Krupp 150mm long gun M. 1892

Bulgarian designation :150-мм дълго нескорострелно оръдие Д-30Krupp designation :15cm Belagerungskanone L/30Calibre :149.1mm L/30Weight of the barrel :3530 kgWeight of the breech-block :160 kgWeight of the carriage :2550 kgWeight in action :6080 kgWeight of the platform :3370 kgWeight of the limber :420 kgBarrel length :4.470 mNumber of barrel grooves :36Battering charge :10.7 kg of prismatic grey powder3.635/3.6/3.75/3.82 kg of smokeless powder (D.R.P.) + 45 g of black powderCast iron shellweight :40 kg – charge: 1.75 kg black powderlength :L/3.5Krupp shrapnelweight :40 kg – 900 bullets x 20 g, 400 g black powderlength :L/3Schneider shrapnelweight :40 kg – 900 bullets x 20 g, 635 g black powderlength :L/3Shrapnel M. 1914weight :40 kg – 1225 bullets x 15 g, 410 g black powderlength :L/3Schneider mine shellweight :40 kg – 8.785 kg Schneiderite40 kg – 8.170 kg Schneideritelength :L/4.5Krupp mine shellweight :40 kg – 8.850 kg Trotyllength :L/4.5Krupp mine shellweight :40 kg – 6.4 kg Trotyllength :L/3.9Krupp H.E. shellweight :40 kg – 2.53 kg of Füllpulver 60/40length :L/3Muzzle velocity :520 m/sMax. range :10420 m (with percussion fuze)9660 m (with time fuze)Remaining velocity :262 m/s at 10420 mElevation :+ 35° / - 5°Traversing angle :=Transport :towed, usually by oxen, broken into two loadsAmmunition :carried by an ox-cart with a 425 kg payload : 3 boxes each with 3 shells and battering chargesRemarks :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.