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The weapon was more widely used in a variety of mounts for the anti-aircraft role, especially in naval use. Hispano introduced a number of mountings with a variety of sighting systems, feeds and power traverse. The
351:), developed in the mid-1970s, features two HS.820 with new 120-round box magazines mounted on a shared hydraulically powered platform which could be tied into an associated radar-guided fire-control system.
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Developed in the post-World War II era, the HS.820 fires a 20×139 mm round developed from the Swiss 20×139 FMK (and FK 38) as a replacement for their earlier 20×110 mm design of the widely used
358:, A for 20 mm and D as the fourth model. Oerlikon's own 20×128 mm became the KAA in the electrically-fired version, and the KAB in the gas-operated version.
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After
Oerlikon purchased Hispano-Suiza, they undertook a renaming exercise for all of their weapons. The HS.820 was then known as the KAD, meaning
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and equally high 1,000 round per minute firing rate made it a formidable weapon. Nevertheless, the rapid introduction of even higher performance
323:) is a single-gun mounting fed from a 75-round drum, a fairly serious limitation for a gun with such a high rate of fire. Variants included the
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European 20 mm designs, the other being the 20×128 developed by
Oerlikon for a similar role. The HS.820's high 1,100 m/s
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primarily for aircraft use, but more widely used in a series of ground-based anti-aircraft guns. After
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The 20×139 mm round was also widely used in a variety of other weapons, including the
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meant the HS.820 was never as popular in an aircraft role as the HS.404 had been.
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series of armored vehicles, including on a palletised mount in the cabin of a
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The United States produced a slightly modified version of the HS.820 as the
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purchased
Hispano's armaments division in 1970, the HS.820 became the
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339:) that uses dual 75-round magazines for longer firing times. The
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426:): Projectile weight 111 g, tungsten carbide core weight 70 g
331:) with a 50-round drum mounted on top of the weapon, and the
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is a triple-mount variety using the same drum feeds. The
518:"An introduction to collecting 20 mm cannon cartridges"
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365:. It saw use on a number of vehicles, including the
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A for 20, B for 23 or 25, C for 30 and D for 35 mm.
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1,500 m (4,900 ft) against aerial targets
419:): Projectile weight 120 g, explosive filler 4.5 g
412:): Projectile weight 120 g, explosive filler 10 g
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537:A Compendium of Armaments and Military Hardware
270:weapons in the process. A US-built model, the
162:66 kg (146 lb) (without ammunition)
48:introducing citations to additional sources
130:Swiss HS.820 in the HS.666A configuration.
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38:Relevant discussion may be found on the
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299:. The new round was one of two post-
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403:Original Hispano-Suiza ammunition
234:Effective firing range
229:1,050 m/s (3,400 ft/s)
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31:relies largely or entirely on a
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266:, supplanting Oerlikon's own
508:, Jane's Ammunition Handbook
506:20 x 139 round (Switzerland)
288:Schützenpanzer SPz 11-2 Kurz
274:, saw some use on vehicles.
181:1,727 mm (68.0 in)
170:2,489 mm (98.0 in)
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378:amphibious assault vehicle
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146:Place of origin
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452:Rheinmetall Mk 20 Rh-202
393:Rheinmetall MK 20 Rh 202
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215:Rate of fire
59:"Hispano-Suiza HS.820"
539:, Christopher Chant,
442:Oerlikon 20 mm cannon
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437:Hispano-Suiza HS.404
319:(later known as the
225:Muzzle velocity
44:improve this article
397:20 mm modèle F2 gun
286:An armored vehicle
603:Oerlikon-Contraves
527:, Anthony Williams
523:2021-01-20 at the
380:and the ill-fated
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154:Specifications
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42:. Please help
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256:Hispano-Suiza
254:developed by
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100:November 2017
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61: –
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55:Find sources:
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33:single source
29:This article
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564:. Retrieved
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447:Oerlikon KCB
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388:helicopter.
375:Marine Corps
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264:Oerlikon KAD
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178: length
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457:Zastava M55
278:Development
268:KAA and KAB
598:Autocannon
582:Categories
493:References
252:autocannon
140:Autocannon
111:Autocannon
70:newspapers
561:Pinterest
386:Bell UH-1
333:HS.639-B5
325:HS.639-B4
317:HS.639-B3
196:20×139 mm
40:talk page
521:Archived
431:See also
373:and the
260:Oerlikon
467:ZU-23-2
382:MICV-65
367:US Army
349:GAI-DO1
345:HS.666A
337:GAI-CO6
329:GAI-CO3
321:GAI-CO1
192:Caliber
118:HS.820
84:scholar
543:
422:RINT (
356:Kanone
341:HS 665
297:HS.404
245:HS.820
202:Action
176:Barrel
167:Length
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566:4 May
473:Notes
417:APHEI
415:RIA (
408:UIA (
247:is a
149:Swiss
91:JSTOR
77:books
568:2018
541:ISBN
424:APHC
395:and
371:M114
363:M139
301:WWII
272:M139
243:The
159:Mass
136:Type
63:news
462:ZPU
410:HEI
369:'s
46:by
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88:·
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