Mk.IX (533 mm)

Description

The Mk.IX torpedo is a British 21-inch (533 mm) torpedo mounted on many destroyers and cruisers in the British tech tree. It is currently the most advanced British 21-inch torpedo in the game, with previous iterations being the Mk.V (533 mm) and the Mk.VIII (533 mm).

Vehicles equipped with this weapon

General info

The Mk.IX torpedo has a diameter of 533 mm, a length of 7.277 m, and weighs 1,693 kg. Without the Torpedo Mode modification installed, it can travel at a maximum speed of 67 km/h for 9.60 km. With it installed, the maximum range is increased to 12.35 km, but the maximum speed is reduced to 56 km/h.

Torpedo Mode Specification Changes
Max Distance (m)	Max Speed (m/s)
+2750	-2

Effective damage

The Mk.IX torpedo carries a 340 kg TNT warhead, which is above average compared to other torpedoes. Destroyers and other smaller vessels can be destroyed by a single hit, but cruisers, especially heavy cruisers, may be able to survive multiple hits, depending on where the hit occurred.

Comparison with analogues

Compared to all other ship-launched torpedoes in the British tech tree:

Mark XII: An 18-inch torpedo, the Mark XII has a higher maximum speed (69 km/h); but it has a much lower maximum range (3.2 km) and has a much smaller explosive mass (176 kg TNT equivalence). With the Torpedo Mode modification installed on both, the Mark XII has a much greater maximum speed (74 km/h), but it has a much lower maximum range (1.37 km).

Mark XV: An improved Mark XII, the Mark XV has a larger explosive mass (395.2 kg TNT equivalence); but it has a lower maximum speed (61 km/h) and has a much lower maximum range (3.2 km). With the Torpedo Mode modification installed on both, the Mark XV has a slightly lower maximum speed (54 km/h) and has a much lower maximum range (5 km).

Mk.V (533 mm): The earliest of the British 21-inch torpedoes, the Mk.V has a higher maximum speed (74 km/h); but it has a much lower maximum range (4.57 km) and has a smaller explosive mass (305 kg TNT equivalence). With the Torpedo Mode modification installed on both, the Mk.V has a lower maximum speed (46 km/h) and has a slighter lower maximum range (12.35 km).

Mk.VIII (533 mm): An improved Mk.V and predecessor to the Mk.IX, the Mk.VIII has a much higher maximum speed (84 km/h); but it has a much lower maximum range (4.57 km) and has a smaller explosive mass (327 kg TNT equivalence). With the Torpedo Mode modification installed on both, the Mk.VIII has a much higher maximum speed (76 km/h), but it has a much lower maximum range (6.4 km).

Compared to common torpedoes mounted on destroyers and cruisers among other nations:

Mk.15 (533 mm): The Mk.15 has a much higher maximum speed (83 km/h); but it has a lower maximum range (5.5 km) and has a much smaller explosive mass (224 kg TNT equivalence). With the Torpedo Mode modification installed on both, the Mk.15 has a higher maximum speed (62 km/h), but it has a lower maximum range (9.15 km).

G7a (533 mm): The G7a has a much higher maximum speed (81 km/h) and has a larger explosive mass (358.4 kg TNT equivalence); but it has a lower maximum range (6 km). With the Torpedo Mode modification installed on both, the G7a has the same maximum speed (56 km/h) and has a higher maximum range (14 km).

53-38 (533 mm): The 53-38 has a much higher maximum speed (82 km/h); but it has a much lower maximum range (4 km) and has a smaller explosive mass (300 kg TNT equivalence). With the Torpedo Mode modification installed, the 53-38 has the same maximum speed (56 km/h), but it has a lower maximum range (10 km).

Type 93 Model 1, Mod 2 (610 mm): The Type 93 Model 1, Mod 2 has a much higher maximum speed (91 km/h), has a much higher maximum range (20 km), and has a much larger explosive mass (627.2 kg TNT equivalence). There is no Torpedo Mode modification available for the Type 93 Model 1, Mod 2.

Type 93 Model 3 (610 mm): The Type 93 Model 3 has a much higher maximum speed (91 km/h), has a much higher maximum range (15 km), and has a much larger explosive mass (998.4 kg TNT equivalence). There is no Torpedo Mode modification available for the Type 93 Model 3.

Usage in battles

Two of the Mk.IX's specifications are worth noting: the above-average 340 kg TNT warhead and the maximum range of 12.35 km with the Torpedo Mode modification installed. Other than this, the torpedo is unremarkable. The maximum range without the Torpedo Mode modification is 9.6, respectable but unremarkable. The maximum speeds, 67 km/h with the Torpedo Mode modification and 56 km/h without, are on the lower end, but there are many slower torpedoes.

For motor torpedo boats and other smaller vessels, the Mk.IX should be used without the Torpedo Mode modification, where the lower maximum range is insignificant in the often short-range engagements, and the higher maximum speed is helpful in making it more difficult for the enemy vessel to evade. On destroyers and cruisers, the Mk.IX should be used with the Torpedo Mode modification, since close-range encounters are much less common, and the increased maximum range provides more strategic usefulness, especially in Encounter and Enduring Confrontation game modes.

Pros and cons

Pros:

Above-average 340 kg TNT explosive mass
High maximum range (12.35 km) with Torpedo Mode modification

Cons:

Below-average top speeds (67 km/h and 56 km/h)

History

Designed in 1928 and entering production and service in 1930, the 21-inch Mark IX was a British surface ship torpedo with a diameter of 21 inches (53.3 cm), a length of 23 feet 10.5 inches (7.277 m), and weighed 3,732 pounds (1,693 kg). It carried a 340 kg TNT warhead. The Mark IX was the second British torpedo to be powered by the burner-cycle engine, the first being the previous 21-inch Mark VIII torpedo. It had two settings: high-speed at 36 knots (66.7 km/h) for 9.6 km, and low-speed at 30 knots (55.7 km/h) for 12.35 km.

Two improved versions of the Mark IX were also developed, Mark IX* and Mark IX**. The Mark IX* increased the range to 10.05 km at the high-speed setting and to 12.8 km at the low-speed setting. The Mark IX** further increased the speed and range for both settings: 41 knots (75.9 km/h) for 10.05 km, and 35 knots (64.8 km/h) for 13.7 km. It also changed the warhead to a smaller 327 kg TNT warhead, though this would be replaced by a 365 kg TNT warhead on later productions of the Mark IX**.

The Mark IX was used on Leander-class light cruisers and any succeeding cruiser classes, and it replaced the older 21-inch Mark V torpedoes on A-class and B-class destroyers, also seeing usage on succeeding destroyer classes.

Media

Excellent additions to the article would be video guides, screenshots from the game, and photos.

External links

[NavWeaps] WWII Torpedoes of the United Kingdom/Britain

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	G7 · G6c
533 mm	G7a · Seal DM2A1
600 mm	H/8
USSR
400 mm	SET-40 · SET-72
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	L3 · Model 1919V · Model 1923DT
Sweden
450 mm	m/38^† · m/41^†
	† = Aerial torpedo ‡ = Aerial and ship-launched torpedo