Weight of the breech-block :		160 kg
Weight of the carriage :		2550 kg
Weight in action :		6080 kg
Weight of the platform :		3370 kg
Weight of the limber :		420 kg
Barrel length :		4.470 m
Number of barrel grooves :		36
Battering charge :		10.7 kg of prismatic grey powder
		3.635/3.6/3.75/3.82 kg of smokeless powder (D.R.P.) + 45 g of black powder
Cast iron shell	weight :	40 kg – charge: 1.75 kg black powder
	length :	L/3.5
Krupp shrapnel	weight :	40 kg – 900 bullets x 20 g, 400 g black powder
	length :	L/3
Schneider shrapnel	weight :	40 kg – 900 bullets x 20 g, 635 g black powder
	length :	L/3
Shrapnel M. 1914	weight :	40 kg – 1225 bullets x 15 g, 410 g black powder
	length :	L/3
Schneider mine shell	weight :	40 kg – 8.785 kg Schneiderite 40 kg – 8.170 kg Schneiderite
	length :	L/4.5
Krupp mine shell	weight :	40 kg – 8.850 kg Trotyl
	length :	L/4.5
Krupp mine shell	weight :	40 kg – 6.4 kg Trotyl
	length :	L/3.9
Krupp H.E. shell	weight :	40 kg – 2.53 kg of Füllpulver 60/40
	length :	L/3
Muzzle velocity :		520 m/s
Max. range :		10420 m (with percussion fuze) 9660 m (with time fuze)
Remaining velocity :		262 m/s at 10420 m
Elevation :		+ 35° / - 5°
Traversing angle :		=
Transport :		towed, usually by oxen, broken into two loads
Ammunition :		carried by an ox-cart with a 425 kg payload : 3 boxes each with 3 shells and battering charges
Remarks : Slow firing heavy gun, Broadwell wedge breech mechanism with an expanding steel obturation ring. Even if it was not a true quick-firing gun, a recoil buffer was connected from the platform to the trail and wooden wedges behind the wheels were used for counter-recoil. These wedges both took up the recoil and made the task of manhandling the gun back into position easier. On either side of the carriage there were two small platforms on which the gunners climbed to load and level the gun. These guns were equipped with quadrant level ¼ circle with goniometer graduated in millièmes. Fourteen guns were delivered in 1892, but two of them mounted steel wheels type Bonagente. In 1911 smokeless powder was introduced.