QF 4 inch Mk XVI naval gun
|Ordnance QF 4 inch gun Mk XVI|
Twin Mk XVI on HMCS Haida
Naval anti-aircraft gun
|Place of origin||United Kingdom|
|Used by||Royal Navy
Royal Canadian Navy
Royal Australian Navy
South African Navy
|Wars||World War II
|Weight||Barrel & breech 4,495 lb (2,039 kg)|
|Barrel length||180 inches (4,572 mm) (45 cal))|
|Shell||Fixed QF 35 pounds (15.88 kg) HE
38.25 pounds (17.35 kg) S.A.P.
|Calibre||4-inch (101.6 mm)|
|Breech||vertical sliding block|
|Recoil||hydro - pneumatic 831 millimetres (33 in)|
|Elevation||mounting dependent (-10 to 80 deg on H.A. twin mark XIX mount)|
|Muzzle velocity||2,660 feet per second (811 m/s)|
|Filling weight||9 pounds (4.08 kg)|
The Mk XVI superseded the earlier QF 4 inch Mk V naval gun on many Royal Naval ships during the late 1930s and early 1940s. These guns were usually mounted on HA/LA Mark XIX twin mountings, although several Australian frigates and corvettes had single-gun Mk XX mountings.
As secondary armament (list not complete):
- HMS Hood
- HMS Rodney
- HMS Barham, HMS Malaya, HMS Warspite
- Revenge class battleship
- County class cruiser
- HMS Exeter
- Swiftsure class cruiser
- Crown Colony class cruiser
- Edinburgh class cruiser
- Southampton class cruiser (Town)
- Arethusa class cruiser (1934)
- Perth class cruiser
- Leander class cruiser (1931)
- HMS Effingham
- HMS Danae (ORP Conrad)
- Tribal class destroyer (1936)
As main armament (list not complete):
- Aircraft carriers: HMS Furious, HMS Unicorn
- Escort carriers: Nairana class escort carrier, HMS Pretoria Castle, HMS HMS Activity
- C class cruiser (converted to anti-aircraft cruisers)
- Abdiel class minelayer
- L and M class destroyer (the first series L: HMS Gorham, Lance, Legion, Lively)
- HMS Petard (modified)
- Weapon class destroyer
- V and W class destroyer (after WAIR modification - 15 ships)
- HMS Wallace (after WAIR modification)
- Hunt class destroyer
- Some Bathurst class corvettes (single-gun Mk XX mounting)
- Black Swan class sloop
- Egret class sloop
- Bittern class sloop (modified)
- Grimsby class sloop (modified)
- Bay class frigate
- River class frigate (part of Canadian-built)
- 8 auxiliary AA defence ships
- some landing ships
Allied ships modified in the United Kingdom:
- ORP Błyskawica (Polish)
- Hr.Ms. Jacob van Heemskerck (Dutch)
- Hr.Ms. Isaac Sweers (Dutch)
- 4 French Elan class aviso and Chamois class aviso
Twin guns of HMAS Swan bombarding shore positions in New Guinea, February 1945
Single Mk XX mounting on HMAS Barcoo, 1945
Gunners of V class destroyer HMS Vivien displaying anti-aircraft rounds, 1940
A round in a fuze setter on HMS Belfast (C35)
See also 
- QF 4 inch Mk V naval gun : Royal Navy anti-aircraft predecessor
- List of naval anti-aircraft guns
- List of naval guns
Surviving examples 
- On HMCS Haida, Hamilton, Ortario, Canada.
- Naval Museum of Alberta, Canada
- On HMS Belfast, London.
- On ORP Błyskawica, Gdynia (re-bored to 100 mm).
- A pair at South African National Museum of Military History, Johannesburg
- A pair in a turret from INS Haifa (K-38), at Clandestine Immigration and Naval Museum, Haifa, Israel.
- Two single guns on HMAS Diamantina (K377), Brisbane, Australia
- "British 4"/45 (10.2 cm) QF HA Marks XVI, XVII, XVIII and XXI". NavWeaps. Retrieved 2008-08-25.
- "THE 4-in. Q.F. MARK XVI* GUNS ON THE H.A. TWIN MARK XIX MOUNTING.". Historic Naval Ship Association. Retrieved 2008-08-25.
- Mk XVI = Mark 16. Britain used Roman numerals to denote marks (models) of ordnance until after World War II. Mark XVI indicates this was the sixteenth model of QF 4 inch gun.
|Wikimedia Commons has media related to: QF 4 inch Mk XVI naval gun|
- B.R. 257. Handbook for the 4 inch Q.F. Mark XVI* Gun on the H.A. Twin Mark XIX And Single Mark XX Mountings. G3821/41 Naval Ordnance Department, Admiralty, July 1941.
- Tony DiGiulian, British 4"/45 (10.2 cm) QF HA Marks XVI, XVII, XVIII and XXI
- Youtube video clip of demonstration of loading and firing on HMS Belfast
- Youtube video clip of demonstration of loading and firing on HMS Belfast : closeup Note : for safety reasons, cartridges are seen being loaded without the normal attached shell.