Japan
40 cm/45 (16.1") Type 90 (?)
Updated 23 June 2012
These guns were designated as "40 cm" (15.75") but their actual bore was 41 cm (16.1").  This was an experimental weapon considered for use on early designs for what became the Yamato class battleships.  Calculations showed that it had only about half the armor penetration capability of the 46 cm (18.1") Type 94 and for that reason development was not pursued.

Type 90 (1930) is my estimate.
WNJAP_161-45_Hiraga_painting.jpg

Two versions of Proposed Battleship Hiraga
Detail from a painting by Richard Allison
Scanned from "Battleships:  Axis and Neutral Battleships in World War II"
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Gun Characteristics
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Designation 41 cm/45 (16.1") Type 90 (Model 1930)
Ship Class Used On None - Experimental
Date Of Design about 1935
Date In Service N/A
Gun Weight N/A
Gun Length oa N/A
Bore Length 726.4 in (18.450 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire about 2 rounds per minute
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Ammunition
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Type Bag
Projectile Types and Weights AP - 3,319 lbs. (1,460 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge N/A
Muzzle Velocity 2,559 fps (780 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun About 90 rounds
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Range
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Elevation With 3,219 lbs. (1,460 kg) AP shell
Range @ 45 degrees 41,995 yards (38,400 m)
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Armor Penetration
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Range
Side Armor
Deck Armor
0 yards (0 m)
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21,872 yards (20,000 m)
 10.6" (269 mm)
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32,808 yards (30,000 m)
8.0" (203 mm)
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Note:  This data is from "Battleships:  Axis and Neutral Battleships in World War II" and is based upon the USN Empirical Armor Penetration Formula.
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Mount / Turret Data
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Designation Two-gun and Three-gun Turrets
Weight N/A
Elevation N/A
Rate of Elevation N/A
Train N/A
Rate of Train N/A
Gun Recoil N/A
Loading Angle N/A
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Data from
"Battleships:  Axis and Neutral Battleships in World War II" by W.H. Garzke, Jr. and R.O. Dulin, Jr.
Page History

21 May 2006 - Benchmark
23 June 2012 - Updated to latest template