BL 4.7-inch 45-calibre naval gun

BL 4.7-inch (120 mm), 45-calibre naval gun
"A" gun on destroyer HMAS Stuart, circa. 1930s
TypeNaval gun
Service history
In service1919–1948
Used byUnited Kingdom
WarsWorld War II
Production history
DesignedMk I: 1918
Mk II: 1940[1]
ProducedMk I: 1919
Mk II: 1940[2]
No. builtMk I: 187
Mk II: 32[3]
VariantsMk I, Mk II[note 1]
Specifications
MassMk I: 7,000 pounds (3,200 kg)
Mk II: 7,028 pounds (3,188 kg)[4]
Barrel length213 inches (5.4 m) bore (45 calibres)
Shell50 pounds (22.7 kg)[5]
Calibre4.724 inches (120 mm)
BreechWelin breech block
Elevation-9.5° to +30°[6]
Traverse-120° to +120°[7]
Rate of fire5-6 RPM[8]
Muzzle velocity2,670 feet per second (814 m/s)[9]
Maximum firing range15,800 yards (14,450 m) at 30°[10]

The BL 4.7-inch, 45-calibre gun (actually a metric 120 mm gun) was a British medium-velocity naval gun introduced in 1918 for destroyers. It was designed to counter a new generation of heavily armed German destroyers that were believed to be in development.

  1. ^ DiGiulian
  2. ^ DiGiulian
  3. ^ DiGiulian
  4. ^ DiGiulian
  5. ^ DiGiulian
  6. ^ DiGiulian
  7. ^ DiGiulian
  8. ^ DiGiulian
  9. ^ Mk I : 814 m/s : http://navalhistory.flixco.info/H/72400x53535/8330/a0.htm
  10. ^ Mk I : 14450 metres : http://navalhistory.flixco.info/H/72400x53535/8330/a0.htm


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