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The 21cm Versuchs Morser L/12 (Rheinmetall) was an attempt to produce a heavy mortar with barrel recoil, but it was rejected due to a lack of range.
Krupp began work on a similar weapon in 1899, but the Ehrhardt (later renamed Rheinmetall) project didn't begin until 1906. The first prototype was ready by June 1908 when it was purchased by the German Army. Rheinmetall produced a mortar with a longer barrel than the Krupp design (21cm Experimental Mortar L/10), and with the recoil mechanism carried above the barrel, which protruded some way in front of the mechanism. However in other ways the two guns were very similar, firing the same weight of shell to the same range at the same rate of fire.
By the time the L/12 was ready, the Army had decided it wanted a mortar with a longer range, of at least 9,000m. Rheinmetall responded with a 21cm Experimental Mortar L/15, but Krupp won with their 21cm Mortar L/12.
Name |
21-cm Versuchs Morser L/12 (Rheinmetall) |
Calibre |
211mm |
Barrel Length |
2,530mm (L/12) |
Weight for transport |
5,960kg |
Weight in action |
5,710kg |
Elevation |
-5 to 65 degrees |
Traverse |
5 degrees |
Shell Weight |
120kg |
Muzzle Velocity |
285 m/sec |
Maximum Range |
7,000m |
Rate of Fire |
One round per minute |