Bluebird ...that is an interesting image in........HA Night Shot
How many Naval ratings [Officers/Men] do we see?
What is the gun Officer doing higher up & outboard on the left mount?
...during a firing/action.......this would usually be a job for a non commissioned member of the crew
The following courtesy Wikipedia........Derek
QF 4 inch Mk V naval gunFrom Wikipedia, the free encyclopediaJump to: navigation, search
Ordnance QF 4 inch gun Mk V
HA gun in action during World War II
Type Naval gun
Anti-aircraft gun
Coastal defence gun
Place of origin United Kingdom
Service history
In service 1914 - 1940s
Used by British Empire
Wars World War I
World War II
Production history
Number built 944[1]
Specifications
Weight Barrel & breech: 4,890 lb (2,220 kg)[2]
Barrel length Bore: 15 ft (4.6 m)
(45 cal)
Total: 15 ft 8 in (4.8 m)[2]
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Shell 31 lb (14 kg) fixed QF or Separate-loading QF
Calibre 4-inch (101.6 mm)
Breech horizontal sliding block
Recoil hydro-pneumatic or hydro-spring 15 inches (380 mm)
Elevation mounting dependent
Traverse mounting dependent
Muzzle velocity 2,350 ft/s (716 m/s)[2]
Maximum range Surface: 16,300 yd (15,000 m)[3]
AA: 28,750 ft (8,800 m)[2]
Filling Lyddite, Amatol
Filling weight 5 pounds (2.27 kg)
The QF 4 inch Mk V gun[4] was a Royal Navy gun of World War I which was adapted on HA mountings to the heavy anti-aircraft role both at sea and on land, and was also used as a coast defence gun.