130 mm/58 SM-2-1 (130 mm)

130 mm/58 SM-2-1 on the Neustrashimy

Description

The 130 mm/58 SM-2-1 is a Soviet naval cannon.

Vehicles equipped with this weapon

General info

The SM-2-1 130 mm weapon system is the Soviet equivalent to the 5 inch/38 Mk.12 weapon system in terms of reliability, calibre, and use. This weapon system is completely new to the WW2 Soviet 130 mm cannons as it features an autoloader, enhanced targeting, and radar capabilities. As already seen in Soviet 130 mm cannons, they are multi-purpose weapon systems with devastating AA capabilities. However, compared to the Mk.12, it has a significantly reduced rate of fire (15 RPM vs 22 RPM) but it counters that with much faster targeting speeds and better cannon elevation angles.

Available ammunition

The SM-2-1 has access to three types of ammunition: OF-42 HE, PB-42 SAP and ZS-42R HE-VT. The OF-42 offers a very potent destructive effect against lightly armoured targets and a superior HE filler than the ZS-42R HE-VT. However, as most HE shells, it barely has the penetration to counter armour (just 37 mm of penetration at all ranges and angles). The PB-42 SAP offers a midpoint between APCBC and HE shells as it has a decent explosive filler with sufficient armour penetration (203 mm flat at 1,000 m). This round should be the main round utilized when fighting all type of ships due to the armour penetration. Lastly, the ZS-42R HE-VT round offers a superb explosive filler for AA purposes but is almost half of the explosive filler of the OF-42 HE. Since it has a proximity fuse, engaging aircraft is much easier.

Penetration statistics
Ammunition	Type of warhead	Penetration @ 0° Angle of Attack (mm)
Ammunition	Type of warhead	1,000 m	2,500 m	5,000 m	7,500 m	10,000 m	15,000 m
OF-42 HE	HE	37	37	37	37	37	37
PB-42 SAP	SAPCBC	204	174	134	104	82	57
ZS-42R HE-VT	HE-VT	35	35	35	35	35	35

Shell details
Ammunition	Type of warhead	Velocity (m/s)	Projectile mass (kg)	Fuse delay (s)	Fuse sensitivity (mm)	Explosive mass (TNT equivalent) (kg)	Ricochet
Ammunition	Type of warhead	Velocity (m/s)	Projectile mass (kg)	Fuse delay (s)	Fuse sensitivity (mm)	Explosive mass (TNT equivalent) (kg)	0%	50%	100%
OF-42 HE	HE	950	33.4	0	0.1	3.83	79°	80°	81°
PB-42 SAP	SAPCBC	950	33.4	0.04	5	2.21	48°	63°	71°

Proximity-fused shell details
Ammunition	Type of warhead	Velocity (m/s)	Projectile mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Arming distance (m)	Trigger radius (m)	Explosive mass (TNT equivalent) (kg)	Ricochet
Ammunition	Type of warhead	Velocity (m/s)	Projectile mass (kg)	Fuse delay (m)	Fuse sensitivity (mm)	Arming distance (m)	Trigger radius (m)	Explosive mass (TNT equivalent) (kg)	0%	50%	100%
ZS-42R HE-VT	HE-VT	955	33.08	0	0.1	240	16	3	79°	80°	81°

Comparison with analogues

The SM-2-1 has a better handling in general than B-13s, to be expected from a much modern weapon system.

Compared to 5 inch/38 Mk.12 (127 mm) - As previously discussed, both systems, while very similar, have many differences, primarily the targeting speed and rate of fire. The SM-2-1 is able to hold a firing for longer with much better performing ammunition. While the 5 inch AAVT Mk.31 has a slightly better explosive filler than the ZS-42R (3.22 kg vs 3 kg) it has a huge speed reduction (792 m/s vs 955 m/s) making it much harder to aim and hit aircraft. The benefit of the SM-2-1 over the Mk.12 while doing AA duties is the elevation angle (-10°/+35° vs -15°/+82°).

Compared to 4.5 inch/45 QF Mark V (114 mm) - The 4.5 inch Mark V is the closest system to the SM-2-1. While it has a faster rate of fire (20 RPM vs 15 RPM) it has slightly reduced targeting speed (17°/s vs 18°/s). In terms of ammunition they are pretty much the same when it comes to type of ammunition, but the SM-2-1 has overall better performing ammunition due to the increased calibre.

Compared to 4.7 inch/45 Mk.XII (120 mm) - As expected from a Cold War weapon system fighting to a WW2 one, the SM-2-1 has a superb performance over it in all aspects. Different from the other systems, the SM-2-1 now has a better rate of fire (15 RPM vs 12 RPM).

Usage in battles

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Pros and cons

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History

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Media

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External links

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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)