Mk.13 (569 mm)

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Description

Side view of an Mk.13 (569 mm) torpedo.
Data for Mk.13 (569 mm) torpedo
Metric Imperial
Overall Length 4 m 161 in
Body Diameter 570 mm 22.5 in
Filling Weight 272 kg 600 lb
Total Weight 1,005 kg 2,216 lb
Explosive Filling Torpex
Bomb Type High Explosive

The Mk.13 torpedo was a guinea pig of a torpedo having been the subject of testing and modification since 1925. Used early in World War II, this torpedo failed to operate properly approximately 70% of the time with problems of running cold (dud – not exploding), sinking, not running true (deviating), improper depth or running on the surface. Aircraft were required to fly extremely slow and low when dropping the torpedo as to not damage it on impact with the water and to provide the most stable drop possible, unfortunately, this put the torpedo bomber in a bad position of being an easy target for anti-aircraft guns mounted on enemy ships.

Extensive testing in 1942 determined that the low and slow approach to the Mk.13 launch was actually counterproductive as it caused the torpedo to “belly-flop” on the water causing problems with its internal components. New modifications were tested which replaced fragile parts and components which were susceptible to damage upon impact with the water. A new study also implemented the addition of “drag rings”, “shroud rings” and box shaped tail stabilizers. These devices served to stabilize the torpedo during higher drops, lower the nose for the initial impact and reduce the depth at which the torpedo dove after impact. The wood drag rings and stabilizers were obliterated on impact with the water which absorbed some of the impact, protecting the torpedo. By 1944 the Mk.13 was essentially a brand new torpedo and was accepted as the best aircraft torpedo in the U.S. inventory at that time and was credited with the sinking of the Japanese battleship Yamato.

Vehicles equipped with this weapon

Vehicles equipped with this weapon
Bombers  ▄Avenger Mk II · PBY-5 Catalina · PBY-5A Catalina · ▄Catalina Mk IIIa · ▂PBY-5A Catalina ·
  SB2C-1C · SB2C-4 · ▄SB2C-5 · TBD-1 · TBF-1C
Motor torpedo boats  PT-314 · PT-565 · Thunderbolt (PT-556) · PT-200

General info

General Data for Mk.13 (569 mm) torpedo
Nautical Metric Imperial
Average Drop Altitude 235 m 800 ft
Maximum Drop Altitude 730 m 2,400 ft
Average Drop Speed 260 kts 133 m/s 300 mph
Maximum Drop Speed 410 kts 211 m/s 470 mph
Speed in Water 33.5 kts 17.2 m/s 38.5 mph
Run Depth 0.54 fathom 1 m 3.2 ft
Max Distance 3.0 nm 5,720 m 3.5 mi
Optimal Drop Angle 22° - 32°

Effective damage

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Comparison with analogues

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Usage in battles

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Pros and cons

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Pros:

  • Can be dropped from higher altitudes (800 - 2,000 ft)
  • Can be dropped at higher speeds (maximum 470 mph (756 kph))
  • Higher release increases glide distance, decreases time in water to target

Cons:

  • Aircraft typically only carry one or two at a time

History

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Media

See also

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  • reference to the article about the variant of the weapon;
  • references to approximate analogues by other nations and research trees.

External links

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  • topic on the official game forum;
  • encyclopedia page on the weapon;
  • other literature.


Torpedoes
USA 
450 mm  Mk.7
533 mm  Bliss-Leavitt Mk.1 · Mark 35 · Mk.8 · Mk.8-3 C/D · Mk.15 · Mk.16
569 mm  Mk.13 · Mk.13-6 · Mk.13-6 Case
Germany 
324 mm  Mark 44
450 mm  C/06D · LT 1A/1 · F5W · F5b
500 mm  G6c
533 mm  G7a · Seal DM2A1
600 mm  H/8
USSR 
400 mm  SET-40
450 mm  Pattern 1910 · Pattern 1912 · 45-36NU · 45-36AN · 45-36MAN
533 mm  53-38 · 53-39 · 53-56 · 53-57 · 53-65 · SET-53M · SET-65
Britain 
450 mm  R.G.F. Mark VI** · Mark XII · Mark XV
533 mm  Mark I · Mk.IV · Mk.V · Mk.VIII · Mk.IX · Mk.IX** · 21 inch Mk.20 Bidder
Japan 
324 mm  Mark 46
450 mm  Type 2 · Type 38 No.2 B · Type 43 · Type 44 No.2 · Type 91 Model 2 · Type 91 Model 3
533 mm  Type 6 · Type 43 (1910) · Type 54 Model 3 · Type 72 Model 1 · Type 89
610 mm  Type 8 No.2 · Type 90 · Type 93 Model 1, Mod 2 · Type 93 Model 3
Italy 
450 mm  F200/450 · S.I.170/450X5,25 · W.200/450X5,75 · Whitehead A 110/450
533 mm  S.I.270 · S.I. 250/533,4X7,5 Tipo A · S.I. 270/533,4X7,2 Tipo I · S.I. 270/533X6.84 Tipo L · S.I. 270/533,4X7,2 Tipo M
France 
400 mm  1926DA
450 mm  1909R
550 mm  Model 1923DT
Sweden 
450 mm  m/38 · m/41
  † = Aerial torpedo
‡ = Aerial and ship-launched torpedo