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Topic: Oerlikon 20mm cannon

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	Oerlikon 20 mm cannon - Wikipedia, the free encyclopedia
		The design of the Oerlikon 20mm cannon, by Reinhold Becker dates back to 1914, and is still in use today, after having been used extensively during the Second World War.
		In 1935, the cannon was adapted by Great Britain to be used for in the Royal Navy for the short-range anti-aircraft role.
		The Oerlikon 20mm cannon is a monotube cannon with a large coil around it.
	en.wikipedia.org /wiki/Oerlikon_20mm_cannon (312 words)

	Becker series of 20mm cannon. (Site not responding. Last check: 2007-11-05)
		The Becker Cannon cartridge, which was actually 19.6mm, used a high explosive projectile with a contact detonator.
		Eventually the gun was redesigned to use a 20mm diameter projectile and the case was significantly lengthened, becaming the famous 20mm Oerlikon cartridge.
		The subsequent Oerlikon guns designed to use this cartridge were, probably, the most widely used 20mm anti-aircraft guns before and during WW2 and possibly since.
	www.jedsite.info /artillery/bravo/becker_series/becker-series.html (354 words)

	ANOTHER MISSED OPPORTUNITY: THE OERLIKON FFL CANNON
		Little interest was shown in these cannon at first, the main user in the early 1930s being the French Air Force, which used versions of the FFS (known as the HS.7 and HS.9) in some fighters.
		The weight was reduced from 43 to 34 kg (later reduced further to 30 kg) and the reduced inertia enabled the rate of fire to be increased to 490-500 rpm.
		The Japanese made various modifications to the gun but the first significant one came with the introduction of a belt feed in the Model 4: all Oerlikons were magazine-fed (as were the German MG-FFs with the exception of an electric-powered feed used by some night fighters).
	www.quarry.nildram.co.uk /OeFFL.htm (1326 words)

	The Planes of Warbirds (Site not responding. Last check: 2007-11-05)
		Examples of the second approach are the MG FF and MG 17 weapons of the Bf 109E, the two.50 and four.303 Brownings of the early P-51, or the two 20mm cannon and two 7.7mm guns in the A6M2.
		The disadvantage of cannon was that their weight and recoil precluded the use of more than one or two.
		Especially the larger cannon were intended to destroy the structure of the aircraft itself: A 30mm hit could cut a fighter in two, and put a large hole in a heavy bomber.
	www.andersson.co.uk /RedArrows/mainguns.htm (1963 words)

	The WWII Fighter Gun Debate (Site not responding. Last check: 2007-11-05)
		The Oerlikon F was the basis for the German MG FF and the Japanese Type 99 model 1.
		It was a derivative of the Oerlikon F cannon.
		The MK 108 cannon was a low-velocity weapon, designed to inflict heavy structural damage to the heavy bombers of the 8th AF.
	www.csd.uwo.ca /~pettypi/elevon/gustin_military/fgun.html (4978 words)

	The WWII Fighter Gun Debate: Gun Tables
		The M4, M10 and M9 By a publicity effort the American Aircraft Co. (AAC) managed to associate itself with the M4 and M10 series of cannon, and it is sometimes named as its manufacturer.
		In fact AAC's cannon was far inferior, and never seems to have been used in combat by anyone.
		The relatively modest performance of the Oerlikon cannon has been generalized by many people to the inaccurate conclusion that all WWII 20mm cannon were slow-firing, low-velocity weapons.
	www.geocities.com /capecanaveral/hangar/8217/fgun/fgun-no.html (453 words)

	Focke-Wulf 190
		Typical armament was two 7.9mm machine guns in the upper engine cowling, two Mauser 20mm cannon in the wing roots (each of which could fire 700 rounds per minute, much faster than the equivalent British cannon), plus two more slower firing (450 rounds per minute) Oerlikon 20mm cannon farther out in the wings.
		The wing root MG was replaced by 20mm cannon in the A-3, and this change was also carried over in subsequent 190's.
		Internal armament was reduced to the cowl mounted MG and the 2-20mm cannon in the wing roots.
	www.chuckhawks.com /focke-wulf_190.htm (1642 words)

