210mm Krupp Mortar M. 1910
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Bulgarian designation : |
21-см
скорострелна мортира
Д-12 |
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German designation : |
Mörser |
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Calibre : |
211mm L/12 |
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Weight of the barrel : |
2620 kg |
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Weight of the breech-block : |
229 kg |
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Weight of the shield : |
86 kg |
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Weight of the carriage : |
3713 kg |
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Weight of the pedrails : |
820 kg |
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Weight in action : |
7380 kg
(with pedrails) – 6630 kg (without pedrails) |
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Weight of the limber : |
450 kg
(empty) – 640 kg (loaded) |
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Weight in marching order : |
8520 kg |
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Weight of the pedrails wagon : |
1328 kg
(empty) – 3345 (loaded) |
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Barrel length : |
2530 mm |
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Land diameter : |
211 mm |
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Groove diameter : |
214 mm |
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Rifling |
length : |
1763 mm |
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twist : |
from 32 to
18 calibres |
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Barrel grooves |
number : |
64 |
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width : |
6.85 mm |
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depth : |
1.5 mm |
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Width of the lands : |
3.5 mm |
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Height of the line of fire : |
1600 mm |
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Battering charges : |
9th
charge: 5.6 kg R.P. (3x25.5) + 50 g n.Gew.P. 71 8th
charge: 5.2 kg R.P. (3x25.5) + 50 g n.Gew.P. 71 7th
charge: 4.9 kg R.P. (3x25.5) + 50 g n.Gew.P. 71 6th
charge: 4.3 kg R.P. (3x25.5) + 50 g n.Gew.P. 71 5th
charge: 3.9 kg R.P. (3x25.5) + 50 g n.Gew.P. 71 4th
charge: 3.5 kg R.P. (3x25.5) + 50 g n.Gew.P. 71 3rd
charge: 3.2 kg R.P. (3x25.5) + 50 g n.Gew.P.
71 2nd
charge: 2.9 kg R.P. (3x25.5) + 50 g n.Gew.P. 71 1st
charge: 2.6 kg R.P. (3x25.5) + 50 g n.Gew.P. 71 |
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4.2
kg Wurfpulver (12x12x2) + 50 g n.Gew.P.
71 (only
for seven charges) |
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3.82
kg Wurfpulver (10x10x1.5) + 20 g n.Gew.P. 71 (only
for Gr. 14 and 14 A) |
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3.95
kg Wurfpulver (10x10x1) + 20 g n.Gew.P.
71 (only
for Gr. 14 and 14 A) |
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Shells |
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21cm-Gr. 96 |
weight : |
120 kg –
charge 17.58 kg of Füllpulver
02 |
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length : |
839.1 mm |
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fuze : |
Kz.
Bod. Z. 10 |
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muzzle velocity : |
367 m/s |
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max. range : |
9400 m with
the 9th charge 8900 m with
the 8th charge 8500 m with
the 7th charge |
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21cm-Gr. 14 |
weight : |
83 kg –
charge 7.7 kg of Füllpulver 60/40 |
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length : |
502 mm
(without the fuze) |
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fuze : |
Gr. Z. 04 or
Gr. Z. 04/14 |
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muzzle velocity : |
406 m/s |
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max. range : |
8800 m with
the 8th charge |
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21cm-Gr. 14 A |
weight : |
83 kg –
charge 6.3 kg of Füllpulver 60/40 |
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length : |
500 mm
(without the fuze) |
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fuze : |
Gr. Z. 04 or
Gr. Z. 04/14 |
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muzzle velocity : |
406 m/s |
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max. range : |
8800 m with
the 8th charge |
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21cm-Gr. 17 |
weight : |
120 kg – charge
13.7 kg of Sprengstoff Nr.
26 |
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length : |
803 mm |
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fuze : |
Kz.
Bod. Z. 10 |
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muzzle velocity : |
367 m/s |
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max. range : |
9400 m with
the 9th charge 8900 m with
the 8th charge 8500 m with
the 7th charge |
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Elevation : |
+ 70° / + 6° |
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Traversing angle : |
4° |
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Wheels |
weight : |
254 kg |
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height : |
1400 mm |
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track : |
1610 mm |
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Transport : |
drawn by
horses dismantled in two loads: barrel - 4065 kg, carriage – 4455 kg |
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Remarks : Quick firing
heavy mortar with hydro-pneumatic recoil system, wedge breech mechanism, box-trail
gun carriage, and shield. Even before the beginning of the World War, the
standard wooden wheels were replaced by steel wheels
with pedrail of Rheinmetall construction. This
meant that the mortar could fire without a platform, making easier to move it
and faster to put it in firing position. It was adopted in
1910 and called simply Mörser without specifying
the calibre. At the beginning of WW1 German Army fielded 216 of these
mortars. The
Bulgarian Army received a little number of these mortars: the 1st
battery of the 4th heavy artillery was rearmed in 1918 with 2 – 21cm mortars, while the
16th battery of the 3rd heavy artillery regiment could
not receive its mortars due to the end of the war. |
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21cm Mörser without shield and pedrails |
21cm Mörser with shield and pedrails |
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Gun wagon |
Pedrails wagon |
