Do you have a
picture of this weapon?


The Mark VI was an Elswick gun of Pattern "S" originally built for Chile. The Mark X was a single Elswick gun of Pattern "Q" similar in design and performance to the Mark VI. The Mark X was probably never used afloat.

Mark VI constructed of A tube, breech piece and B tube, wire over the breech piece, full length jacket, breech ring and breech bush screwed into the breech piece. Used a screw breech block whose design was similar to that for the QF Mark III. A total of 29 Mark VI guns were manufactured.

Gun Characteristics

Designation 4"/40 (10.2 cm) QF Mark VI
Ship Class Used On Britain: Broke class, Swordfish and Mimosa
Chile: Almirante Lynch class (ex-Broke class)
Date Of Design N/A
Date In Service about 1914
Gun Weight 1.297 tons (1.41 mt)
Gun Length oa 165.1 in (4.194 m)
Bore Length about 160 in (4.064 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume 240 in3 (3.933 dm3)
Rate Of Fire about 15 rounds per minute


Type Separate
Projectile Types and Weights HE: 31 lbs. (14.06 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge 5.0 lbs. (2.27 kg) MD16
Muzzle Velocity 2,300 fps (701 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A


Range with 31 lbs. (14.06 kg) HE
Elevation Distance
25 degrees 11,630 yards (10,630 m)

Mount/Turret Data

  • Single Mounting
    • Broke (6)1, Mimosa (1 or 2) and Swordfish (N/A): PXI
Weight N/A
Elevation -5 (?) / +25 degrees
Elevation Rate Manually operated, only
Train 360 degrees
Train Rate Manually operated, only
Gun recoil N/A


Data from:

  • "British Naval Guns 1880-1945 No 18" article by John Campbell in "Warship Volume X"

Page History

25 March 2008
12 February 2012
Updated to latest template