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

table class="prettytable"> 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 1 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 2 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
  • ^This gun used the same projectiles as the Mark 16.
  • ^Propellant was in a single bag.
  • Bourrelet diameter was 5.985 inches (15.2 cm).

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

"Naval Weapons of World War Two" by John Campbell
"US Cruisers: An Illustrated Design History" and "US Naval Weapons" both by Norman Friedman
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"U.S. Explosive Ordnance: Ordnance Pamphlet 1664 - May 1947" by Department of the Navy

Page History

18 May 2007 - Benchmark
10 January 2019 - Converted to HTML 5 format, reorganized notes and added mounting sketch