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21" Mark IV
Photo: Keith Allison · Wikimedia Commons · CC BY-SA 2.0
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21"MarkIV

Torpedoes · United Kingdom · 1866
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21"MarkIV

21" Mark IV
21" Mark IV Photo: Keith Allison · Wikimedia Commons · CC BY-SA 2.0
* Absolute score — assessed within category · no era adjustment
Lethality
30
Range
20
Speed
15
Guidance / Homing
5
Counter-Measure Resistance
5
Depth Capability
20
Acoustic Stealth
5
Reliability
40
Technology
10
Cost-Effectiveness
70
Origin United Kingdom
CategoryTorpedoes
EraPre-WWI / Industrial Age
In service1866
Operators5 countries
Data Quality88%
MASS(Military Archive Scoring System)
19
Torpedoes MASS Rating
20/20
Pre-WWI / Industrial Age
116/116
All-Time
Torpedoes · 10 axes scored
Lethality
30
Range
20
Speed
15
Guidance / Homing
5
Counter-Measure Resistance
5
Depth Capability
20
Acoustic Stealth
5
Reliability
40
Technology
10
Cost-Effectiveness
70
ⓘ Regardless of era, the same scoring system applies to all units in the torpedoes category.
01 / Overview
21" Mark IV
Category
Production
1866–
Operators
💰 PERFORMANCE / PRICE ASSESSMENT Methodology ↗
TORPEDOES · PRE-WWI / INDUSTRIAL AGE
20
PERFORMANCE/PRICE
78
UNIT COST (2025 USD)
—
19
torpedoes category
ⓘ Performance/Price and MASS score are computed across all units in the torpedoes category, regardless of era.
02 / Specs & Design
◎General6MOD.6
  • Weapon Typeheavyweight torpedo
  • Service Entry Year1866
  • Weight136 kg
  • Length3.35 m
  • Diameter356 mm
  • In ServiceYes
◈Guidance & Homing5MOD.5
▣Performance4MOD.4
  • Propulsion Typecompressed air (Whitehead), later wet-heater
  • Top Speed10 kn
  • Range640 km
  • Operating Depth15 m
◇Warhead6MOD.6
  • Warhead Typecontact
  • Warhead Weight82 kg
  • Explosive Filler64 kg
  • Fuze Typecontact
  • Nuclear-CapableNo
  • Lethal Radius10 m
◆Platform5MOD.5
▤Warhead Detail2MOD.2
  • Detonation Mechanism / Fuzecontact
  • Explosive Filler Typegunpowder (early), later TNT
03 / History
SERVICE LIFESPANRetired
  1. 1866Production started
160
years in service
0
countries operating
ⓘ 5 countries retired it.
04 / Operators
📖 TERMS ON THIS PAGE2terms
Surface ship from which a torpedo is launched, typically a destroyer, cruiser, or dedicated torpedo boat.
Ship-launched: a torpedo designed to be deployed from surface warships using onboard launch tubes or deck-mounted launchers.
These terms are listed automatically because they appear on this page.full encyclopedia →
📚 Sources
📖 ENCYCLOPEDIA Browse the Torpedoes entry →