8.8 cm Flak 18/36/37/41
|8.8 cm Flak 18-36|
8.8 cm Flak 18 barrel on a Flak 36 cruciform at the Imperial War Museum in London
|Place of origin||Nazi Germany|
|Used by||Nazi Germany
Republic of China
|Wars||Spanish Civil War, Sino-Japanese War, World War II|
|Unit cost||33,600 RM|
|Number built||21,310|
|Specifications (Flak 36)|
|Weight||7,407 kg (16,325 lbs)|
|Length||5.791 m (20 ft)|
|Barrel length||4.938 m (16 ft 2 in) L/56|
|Height||2.10 m (6 ft 11 in) (firing)|
|Shell||88 × 571 mm. R|
|Caliber||88 mm (3.46 in)|
|Barrels||One, 32 grooves with right-hand increasing twist from 1/45 to 1/30|
|Breech||Horizontal semi-automatic sliding block|
|Recoil||Independent liquid and hydropneumatic|
|Elevation||-3° to +85°|
|Rate of fire||15–20 rpm|
|Muzzle velocity||820 m/s (2,690 ft/s)|
|Effective firing range||14,860 m (16,250 yds) ground target
7,620 m (25,000 ft) effective ceiling
|Maximum firing range||11,900 m (39,000 ft) maximum ceiling|
The 88 mm gun (commonly called the eighty-eight) was a German anti-aircraft and anti-tank artillery gun from World War II. It was widely used by Germany throughout the war, and was one of the most recognized German weapons of that conflict. Development of the original model led to a wide variety of guns.
The name applies to a series of related guns, the first one officially called the 8.8 cm Flak 18, the improved 8.8 cm Flak 36, and later the 8.8 cm Flak 37.[N 1] Flak is a contraction of German Flugzeugabwehrkanone[N 2] meaning "aircraft-defense cannon", the original purpose of the eighty-eight. In English, "flak" became a generic term for ground anti-aircraft fire. In informal German use, the guns were universally known as the Acht-acht ("eight-eight").[N 3]
The versatile carriage allowed the eighty-eight to be fired in a limited anti-tank mode when still on its wheels; it could be completely emplaced in only two-and-a-half minutes. Its successful use as an improvised anti-tank gun led to the development of a tank gun based upon it: the 8.8 cm KwK 36, with the "KwK" abbreviation standing for KampfwagenKanone (literally "battle vehicle cannon", or "tank cannon"). This gun served as the main armament of the Tiger I heavy tank.
In addition to these Krupp designs, Rheinmetall later created a more powerful anti-aircraft gun, the 8.8 cm Flak 41,[N 1] which was produced in relatively small numbers. Krupp responded with another prototype of the long-barreled 88 mm gun, which was further developed into the anti-tank and tank destroyer 8.8 cm PaK 43 gun used for the Elefant and Jagdpanther, and turret-mounted 8.8 cm KwK 43 heavy tank gun of the Tiger II.
- 1 Development history
- 2 Production history
- 3 Combat history
- 4 Comparison with other similar anti-aircraft guns
- 5 Related developments
- 6 The 88 "family"
- 7 Surviving artefacts
- 8 Gallery
- 9 See also
- 10 References
- 11 External links
Initially, anti-aircraft artillery guns of World War I were adaptations of existing medium-caliber weapons, mounted to allow fire at higher angles. By 1915, the German command realized that these were useless for anything beyond deterrence, even against the vulnerable balloons and slow-moving aircraft of the period. With the increase of aircraft performance, many armies developed dedicated AA guns with a high muzzle velocity – allowing the projectiles to reach greater altitudes. It was this muzzle velocity, combined with a projectile of high weight, that made the 8.8 cm Flak one of the great World War II anti-tank guns. The first such German gun was introduced in 1917, and it used the 88 mm caliber, common in the Kaiserliche Marine German navy.
After losing the war, Germany had been forbidden from procuring new weapons of most types. Nevertheless, the Krupp company started the development of a new gun in partnership with Bofors of Sweden. The original design was a 75 mm model. During the prototype phase, the army asked for a gun with considerably greater capability. The designers started again, using 88 mm caliber.
Prototype 88s were first produced in 1928. These early models, the Flak 18, used a single-piece barrel with a length of 56 calibers, led to the commonly seen designation L/56.
First generation: Flak 18, 36 and 37 
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The Flak 18 was mounted on a cruciform gun carriage. A simple-to-operate "semi-automatic" loading system ejected fired shells, allowing it to be reloaded by simply inserting a new shell into a tray. The gun would then fire, recoil, and, during the return stroke, the empty case would be thrown backward by levers, a cam would then engage and recock the gun. This resulted in firing rates of 15 to 20 rounds a minute, which was better than similar weapons of the era. High explosive ammunition was used against aircraft and personnel, and armour-piercing and high-explosive anti-tank against tanks and other armored vehicles.
