“20×110mm USN”的意思、由来-开放百科全书

词条

20×110mm USN

释义

Available loads
References

{{infobox firearm cartridge
|name= 20×110mm USN
|image=
|caption=
|origin= {{flag|USA|1891}}
|type= Autocannon
|service= 1950s–present
|used_by=United States NavyRoyal New Zealand Air Force
|wars= Vietnam
|designer= United States Navy
|design_date=
|manufacturer=
|production_date=
|number=
|variants=
|is_SI_specs=yes
|parent=
|case_type= Rimless, bottleneck
|bullet=19.9
|neck=20.6
|shoulder=
|base=29
|rim_dia=29.5
|rim_thick=
|case_length=109.5
|length=185
|case_capacity=
|rifling=
|primer=Electric
|max_pressure=600
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|is_SI_ballistics=no
|bwunit=
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|btype1=
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The 20×110mm USN (also known as 20×110mm US Navy and 20mm Mk-100 Series) was developed by the US Navy after World War II for use in Mk 11 and Mk 12 autocannon. They are called the Mk 100 series as they range from Mk 101 to Mk 109.

It has the same rim diameter as the 20×102mm but a different length and contour. It is not interchangeable with any other 20×110mm cartridge.^[1]

Available loads

Some of the available loads for the 20×110mm USN are as follows:

Name	Pressure (PSI)	Projectile weight (grains)	Projectile Type	Muzzle Velocity (fps)	Identification
Cartridge, 20mm, High Pressure Test, Mk 101 Mod 0 (USN)	Not to exceed 72,500	1700	Inert	Not listed	Green or blue projectile with brown nose and 1/4 black letters reading "High Pressure Test Round"
Cartridge, 20mm, Low Pressure Test, Mk 102 Mod 0 (USN)	Not listed	1700	Inert	Not listed	Green or blue projectile with brown nose and 1/4 black letters reading "Low Pressure Test Round"
Cartridge, 20mm, High Explosive Incendiary, Mk 105 Mod 0 (USN)	Not to exceed 72,500	1700	Inert	3350	Green or blue projectile black lettering or blue projectile with brown nose and black lettering
Cartridge, 20mm, High Explosive Incendiary, Mk 106 Mod 0 & 1 (USN)	60000	1700 ±50	Impact detonating	3350	Unpainted fuze, red and yellow projectile
Cartridge, 20mm, Armor Piercing-Incendiary, Mk 107 Mod 0 (USN)	60000	1700 ±50	Armour Piercing Incendiary	3350	No fuze, Nose of projectile blue or brown with red band. Body of projectile black with white lettering.
Cartridge, 20mm, Armor Piercing-Tracer, Mk 108 Mod 0 (USN)	60000	1700 ±50	Armour Piercing Tracer	3350	No fuze. Hollow windshield. Brown or yellow nose, body of projectile black with white lettering.

There is also a Cartridge, 20mm, Dummy, Mk 103 Mod 0 (USN) which is an inert round. It has an empty primer pocket and holes in the case or a plugged primer pocket. It may be empty or filled with inert material. The projectile is usually brass or bronze plated.^[2]

References

1. ^{{cite book|title=Small Calibre Ammunition Identification Guide, DST-1160G-514-82-VOL 2-CHG 1(Volume 2: 20mm to 40mm Cartridges.)|year=1985|publisher=Defence Intelligence Agency|author=Albert Watson III}}
2. ^{{cite book|title=Cartridges of the World|year=2009|publisher=Gun Digest Books|location=USA|pages=512–513|author=Frank Barnes|edition=12th|authorlink=Frank Barnes (gunsmith)|editor=Layne Simpson}}

1 : Large-caliber cartridges

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