Description

This was a variation of the previous 6"/47 (15.2 cm) Mark 16 and was used only on the Erie (PG-50) class of Patrol Gunboats. Unlike the Mark 16, the Mark 17 was designed for bag ammunition.

The mountings for these weapons were unusual for this type of ship, as they had power elevation and training.

Constructed of a chrome-platted autofretted barrel attached to a breech housing by interrupted threads. Used a side-swing breech mechanism.

Gun Characteristics

Designation 6"/47 (15.2 cm) Mark 17
Ship Class Used On Erie Class
Date Of Design 1933
Date In Service 1938
Gun Weight 5.24 tons (5.32 mt)
Gun Length oa 289.0 in (7.341 m)
Bore Length 282.3 in (7.169 m)
Rifling Length about 238.3 in (6.053 m)
Grooves N/A
Lands N/A
Twist Uniform RH 1 in 30
Chamber Volume 1,478 in3 (24.22 dm3)
Rate Of Fire 5 - 8 rounds per minute

Ammunition

Type Bag
Projectile Types and Weights Common Mark 28 Mods 1 and 2: 105 lbs. (47.6 kg)
Illum Mark 22 Mod 1: 95.40 lbs. (43.3 kg)
Illum Mark 23 Mods 1 and 2: 96.0 lbs. (43.5 kg)
Bursting Charge Common Mark 28 Mods 1 and 2: 5.72 lbs. (2.6 kg) Explosive D
Projectile Length 27 in (68.6 cm)
Propellant Charge 1 34.5 lbs. (15.7 kg) NC
34.0 lbs. (15.4 kg) SPD or SPDN
Muzzle Velocity Common 2,800 fps (853 mps)
Working Pressure 18.5 tons/in2 (2,910 kg/cm2)
Approximate Barrel Life 750 - 1,050 rounds
Ammunition stowage per gun N/A

Bourrelet diameter was 5.985 inches (15.2 cm).

  • ^Propellant was in a single bag.

Range

Range with 105 lbs. (47.6 kg) Common Shell
Elevation Range
20 degrees 19,800 yards (18,100 m)

Mount/Turret Data

Designation
  • Single Pedestal Mounts
    • Erie (4): Mark 18
Weight 15.4 tons (15.65 mt)
Elevation -10 / +20 degrees
Elevation Rate 1a N/A
Train about +150 / -150 degrees
Train Rate 1a N/A
Gun recoil 24 in (61 cm)
Loading Angle N/A
  • ^1.11.2Used 3.5 hp motors for elevation and training.

Sources

Data from:

  • "Naval Weapons of World War Two" by John Campbell
  • "US Cruisers: An Illustrated Design History" and "US Naval Weapons" both by Norman Friedman

Other:

  • "U.S. Explosive Ordnance: Ordnance Pamphlet 1664 - May 1947" by Department of the Navy