Netherlands
28 cm/54.5 (11")
Updated 09 October 2006
In the late 1930s, the Netherlands wanted to build battlecruisers armed with 28 cm (11" ) guns and protection against 20.3 cm (8") shellfire.  As the Netherlands Navy had no experience with designing or building warships of this size, they entered into a technical partnership with the German naval authorities in 1939/1940.  The gun design for these ships was contracted out to Krupp and was largely based upon the German 28 cm (11") SK C/34 gun used on the small battleships Scharnhorst and Gneisenau.  In most respects, the guns and mountings for Design 1047 would have resembled those used on the German ships, although the maximum gun elevation would have been slightly greater.

In reviewing the design concept of these battlecruisers, it should be noted that at the Battle of the River Plate in December of 1939 the similar 28 cm (11") guns of the German Panzerschiffe Admiral Graf Spee out-ranged the 8" (20.3 cm) guns of the British cruiser Exeter.  The German guns inflicted severe damage on Exeter at a range that the proposed Netherlands battlecruiser would have been within her immune zone against the British cruiser.

Much of the detail design work needed for the turrets and gunnery arrangements were still being performed by the German designers even after World War II started in September 1939.  The work was finally halted after the start of the Western Offensive in 1940.

All German 28 cm guns have an actual bore diameter of 28.3 cm (11.1").
WNNeth_11-545_Artist_pic.jpg

Artist's conception of Design 1047
Image courtesy of Naval Counterfactual
WNNeth_11-545_sketch.jpg

Sketch of 1940 design
From "Uit de Miljoenenhoek"
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Gun Characteristics
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Designation 28 cm/54.5 (11.1")
Ship Class Used On "Design 1047" Class
Date Of Design 1940
Date In Service Never completed
Gun Weight
(see Note)		 103,837 lbs. (47,100 kg)
Gun Length oa N/A
Bore Length N/A
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire about 2.5 rounds per minute
Note:  The gun weight figure above is from "Battleships:  Axis and Neutral Battleships in World War II."  However, the same source lists the very similar German gun as being considerably heavier at 117,396 lbs. (53,250 kg).
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Ammunition
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Type Bag - Cartridge
Projectile Types and Weights
(see Note 1)		 APC - 694 lbs. (315 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge N/A
Muzzle Velocity 2,953 fps (900 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun 120 rounds
Notes:

1) Note that the weight of the APC round was midway between those used in the guns on Lützow (ex-Deutschland) and those used in the guns on Scharnhorst.
2) These guns, like most large caliber German guns, used a "fore charge" which was propellant in a silk bag, and a "main charge" which was propellant in a brass case.  The brass case helped to seal the breech of the gun.
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Range
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Elevation With 694 lbs. (315 kg) AP Shell
Range @ 45 degrees 46,590 yards (42,600m)
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Armor Penetration with 727.5 lbs. (330 kg) AP Shell
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Range
Side Armor
Deck Armor
0 yards (0 m)
23.79" (604 mm)
---
8,640 yards (7,900 m)
18.09" (460 mm)
0.76" (19 mm)
16,514 yards (15,100 m)
13.18" (335 mm)
1.63" (41 mm)
20,013 yards (18,288 m)
11.47" (291 mm)
1.87" (48 mm)
30,000 yards (27,432 m)
8.08" (205 mm)
2.99" (76 mm)
Note:  The above information is for the projectiles used for the guns on the Scharnhorst class and is from "Battleships:  Axis and Neutral Battleships of World War II" for a muzzle velocity of 2,920 fps (890 mps).  This is based upon the USN Empirical Formula for Armor Penetration.  As the APC projectiles for Design 1047 were somewhat lighter, the armor penetration would likely be somewhat less than the figures in this table, especially for the longer ranges.
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Range
Side Armor
Deck Armor
10,936 yards (10,000 m)
13.70" (348 mm)
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16,404 yards (15,000 m)
11.02" (280 mm)
 ---
21,872 yards (20,000 m)
8.86" (225 mm)
 ---
27,340 yards (25,000 m)
7.64" (194 mm)
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Note:  The above information is from "German Capital Ships of World War Two" and is for the projectiles used in the guns on Scharnhorst.  The data is taken from pre-war Krupp test shoots on their range in Meppen with L/4,4 APC projectiles using RPC/32 propellant against KC-type armor at an impact angle of 70 degrees.  It should be noted that RPC/32 propellant was replaced by the more powerful RPC/38 type which was the only propellant used in World War II.  As the APC projectiles for Design 1047 were somewhat lighter, the armor penetration would likely be somewhat less than the figures in this table, especially for the longer ranges.
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Mount / Turret Data
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Designation Three-gun Turrets
   "Design 1047" (3)
Weight  N/A
Elevation -5 / +45 degrees
Elevation Rate N/A
Train about +150 / -150 degrees
Train Rate N/A
Gun recoil N/A
Loading Angle N/A, but probably +2 degrees
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Data from
"Battleships:  Allied Battleships in World War II" by W.H. Garzke, Jr. and R.O. Dulin, Jr.
"German Capital Ships of World War Two" by M.J. Whitley
Article in "Uit de Miljoenenhoek" (Dutch Naval Publication), Volume 74, No. 5 (May 1985)
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Special help from Krijn de Rijke