100 mm/70 SM-5-1 (100 mm)

Description

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Vehicles equipped with this weapon

• Chapayev
• Sverdlov
• Zheleznyakov

General info

The 100 mm/70 SM-5-1 100 mm naval weapon system is the first Soviet and Russian "modern" 100 mm weapon system in the game. It is comparable to 100 mm/55 MLE model 53 (100 mm) in terms of use, practicity and overall the handling. Different from the past WW2 100 mm, the SM-5-1 is fitted with an auto-loader, enhanced targetting and better ammunition. The SM-5-1 is essentially the smaller brother of the 130 mm/58 SM-2-1 (130 mm). It shares the exact same stats and uses but a reduced performance due to the reduced caliber (from 130 mm to 100 mm). This weapon system is particulary useful as either a secondary high caliber artillery or as primary AAA defense. It has a significantly reduced ROF per cannon compared to the MLE Model 53 (~60 RPM vs ~15 RPM) but since the turret is dual mount, the ROF of the SM-5-1 equals half of the ROF of the MLE Model 53. While it may look that the SM-5-1 is overall inferior due to the reduced performance in targetting speed, elevation angles and ROF per turret, this is countered with substantially more weapon mounts per ship. So far in game, the Chapayev and Sverdlov can achieve ~120 RPM and ~180 RPM respectively due to the substantially more weapon mounts compared to the Lübeck and Köln F220 which stay around ~120 RPM.

Available ammunition

The SM-5-1 has access to ammunition we have already seen before in similar weapon systems. These are: OF-55 HE, ZS-55 HE-TF, F-55 HE-F and ZS-55R AA-VT. The wide variety of ammunition gives a vast usage and purposes for this weapon system. As expected, the OF-55 HE offers the most powerful explosive filler for the system that can cause significant damage to lightly armored vehicles due to the rate of fire. However, it barely has penetration to deal with armor (24mm of armor penetration). This is where the F-55 HE-F comes in handy. As an HE round with base fuze, it does not explode immediatly on contact, similar to SAPBC. This round has 73mm of penetration and can deal easier with armored targets. However, the explosive filler is reduces by couple grams. While this does not affect significantly the overall performance of the round, this should be kept in mind. Moving on to the two remaining ammunitions, the ZS-55 and ZS-55R, we can immediately spot a significant change in explosive filler. While the ZS-55 has more than 2kg of TNT equivalent, the ZS-55R has 1.2kg of TNT equivalent. At first sight, the time fuzed version looks better in performance due to the increased filler and barely increased speed, it is much harder to aim and accurately hit an enemy aircraft as the round has to land very close to the aircraft to cause significant damage while the HE-VT can just be fired with higher chances of dealing damage without the hassle of manually changing and setting the time fuze. Both rounds are a major threat when it comes ot dealing with enemy aircraft, it is up to the player to decide which one to pick and use.

Penetration statistics
Ammunition	Type of warhead	Penetration @ 0° Angle of Attack (mm)
		1,000 m	2,500 m	5,000 m	7,500 m	10,000 m	15,000 m
100 mm OF-55HE	HE	24	24	24	24	24	24
100 mm F-55HE	HE-F	64	57	44	-	-	-
100 mm ZS-55R AA-VT	HE-VT	17	17	17	17	17	17
100 mm ZS-55 AA	HE-TF	26	26	26	26	26	26

Shell details
Ammunition	Type of warhead	Velocity (m/s)	Projectile Mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Explosive Mass (TNT equivalent) (g)	Ricochet
							0%	50%	100%
100 mm OF-55HE	HE	1000	15.6	0	0.1	1,940	79°	80°	81°
100 mm F-55HE	HE-F	1000	15.6	4	5	1,770	79°	80°	81°
100 mm ZS-55R AA-VT	HE-VT	995	15.9	0	0.1	1,260	79°	80°	81°
100 mm ZS-55 AA	HE-TF	1000	15.6	0	0.1	2,070	79°	80°	81°

Comparison with analogues

Compared to 100 mm/55 MLE model 53 (100 mm)

As previosly discussed, both systems, while very similar, have many differences, primarily the targeting speed and ROF. The SM-5-1 is able to hold continous firing for longer with a vast variety of ammunitions while the MLE model 53 can only utilize two type of rounds. The overall performance of the rounds are better in terms of explosive filler and the fact the MLE model 53 lacks any sort of armor piercing ammunition gives the upper hand to the SM-5-1. The huge speed difference makes the SM-5-1 easier to aim and use at longer ranges (995+ m/s vs 855 m/s). However, it should be noted that the MLE Model 53 has significantly better targetting speeds and a slightly better vertical aiming angle (85° vs 90°).

Compared to 4.5 inch/45 QF Mark V (114 mm)

The 4.5 inch Mark V is the closest system to the SM-5-1 performance wise. While it has a faster ROF (20 RPM vs 15 RPM) it has slightly reduced targeting speed (17°/s vs 18°/s). Ammunition wise, while both have nearly the exact same ammunition, the SM-5-1 ammunition have much better explosive filler, penetration (with exception of the SAPBC round) and speed (995+ m/s vs 746 m/s) despite being a smaller caliber.

Usage in battles

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Pros and cons

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Pros:

Cons:

History

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Media

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See also

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External links

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• encyclopedia page on the weapon;
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USSR naval cannons
20 mm	ShVAK
25 mm	2M-3
30 mm	AK-230 · 30 mm/54 AK-630 · 30 mm/54 AK-630M · BP "Plamya"
37 mm	37 mm/67 70-K · V-11
45 mm	45 mm/46 21-K · 45 mm/68 21-KM · 45 mm/89 SM-20-ZIF · 45 mm/89 SM-21-ZIF
57 mm	AK-725
75 mm	75 mm/50 Canet patt.1892
76 mm	34-K · 39-K · 76 mm/60 AK-176M · AK-726 · D-56TS · F-34 · Lender AA gun, pattern 1914/15
85 mm	85 mm/52 92-K · 85 mm/54.6 ZIS-C-53 · 90-K
100 mm	100 mm/56 B-34 · 100 mm/70 SM-5-1 · Minizini
102 mm	Pattern 1911
120 mm	120 mm/50 pattern 1905
130 mm	130 mm/55 pattern 1913 · 130 mm/58 SM-2-1 · B-13
152 mm	152 mm/57 B-38
180 mm	180 mm/57 B-1-P · 180 mm/60 B-1-K
305 mm	12-inch/52 pattern 1907 · 305 mm/54 B-50
356 mm	14-inch/52 pattern 1913 (356 mm)
	Foreign:
40 mm	2pdr QF Mk.IIc (Britain) · Skoda (Czechoslovakia)
47 mm	3 pdr QF Hotchkiss (Britain)
76 mm	76 mm/40 Ansaldo mod.1917 (Italy)
88 mm	SK C/30 (Germany)
120 mm	120 mm/50 Mk.4 Bofors M1924 (Sweden) · 120 mm/50 O.T.O. Mod.1933 (Italy)
152 mm	152/53 mm O.T.O. Mod.1929 (Italy)
320 mm	320 mm/44 Ansaldo model 1934 (Italy)