These were coast defense guns developed by the Army for use against German Schnellboots ("E-boats") and other small craft. Twenty-two of them were transferred to the Navy and used on old destroyers detailed for coastal escort duties.
Constructed of A tube, part length jacket and breech ring. Used a semi-automatic sliding breech block.
|Designation||6-pdr / 10cwt QF Mark I|
|Ship Class Used On||Campbell, Mackay, Montrose, Whitshed, Wivern, Worcester, Walpole and Windsor|
|Date Of Design||N/A|
|Date In Service||1941 in naval service|
|Gun Weight||1,060 lbs. (481 kg)|
|Gun Length oa||109.7 in (2.787 m)|
|Bore Length||105.5 in (2.679 m)|
|Chamber Volume||73.5 in3 (1.2 dm3)|
|Rate Of Fire||18 rounds per minute|
|Weight of Complete Round||N/A|
|Projectile Types and Weights||HE: 6.28 lbs. (2.85 kg)
HE-T: 6.54 lbs. (2.97 kg)
|Propellant Charge||1.27 lbs. (0.576 kg) N 045|
|Muzzle Velocity||HE: 2,386 fps (727 mps)
HE-T: 2,356 fps (718 mps)
|Approximate Barrel Life||N/A|
|Ammunition stowage per gun||N/A|
- ^Outfits were half HE and half HE-T (tracer).
|Elevation||-10 / +80 degrees|
|Elevation Rate||Manually operated, only|
|Train Rate||Manually operated, only|
|Gun recoil||12 in (30.5 cm)|
The naval mounting had a more extensive shield than did the coast defense mounting.