Widespread production started with the Nazi rise to power in 1933, the Flak 18 was available in small numbers when Germany intervened in the Spanish Civil War. It quickly proved to be the best anti-aircraft weapon then available. The flak detachment with 88s proved accurate and versatile in combat against mainly land targets, the high muzzle velocity and large caliber made it an excellent long-range anti-vehicle and anti-bunker weapon. This experience also demonstrated a number of minor problems and potential improvement opportunities.
Many of these improvements were incorporated into the Flak 36, which had a two-piece barrel for easier replacement of worn liners. The new, heavier, carriage allowed it to fire in an emergency when still on its wheels and without its outriggers, but with a very limited traverse and elevation. For normal emplacement, one single-axle bogie was detached from the front outrigger and one from the rear, side outriggers were then hinged from the vertical position to the ground; the total time to set up was estimated at two-and-a-half minutes. Both modes of operation made the gun much more suitable for fast-moving operations, the basic concept of the blitzkrieg.
Flak 36s were often fitted with an armoured shield that provided limited protection for the gunners. These shields could be re-fitted on older Flak 18s as well. The weight of the gun meant that only large vehicles could move it, the SdKfz 7 half-track became a common prime mover.
Targeting indicators were attached from the central controller to each of the four guns of a battery, allowing for coordinated fire. Indeed, with the automatic loading system, the gun layers' job was to keep the gun barrel trained on the target area based on the signals from the controller. The loaders would keep the weapon fed with live ammunition which would fire immediately upon insertion—all while the gun layer aimed the weapon according to the data.
The later model was the Flak 37 which included updated instrumentation to allow the gun layers to follow directions from the single director more easily. Some sources mistakenly cite that the Flak 37 was not equipped for anti-armor purposes. The fact is all 8.8 cm Flak guns were capable of the dual role.
The parts of the various versions of the guns were interchangeable, and it was not uncommon for various parts to be "mixed and matched" on a particular example.
Second generation: Flak 41 
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As early as 1939 the Luftwaffe asked for newer weapons with an even better performance, to address the problems of defending against attack by high-flying aircraft. Rheinmetall responded with a new 88 mm design with a longer cartridge and a longer barrel.
A prototype was ready in early 1941 leading to the designation 8.8 cm Flak 41. The new gun fired a 9.4-kilogram (20 lb) shell at a muzzle velocity of 1,000 m/s (3,280 ft/s), giving it an effective ceiling of 11,300 meters (37,100 ft) and a maximum of 15,000 meters (49,000 ft), which General Otto Wilhelm von Renz said to be "almost equal to the 128-mm." It featured a lower silhouette on its turntable mounting than did the 8.8-cm Flak 18/36/37 on its pedestal mounting. The barrel was at first a three-section one with a length of 74 calibers, and then redesigned to dual-section with a length of 72 calibers. Improvements in reloading raised the firing rate, with 20 to 25 rounds a minute being quoted.
Because of problems in service, the guns were almost exclusively used in Germany where they could be properly maintained and serviced. The Flak 41 had the disadvantage of complexity, and was prone to problems with ammunition, empty cases often jamming on extraction. Because of the high cost and complexity of this weapon, the Germans manufactured relatively few of them, 556 in all. The first deliveries were made in March 1943 and, as of August 1944, only 157 were fielded; with 318 in January 1945. An unusual hybrid adaptation, known as the Flak 37/41, mounted the Flak 41 gun tube onto the Flak 37 carriage, of which only 13 were produced.
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Thousands of 88 mm guns were produced throughout the war in various models and mounts.
|8.8 cm Flak 18/36/37||2,459||183||1,130||1,998||3,052||4,712||6,482||738||20,754|
|8.8 cm Flak 41||0||0||0||0||48||122||290||96?||556|
|10.5 cm Flak 38/39||?||38||290||509||701||1,220||1,331||92||more than 4,181|
|12.8 cm Flak 40 (including twins)||0||0||0||0||65||298||664||98||1,125|
Compared to other artillery types, German industry built for example, 570 heavy (caliber 88–128 mm) flak guns, 1,020 field artillery pieces (caliber 75–210 mm), and 1,300 tank guns, anti-tank guns, plus self-propelled guns in December 1943.
The eighty-eight was used in two main roles: as a mobile heavy anti-aircraft and anti-tank gun, in support of the troops at the front; and as a more static anti-aircraft gun for home defence.
Anti-aircraft defense of the Reich
After 1935, the anti-aircraft defense of Nazi Germany was controlled by the Luftwaffe. By the beginning of World War II the Luftwaffe's anti-aircraft artillery employed 6,700 light (2 cm and 3,7 cm) and 2,628 heavy flak guns. Of the latter, a small number were 10.5 cm Flak 38s or 39s, the majority were 8.8 cm Flak 18s, 36s or 37s. This was twice as many heavy AA guns as the Air Defence of Great Britain (ADGB) had at the time, with France and the United States having even less.
Throughout the entire war, the majority of 88 mm guns were used in their original anti-aircraft role.
