For my site I tried to get some informations about the history and datas from the german World War I U-boat-guns. It took a long time to get them and it wasn´t easy at all. So it desided to publish all my collected informations even it does not fit accurately with the title of my site.

The contraction L/... indicates here the faktor for the pipe length to the caliber diameter.
The contraction U is for u-boat-gun carriage.
The contraction Utof is for u-boat- and torpedo-boat anti-aircraft gun.
The contraction S.K. is for ship cannon (or quick-charging cannon).
The contraction M.P.L. is for central pivot carriage.

For further information, hints or photos also for the u-boat-guns of the World War II I would be gratefully.

3.7 cm cannon
This light cannon was developed by the company Krupp for the application on submarines and had a total weight of 265 kg. The cannon was on a carriage on deck. The pipe had a drop block plug. At the gun a reservoir for 5 cartridges was appropriate. For the operation 3 men were needed, whereby one was responsible for the cartridge supply. The cartridges were brought through the entrance hatch from inside the boat to the cannon. Due to this path I assume that the cartridges were stored in the center due to the boats in the II WW. I did not find a voucher for the use on a submarine yet.

5 cm cannon
About this cannon I haven´t found anything yet.

7,5 cm cannon
This heavy cannon was developed by the company Krupp for the application on submarines and had a total weight of 680 kg. The cannon was provided with a drop block plug. For the operation 3 men were needed, whereby at emergency also 2 men were sufficient. For the underwater travel the cannon was folded downwards and was between the upper deck and the pressure hull. There it was washed around by sea water, which did not affect negatively to the service life of the cannon. By the built in spring the cannon folded automatically upward and took the gun into the "firing position". To put her into operation still the visor and the shoulder piece had to be attached. The whole procedure took 20 seconds at an experienced crew. I did not find a voucher for the application on a submarine yet.

8,8 cm Utof L/30
Here the 8.8 cm S.K. L/30 was set on a new carriage, which brought a larger elevator direction and a better fitness for the application on submarines. In this form it was used on many submarines. On many submarines it is indicated in the literature also as “UK” for "submarine cannon". It probably concerns the Utof version without the large elevator adjusting barness for the anti-aircraft application. More under submarine cannon WK I in Ingolstadt.

8,8 cm S.K. L/35
Since about 1902 a 8,8 cm SK L/35 was found on the battel-ships, which was developed rapidly to L/40, L/45 and L/50. I have not found a voucher for the use on a submarine yet.

10,5 cm cannon
About this cannon I haven´t found anything yet.

15 cm cannon
About this cannon I haven´t found anything yet.

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