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Tauchschiff Projekt 50 - gun calibre correction

 
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NavyTech1918



Joined: 19 Aug 2017
Posts: 1

PostPosted: Wed Aug 23, 2017 12:14 am    Post subject: Tauchschiff Projekt 50 - gun calibre correction Reply with quote

Hello

On the '"Tauchschiff Projekt 50", 1918' (http://dreadnoughtproject.org/plans/SM_Projekt_50_1918/) web page I noticed the emphasis on the main deck guns being 150 mm. Something looked wrong so I decided to check. Using the scale along the keel the length of the these guns are around 11 m which for a 15 cm gun is a calibre of around 73! During WW2 I gather there was a German tank gun that had a calibre of 70 but for WW1 naval guns the usual limit appears to be 45 - which is 6.71 m long (https://en.wikipedia.org/wiki/15_cm_SK_L/45).

I found a drawing of a 15cm L/45 naval gun (http://www.navweaps.com/Weapons/WNGER_59-45_skc16.jpg) and calculated the outside muzzle diameter of 24 cm - while the Projekt 50 deck gun is around 37 cm.

When I looked at the "List of NAVAL guns by country" (https://en.wikipedia.org/wiki/List_of_naval_guns_by_country) web page I came across a perfect fit - a 28cm SK L/40 beast (https://en.wikipedia.org/wiki/28_cm_SK_L/40_gun). It was 11.2m long (does that ring a bell?) and used on two classes of pre-dreadnought battleships. The clincher was that the Battle of Jutland in 1916 showed that these ships were obsolete so their guns were to be removed and adapted for land service.

As far as the Imperial German Navy was concerned what better home for them could there be then usefully reused - mounted on a monstrous steam powered "Tauchschiff"?

Therefore in conclusion it appears that the main deck guns were not 150 mm but 280 mm, which would have come as a nasty surprise. Finally consider that the standard maximum gun for even WW2 subs was 150 mm - only exceeded by the French 'Surcouf' with two 203 mm or the British 'M2' mighty 305 mm!
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Jim Broshot



Joined: 10 Feb 2008
Posts: 25
Location: St. James, Missouri, USA

PostPosted: Thu Aug 31, 2017 11:10 pm    Post subject: Reply with quote

Interesting hypothesis.

I daresay one problem with it is weight. The weight of the WWI German 15cm L/45 C/16 gun which armed "large World War I destroyers...and U-cruisers", which I think would be the gun which this monster would armed with is 3,990kg

The weight of a German 28cm SK L/40 C/01 gun, which armed German Braunschweig and Deutschland class battleships was 45,300kg. Four of these guns would be 181,200kg on the deck of this submarine. I am not sure that this submarine, the monster that is, could carry this much weight on its deck and remain stable and upright.

FWIW, there was a later German 28cm gun, the 28cm L/45 C/07 gun which armed the Nassau class battleships and the battlecruiser Von Der Tann, which weighed 39,800kg and some of these were available for use on land.

source: Norman Friedman, Naval Weapons of World War One
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tone
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Joined: 29 Oct 2004
Posts: 479
Location: Boston

PostPosted: Wed Sep 27, 2017 7:30 am    Post subject: Reply with quote

Interesting. I will look into this some more.

tone
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