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

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  • 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)
10 m 100 m 500 m 1,000 m 1,500 m 2,000 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 58 48 41 36 32
F-73 HE with base fuze 21 16 14 11 10 9
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 N/A 0.1 56.98 79° 80° 81°
OR-240 HE HE 335 2.14 N/A 0.1 181.72 79° 80° 81°
BR-240SP APHE 760 1.42 1 1.5 27.72 47° 60° 65°
F-73 HE with base fuze 760 1.41 1.5 0.1 113.96 79° 80° 81°

Comparison with analogues

Give a comparative description of cannons/machine guns that have firepower equal to this weapon.

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

Summarise and briefly evaluate the weaponry in terms of its characteristics and combat effectiveness. Mark pros and cons as a list.

Pros:

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

Cons:

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

History

Examine the history of the creation and combat usage of the weapon in more detail than in the introduction. If the historical reference turns out to be too long, take it to a separate article, taking a link to the article about the weapon and adding a block "/History" (example: https://wiki.warthunder.com/(Weapon-name)/History) and add a link to it here using the main template. Be sure to reference text and sources by using <ref></ref>, as well as adding them at the end of the article with <references />.

Media

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

See also

External links

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  • topic on the official game forum;
  • encyclopedia page on the weapon;
  • 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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