	Bf 109 Marks ans associated projects
		The engine cannon was often removed in service, and the two wing machine guns replaced by cannon.
		At least one G-14 was modified to carry a 20mm cannon in the rear fuselage firing upwards in a "Schrage Musik" installation meant for night attacks on British bombers, firing upwards into their bellies.
		Armament of two 20mm Hispano HS 404 cannon was fitted inside the wing, the first 109 type to do so since the 109E.
	freespace.virgin.net /john.dell/bf109/Bf109Marks.html (2935 words)

	PT Boat (Site not responding. Last check: 2007-11-05)
		Oerlikon 20mm cannon mostly from plasticard with a brass tube barrel.
		40mm Bofors cannon mostly from plasticard with a brass tube barrel, clad in plastic tube which was tapered on a lathe.
		Twin 0.50in cal machine guns mostly from plasticard with a brass tube barrel, the turrets were formed around a 35mm film casette, so I have used the base of same as the insert in the turret to which the guns are mounted.
	web.ukonline.co.uk /alan.shipman/boats/PT305pt4.htm (115 words)

	The Mitsubishi Zero - Armament
		The Naval 1937 specifications for the 12-Shi fighter called for an armament of two 20mm cannon, two 7.7mm machine guns and provision for two 60kg bombs.
		The wing armament comprised various versions of the Type 99 cannon, a version of the Oerlikon 20mm weapon, manufactured under licence by the Dai-Nihon Heiki Company.
		The versions used in the Model 22 appear to have been drum-magazine types, but later models were belt-fed. The long-barrel type used in the Model 22a were known as the Model 2 Mark 3, and had a rate of fire of 490rpm with a muzzle velocity around 2000ft/see and a range up to l000m.
	mitsubishi_zero.tripod.com /armament.htm (349 words)

	Definition of M39 cannon
		Revolver cannon s were invented by [[Mauser]] late in WW2 as aircr...
		From [[Faribault, Minnesota]] to its mouth, the Cannon falls 280 feet (85 m), an average of 4.8 feet/mil...
		The Cannon River is underlaid with a variety of sedimentary...
	www.wordiq.com /search/M39_cannon.html (751 words)

	THE BATTLE OF BRITAIN
		The key difference was of course the high explosive in the 20mm shells, which was enough to give the Bf 109E-4 almost double the destructive power of the British fighters.
		The low-velocity cannon were particularly difficult to hit with at long range, because of their curved trajectory and long flight time.
		However, the rapid introduction of armour protection during 1940 greatly reduced the effectiveness of all rifle-calibre machine guns and gave the cannon a clear advantage, especially against bombers which were easier to hit but more difficult to destroy.
	homepages.nildram.co.uk /~autogun/BoB.htm (1792 words)

	[No title]
		Two new weapons systems were on order but not yet available; the Oerlikon 20mm gun and the Bofors 40mm gun.
		Between December 7, 1941 and September 1944, the Oerlikon was responsible for 32% of all identifiable AA kills in the fleet.
		To increase firepower of the system, the twin 20mm mounting was developed in 1944 and was first tested in September 1944.
	www.steelnavy.com /WEM350AA.htm (824 words)

	Ki-45 Toryu (Dragon Slayer)
		Assume that the 12.7mm gun was the Ho-103 (900rpm), two being carried by every Ki.45; and the 20mm gun the Ho-5 (850rpm) or the older Type 97 (400rpm).
		Then the 12.7mm guns were fired for a total time of 1.8 seconds, and the 20mm guns for 3.5 or for 1.6 seconds...
		The 20mm cannon described to have only 127rpm is the Ho-3.
	www.warbirdforum.com /toryu2.htm (990 words)

	FileFront Forums - Axis fighters!! Why??!! (Site not responding. Last check: 2007-11-05)
		The BF109 was given 20mm cannons by Willy Messerschmitt back in the day to increase its firepower, so in a realism mod you can use those to try and make up the difference of not having 8 rifle caliber machine guns.
		But when you figure in the cannons the German aircraft should then be able to do as much damage in the same amount of time, not due to rate of fire but do to the increased lethality the cannons provide and I dont see that happening.
		The 4 20mm wasn't that common on the XIV, most of them had the 2X.50+ 2X20mm combination which did pack a punch but a very short one (only 120 rounds per gun on the Hispanos and 2.50's are used for lining up the shot, 2 of them is pretty weak).
	forums.filefront.com /archive/index2.php?t-154919.html (15394 words)

