7.5 cm mountain cannon Ord 1906
| 7.5 cm mountain cannon Ord 1906 | |
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| General Information | |
| Manufacturer country: | Germany |
| Developer / Manufacturer: | Krupp cast steel factory |
| Development year: | from 1900 |
| Start of production: | 1906 |
| Weapon Category: | Mountain gun |
| Technical specifications | |
| Caliber : |
75 mm |
| Cadence : | 6 rounds / min |
| Furnishing | |
| Ammunition supply: | Breech loader |
The 7.5 cm Ord 1906 mountain cannon replaced the 7.5 cm Ord 1877 mountain cannon manufactured by Krupp . It was the first mountain gun with a barrel recoil that fired unitary cartridges. It was manufactured by the Krupp company in Essen.
In the 1930s it was replaced by the 7.5 cm mountain cannon 1933 L 22 , but remained in use with the mountain troops until 1941. The reusable guns were then taken over by the fortress troops.
The gun
The 7.5 cm mountain cannon 1906 L 22 weighs 399 kg ready to fire with protective shield, 300 kg ready to drive. The gun barrel and breech block manufactured by Krupp are one-piece and made of solid steel. When firing, the system runs back 1050 mm on the housing of the return brake (the pipe cradle), is braked by a hydraulic system and brought forward again by 2 springs. In contrast to the 7.5 cm Ord 1877 mountain cannon , the horizontally inserted flat wedge lock no longer needs a linging ring, as the weapon fires case ammunition like the 7.5 cm 1903 L 30 cannon introduced into the Swiss Army three years earlier . The shot is ignited by the firing pin built into the breech, which strikes the primer located in the center of the case base. Total length of the tube 14 caliber or 1050 mm, caliber 7.5 cm. Progressive right-hand twist 3 ° 59 'to 7 ° 09'. Total length of the gun 1.75 m, width 0.98 m, track 0.74 m.
The weapon was used on its two-part single - arm mount , which was prevented from rolling back by ramming in its ground spur attached to the rear end . Since the barrel was mounted parallel to the barrel cradle , but could also be mounted with an increase of 200 per thousand, the highest possible shooting angle was 400 per thousand (23 °). The lateral direction could be adjusted by 36 per mille to the left and right.
The operating crew consisted of a gun leader and 8 men. When deployed, the gunner sat on the left and the loader on the right on seats attached to both sides of the mount. The aiming and aiming device was attached to the side of the cradle directly in front of the gunner. It consisted of a pole attachment with the aiming and aiming telescope attached to it. Direct aiming was possible with various attachments attached to the cradle, but also via the visor that can be attached to the rear of the breech block and the front sight attached to the front of the tube.
The transport of the 7.5 cm mountain cannon in 1906, pulled on its wheel carriage with iron-tyred wooden wheels, was carried out by horse-drawn train or in 6 loads.
Ammunition used
The 7.5 cm mountain cannon 1906 L 14 fired shrapnel and steel shells with double fuses, and later also steel shells with instant fuses. The projectiles were shorter and lighter than those of the 7.5 cm cannon 03/22 L 30. The casings used were considerably shorter than those of the field cannon, since the unit load 2-4 of the mountain cannon was smaller. The bullet and the case were loaded into the barrel as a unit. One was shot
- Steel grenade, shrapnel with double fuse (S, St G DZ), weight 5'3 kg
- Steel grenade with instant igniter (St G MZ), weight 4.9 kg
ballistics
When using the largest possible charge (Ladg. No. 4), the following initial speed V ° and shooting distance were achieved:
- S, St G DZ, 275 m / s, 4700 m
- St G MZ, 300 m / s, 5000 m
literature
- Les Bouches à Feu de l'Artillerie Suisse, Author: Lt. Col. Jean de Montet, 1980, Edition du Center d'Histoire, Lausanne.
- Artillery II, recoil guns, author: Walter Betschmann, 1984, Verlag Stocker-Schmid, Dietikon-Zürich, ISBN 3-7276-7059-2
- Report of the Chief of the General Staff to the Commander-in-Chief of the Army on active service 1939–1945