45 mm/46 21-K (45 mm)

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Description

The 45 mm/46 21-K is a Soviet anti-aircraft gun derived from the 20-K tank gun. It is equipped on a number of Soviet coastal and bluewater vessels.

Vehicles equipped with this weapon

General info

Tell us about the tactical and technical characteristics of the cannon or machine gun.

Available ammunition

  • OR-73A HET - Stock HE shell, has low explosive mass and should be replaced quickly
  • O-240 HE - Researchable HE shell, has more than 3 times the explosive mass of the stock but very low velocity, effective at boats in close-range
  • BR-240 - APHE shell, useful against armoured targets like armoured gunboats and turrets that HE shells can't penetrate
  • F-73 - Base-fuze HE shell, effectively acts like an APHE shell with larger explosive mass, is quite effective at dealing damage against ship modules as it penetrates the hull
Penetration statistics
Ammunition Type of
warhead 		Penetration @ 0° Angle of Attack (mm)
100 m 1,000 m 2,000 m 3,000 m 4,000 m 5,000 m
OR-73A HET HE 3 3 3 3 3 3
O-240 HE HE 5 5 5 5 5 5
BR-240 APHE 75 55 38 27 20 15
F-73 HE with base fuze 20 15 10 7 5 4
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%
OR-73A HET HE 760 1.41 0 0.1 56.98 79° 80° 81°
O-240 HE HE 335 2.14 0 0.1 181.72 79° 80° 81°
BR-240 APHE 760 1.42 1 1.5 27.72 47° 60° 65°
F-73 HE 760 1.41 0.015 s 0.1 113.96 79° 80° 81°

Comparison with analogues

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Usage in battles

Much like in real life, the 21-K is horrible at its intended role, anti-aircraft. Its low rate of fire means it is only effective at hitting aircraft when massed, like on Maxim Gorky. On ships with few mounts like Frunze, the 21-K is essentially useless at shooting down aircraft, but it can be used as a weapon against small boats, where its HE shells can be effective at destroying them.

Pros and cons

Pros:

  • Can destroy aircraft in one hit
  • Somewhat effective at fighting small boats with HE and base-fused HE shells

Cons:

  • Terrible anti-aircraft ability due to low rate of fire

History

The 21-K is a naval derivative of the Soviet 20-K tank cannon. More specifically, both guns share the same progenitor, the 19-K 45 mm anti-tank gun model 1942, a scaled-up variant of a gun from Rheinmetall. The modification for use as a naval anti-aircraft gun was a simple matter of replacing the carriage with a pedestal mount and giving the gun a semi-automatic breech, though when production began in 1934, only a quarter of the guns had this breech. The early guns were older built-up gun designs, but they would be replaced with monobloc barrels later in production. Because it was semi-automatic, the gun struggled compared to the autocannons used by other nations. It also suffered from not having a time fuse, meaning it could only destroy aircraft with a direct hit. In 1936-37, a new mount for the 21-K was created for use on river monitors called the 40-K along with the 41-K which was a twin-mount. 42 of both mounts were ultimately built. 2,799 guns were built in total from 1934 until 1947, though by 1941 it was largely superseded by the smaller, automatic 70-K as the Soviet Navy's main anti-aircraft gun. In 1942, production was switched to the upgraded 21-KM.

Media

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

See also

  • 20-K - Tank cannon variant
  • 45 mm/68 21-KM - Variant with longer barrel and higher muzzle velocity
  • 3.7 cm SK C/30 - German anti-aircraft gun with similar rate of fire

External links

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  • topic on the official game forum;
  • other literature.


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)

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