	C & R Weapons For Home Defense - BeyondUnreal Forums
		The Oerlikon gun is an excellent choice for areas in which an increased threat level calls for a more powerful weapon than the.50-cal.
		The ammunition of choice for the Oerlikon in a home defense role is the Mark 9 AP-T (armor piercing tracer), a potent 1,883-grain bullet with 427 grains of powder.
		While the rate of fire on this weapon is much lower than that of the M2 or Oerlikon, at a modest 50 RPM, the Mark 33/34 makes up for this limitation with extremely high hitting power.
	forums.beyondunreal.com /showthread.php?t=105494 (1405 words)

	MPS Concept Database (Site not responding. Last check: 2007-11-05)
		This is a picture from a 1950's manual reproduced in Anthony G. Williams book Rapid Fire, on the development of automatic cannon and heavy machine guns.
		It uses the same action as the later KBA 20mm cannon.
		In the WWII era the largest cannon box mags were usually 20 rounds due to the size of the shell and the limits of spring technology.
	www.mechaps.com /cgi-bin/pictureArchive.cgi?&A=right_page&id=156 (168 words)

	Chapter 3
		No one had experience with large calibre machineguns on aircraft, it was only tested during WW I. The Germans had fitted a 20mm Oerlikon machinegun to the Messerschmitt Bf109.
		RAF chose the 20mm Hispano cannon, which was fitted to a modified wing of a Spitfire.
		It was armed with 4 20mm cannons and became operational shortly before the end of the war.
	www.spitfire.dk /chapter3.htm (7802 words)

	[No title]
		The weapon did not swing freely like the 20mm Oerlikon cannon used by the allies but instead was transversed and elevated by handwheel.
		The C30 20mm were supplanted during the war with the C38 improved 20mm gun.
		There are six of the quad 20mm mounts, 2cm Flakveirling, each with seven parts, two twin barrels, mount, two shield halves, base with two folding gunner’s seats and a separate site/gunner’s seat piece.
	www.steelnavy.com /WEM400GermanAA.htm (920 words)

	Ferret Heaven - Oerlikon mount version (Site not responding. Last check: 2007-11-05)
		In one of the early attempts to upgun the Ferret an Oerlikon 20mm cannon was ring-mounted on a Ferret to suit the requirement of an unnamed african country.
		The main effect of the gun and ring mount was to seriously overload the front suspension and cause some some serious handling problems.
		The project was abandoned when it was realised that the number of modifications neccessary to the vehicle suspension made it an expensive proposition.
	www.ferretscoutcar.info /members/variants/oerlikon/oerlikon-main.html (74 words)

	M82a1, Oicw? [Archive] - BeyondUnreal Forums
		A 20mm cannon relies rather on KE for armoured targets and on HE for soft targets, though it's HE rounds have much more KE than those of the GL.
		If that worked you will see a comparison of the 20mm GL rounds to a 5.56; anything that short can't be a cannon round, though the projectile itself could be taken from a 20mm cannon round.(if that didn't work check http://www.fas.org).
		Though the 20mm GL is supposed to have greater range than the 40mm currently in use, it still doesn't qualify as cannon IMO.
	forums.beyondunreal.com /archive/index.php/t-43482.html (2993 words)

	PTRD to 20mm Vulcan Conversion w/Pics and Descriptions
		I replaced the original barrel with one from a 20mm M61 Vulcan cannon, and added a 35 lb weight to reduce the recoil of the more powerful 20mm rounds.
		The original 14.5mm barrel is on the left, the modified 20mm vulcan barrel with weight is on the right.
		Two 20mm test round casings, and pieces of the M55 TP projos.
	members.aol.com /fiftyguy/ptrd20mm.htm (1202 words)

	The WWII Fighter Gun Debate: Analysis
		(Some 23mm and 37mm cannon were developed in the USSR.) There were of course exceptions; most notably the Japanese Navy did persevere in employing Oerlikon-derived 20mm cannon with a low rate of fire.
		Well-known is the debate in the German Luftwaffe about the armament of the Bf 109F, which carried a single MG 151 cannon and two MG 17 cowl guns.
		was used, or a mixture of modern 20mm cannon with machineguns.
	www.geocities.com /gustin_e/fgun/fgun-an.html (1055 words)

