BL 40.6 cm/52 calibre Mk I gun

	Note by Tsumiki: Any information here is subject to change. This article is a work in progress.

BL 40.6 cm/52 calibre Mk I gun 40,6 cm K/52 SK C/47
Forward batteries of HMS Hecate (FBB-59)
Type	Naval gun
Place of origin	Illusia and Neverendia
Service history
In service	2049–present
Used by	Illusia and Neverendia Memester
Wars	Memesterian Civil War
Production history
Designed	2047
Produced	2049–present
Specifications
Weight	122,350 kg (269,740 lb) (including breech)
Length	22.25 m (73 ft 0 in)
Barrel length	21.112 m (69 ft 3.2 in) (52 calibres)
Shell	APCBC, HE
Shell weight	APCBC: 1,875 kg (4,134 lb) HE: 975 kg (2,150 lb)
Calibre	406 mm (16.0 in)
Recoil	1.5 m (59 in)
Rate of fire	2 rounds per minute
Muzzle velocity	APCBC (Mk XI): 760 m/s (2,500 ft/s) HE (Mk XXVI): 785 m/s (2,580 ft/s)
Effective firing range	29,150 m (31,880 yd) at 20° elevation
Maximum firing range	32,275 m (35,296 yd)

The BL 40.6 cm/52 calibre Mk I gun (Illusian designation 40,6 cm K/52 SK C/47) is an Illuverendian 406 mm (16.0 in) naval gun that serves as the main battery armament of multiple Royal Illuverendian Navy battleships. First introduced in 2049 as an improvement to the older BL 40.6 cm/50-calibre gun, they were installed onboard the Albemarle-class battleships as well as the New Generation Fast Battleships.

They would later be used on the Flufferwealth-class battleships, owned by the Royal Memesterian People's Navy.

Design

Gun

At the orders of the reinstated Royal Illuverendian Navy in 2047, Project S-51 commenced, ordering the production of new Illuverendian heavy battleships that would succeed the Stratocracy's S-50 battleships. Project S-51 also mandated the creation of a new 406 mm (16.0 in) naval gun, as the previous ones were antiquated, and were seen as a symbol of naval power of the Stratocracy. As the keels of the Albemarle class of battleships were laid down a month after the coronation of Alyssa, so began the designing process of the new gun, designated N-MB/c406.

The first gun prototype was delivered a year later, and underwent rigorous testing stages, and proved to be satisfactory. At the same time the prototype was unveiled, the New Generation Fast Battleships project came into force, and the design teams, impressed by the gun's performance, also selected the gun to be the main batteries of their ships.

Mounting

All shipboard mountings of the Mk I gun used an improved mounting from its predecessor. It was designated as the Mk I mount (Drh LC/47), with an elevation of -2° to +25°, moving at 12 degrees per second. The Mk I mount was reused later for the larger BL 46 cm/48 calibre Mk VI gun.

Description

The 40.6 cm/52 gun is an improved, longer-barrel version of the previous Illuverendian 40.6 cm/50-calibre naval gun. Like its predecessor, the Mk I gun is a built-up gun. A number of its components are autofretted. Typical of Illuverendian naval guns, the bore is chromium plated, and sports the standard Sigmeyer breech block.

Operators

Royal Illuverendian Navy

• Albemarle-class battleships (Albemarle subclass)
• Osmanthus-class fast battleships
• Gungnir-class fast battleships
• Hestia-class fast battleships

Royal Memesterian People's Navy

• Flufferwealth-class battleships

See also

• BL 46 cm/48 calibre Mk VI gun