Hedgehog (weapon) - General Characteristics

General Characteristics

For a single bomb

  • Calibre: 7 in (178 mm)
  • Weight: 65 lb (29 kg)
  • Shell Diameter : 7.2 in (183 mm)
  • Shell Length: 3 ft 10.5 in (1,181 mm)
  • Explosive charge: 30 lb (14 kg) TNT or 35 lb (16 kg) Torpex
  • Range: about 250 yd (230 m)
  • Sinking speed: 22 to 23.5 ft/s (6.7 to 7.2 m/s)
  • Fuse: Contact, High Explosive
  • Firing Order: Ripple in pairs, one every tenth of a second
  • Reload Time: ~3 minutes

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