4"/28 (10.2 cm) QFC
Updated 13 January 2008
These were 4"/27 (10.2 cm) guns converted to take the same cartridge case ammunition as used for the 4"/40 (10.2 cm) QF guns.  Between 20 and 27 guns were converted from 4"/27 (10.2 cm) BL Marks IIIA, IV, V and VI.  These were redesignated as QFC I/IIIA, QFC I/IV, QFC I/V and QFC I/VI, although in gun lists they were always referred to only as 4" (10.2 cm) QFC guns.  Actual bore length as converted was 27.78 calibers.

These guns were converted by giving them either new 'A' tubes or short bore and chamber liners, which resulted in them having the same chamber size as the 4"/40 (10.2 cm) QF guns.  These converted QF guns replaced BL guns on Inflexible and the gunboat Lapwing.  During World War I, a few were still in service on DAMS and three were used by Belgian gunboats on Lake Tanganyika in Africa.

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Gun Characteristics
Designation 4"/28 (10.2 cm) QFC Marks I/IIIA, I/IV, I/V and I/VI
Ship Class Used On Inflexible, Lapwing and DAMS
Date Of Design as QFC:  About 1895
Date In Service as QFC:  1895
Gun Weight 2,912 lbs. (1,321 kg)
Gun Length oa 120 in (3.048 m)
Bore Length 111.1 in (2.822 m)
Rifling Length N/A
Grooves N/A (probably 24)
Lands N/A
Twist N/A
Chamber Volume 213 in3 (3.49 dm3)
Rate Of Fire about 8 - 10 rounds per minute
Type Separate
Projectile Types and Weights HE - 25 lbs. (11.3 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge 3.56 lbs. (1.6 kg) Cord 15
Muzzle Velocity 2,192 fps (668 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A
Elevation With 25 lbs. (11.3 kg) HE Shell
Worl War I Range @ 20 degrees 9,000 yards (8,230 m)
Mount / Turret Data
Designation Single Mounts
Weight  N/A
Elevation -10 / +20 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 17" article by John Campbell in "Warship Volume X"