	Untitled Document
		The 20mm Oerlikon cartridge was not introduced until about 1930 so it couldn’t be a cut down 20mm Oerlikon case.
		The cannon had a 15 round vertical feed magazine and could be fired either in single shot mode or in a fully automatic 300 rounds per minute mode.
		The cartridge was redesigned to a use a 20mm diameter projectile and the case was significantly lengthened.
	www.armorypub.com /2000/2-00.htm (624 words)

	Gun effectiveness in 2.7
		In WB 2.7 the impact of 5-10 20mm on a single engine fighter is almost invariably crippling and 10-15 20mm rounds will result in an immediate kill.
		The theory was that the high volume of fire would result in a higher probability of some hits and that a small number of hits with heavy MG bullets was likely to cripple a single engine fighter since one of those bullets was likely to hit a critical component (pilot, engine, fuel, ammunition, etc..).
		In other words between structural failure and magic bullets, 4 20mm rounds should be very likely to do the trick one way or the other (with structural failures and magic bullets both providing about half of the kills).
	homepage.eircom.net /~frontacs/WBStored/Gunneffectivenessin27.html (5940 words)

	PZL P.24F and P.24G Review by Mike Dobrzelecki (Mirage Hobby 1/48)
		The P.24 was among the first fighters to mount 20mm cannons.
		As events grew more ominous in Europe and the P.50 ran into development delays, desperate measures were taken by the Poles to fill the void with a stop-gap program, from which was born the P.11g "Kobuz".
		In the P.24G kit the styrene parts are mounted on three sprues of gray styrene ( only 57 parts) and a fourth is included with the P.24F kit covering the 20mm Oerlikon FF cannon pods and their accompanying shorter wing support struts ( the struts go right through the pod casings).
	kits.kitreview.com /pzlp24reviewmd_1.htm (4611 words)

	Letters (Site not responding. Last check: 2007-11-05)
		Cannon on one side only causes a violent swing to one side and makes aiming impossible.
		This was the first time I had experienced this, but it was to happen many times in the future, in fact it was a very common occurrence with the Hispano cannon, probably caused by sand.
		It was one explosive 20mm shell in the starboard wing, right in the middle of the gun-bay.
	www.152hyderabad.co.uk /html/letters.html (4360 words)

	40mm Bofors Canon (Site not responding. Last check: 2007-11-05)
		Excuse the base on the photo above, this is actually the tripod base for the 20mm Oerlikon Cannon and if you look at the photo for that cannon it shows the correct base for the 37mm.
		In fact the Mk4 cannon was sometimes mounted on this type of tripod base.
		This Cannon (anything bigger than 20mm bore is apparently a Cannon) is fully made of brass sheet, tubing and rectangular sections and soldered with normal 60/40 tin lead solder, I guess that's the electronics background coming out.
	www.pt-boat.com /37mmcanon/37mm.html (262 words)

	Thales Optronic Systems
		FVT900, Thales AFV Systems' (formerly Helio) 20mm Cannon one-man turret, first entered service over 15 years ago.
		The required level of ballistic protection is achieved by the use of high-hardness armour plate, RHA, armour castings or composite armour as appropriate.
		Main - GIAT M621 20mm Auto Cannon / Oerlikon KAA 20mm Auto Cannon, co-axial - 7.62mm Machine Gun (optional).
	www.thalesgroup-optronics.com /dos/products/land/details/fvt900.shtml (263 words)

	40mm Bofors Canon
		The pictures above show the Oerlikon cannon fitted with shoulder cups and sights, this was usual on British MTB's and seems to also be the case on some of the earlier US PT-Boats (maybe where they were retrofitted to the boats by the crew).
		Sometimes there was a bag fitted below the cannon cradle to catch used shell casings and there also seems to have been a strap for the operator.
		The objective is a (possibly operational) 1/20th scale 20mm Canon.
	www.pt-boat.com /20mmcanon/20mm.html (344 words)

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