The financial costs associated with anti-aircraft cannon were substantial, especially when compared to fighter aircraft. For example, in January 1943 – at a time Germany was desperately fighting to regain the strategic initiative in the East and was also facing a heavy bombing campaign in the West – expenditures on anti-aircraft defenses were 39 million reichsmarks, whereas all the remaining weapons and munitions production amounted to 93 million (including 20 million of the navy budget and only nine million of the aircraft-related budget).
By August 1944, there were 10,704 Flak 18, 36 and 37 guns in service, now complemented also by the formidable 12.8 cm Flak 40, owing to the increase in US and British bombing raids during 1943 and 1944. There were complaints that, due to the apparent ineffectiveness of anti-aircraft defenses as a whole, the guns should be transferred from air defense units to anti-tank duties, but this politically unpopular move was never made.
Support of ground troops
The 8.8cm Flaks performed well in its original role of an anti-aircraft gun, and it proved to be a superb anti-tank gun as well. Its success was due to its versatility: the standard anti-aircraft platform allowed gunners to depress the muzzle below the horizontal, unlike most of its contemporaries. As WW2 progressed, it was becoming increasingly clear that existing anti-tank weapons were unable to pierce the armor of heavier enemy tanks. Ground commanders began increasingly to utilize the 8.8cm Flak against enemy tanks.
Similarly to the anti-aircraft role, as an anti-tank weapon the 8.8cm Flak was tactically arranged into batteries, usually four guns to each. The higher-level tactical unit was, most commonly, a mixed anti-aircraft battalion (Flak-Abteilung, gemischte).[N 4] It totaled 12 such guns on average, supplanted by light cannons.
The German Condor Legion made extensive use of the 8.8cm Flak 18 in the Spanish Civil War, where its usefulness as an anti-tank weapon and a general artillery piece exceeded its role as an anti-aircraft gun.
For the 1940 Battle of France, the army was supported by eighty-eights deployed in twenty-four mixed flak battalions. The 8.8cm Flak was used against heavily armored tanks such as the Char B1 bis and Matilda II, whose frontal armour could not be penetrated by the light 3.7 cm anti-tank guns then available. The 8.8cm Flak was powerful enough to penetrate over 84 mm of armor at a range of 2 km, making it an unparalleled anti-tank weapon during the early days of the war, and still formidable against all but the heaviest tanks at the end. Erwin Rommel's timely use of the gun to blunt the British counterattack at Arras ended any hope of a breakout from the blitzkrieg encirclement of May 1940. In the entire Battle of France, the weapon destroyed 152 tanks and 151 bunkers. The Battle of France also saw the introduction of vehicle mounted 8.8cm Flak 18s, the so-called "Bunkerknacker" on the SdKfz 8 heavy tractor.
During the North African campaign, Rommel made the most effective use of the weapon, as he lured tanks of the British 8th Army into traps by baiting them with apparently retreating German panzers. A mere two flak battalions destroyed 264 British tanks throughout 1941. One example of this tactic later in that theater was the battle of Faid in Tunisia, where Rommel hid and camouflaged many 8.8cm Flaks (with additional 7.5cm Pak 40s and 5cm Pak 38s) in cactus-filled areas, inexperienced U.S tankers and commanders rushed into a valley at Faid only to be completely obliterated. When the U.S. Army's M3 Stuart and M4 Sherman tanks pursued, concealed German guns picked them off at ranges far beyond those of their 37mm and 75 mm guns respectively.
For the invasion of the Soviet Union, Germany deployed the 8.8cm Flak in 51 mixed AA battalions. They were mostly Luftwaffe-subordinated units attached to the Heer at corps or army level, with approximately one battalion per corps. The weapon saw continuous use on the eastern front. The appearance of the outstanding T-34 and KV tanks shocked the German panzer crews and anti-tank teams, who could only penetrate the Soviet tanks' armor at extremely close range when using the standard 37 mm and 50 mm guns.
The 8.8cm Flak in the anti-tank role was arguably most effective in the flat and open terrain of Libya, Egypt and the eastern front. The less open terrain in Italy and Northern France was less suitable for long-range AT guns.
The success of the German anti-tank weapons caused the Allies to take steps to defend against it in new tank designs. On July 18 and 19 1944 a Luftwaffe 8.8 cm anti-aircraft battery was re-purposed by then Major Hans von Luck to attack British tanks near Cagny taking part in Operation Goodwood. 20 tanks were killed by these guns within the first few seconds and at least 40 tanks were knocked out by 8.8cm Flaks during the engagement.
By February 1945, there were 327 heavy anti-aircraft batteries delegated against the Soviet land armies, which was 21% of those dedicated solely to the anti-aircraft defense of the country.
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On 14 September 1942, Flak-Abt. I./43 (Major Wegener) employed these guns against a commando landing raid called Operation Agreement by the British Royal Navy near Tobruk, damaging the destroyer HMS Sikh so severely that she sank while being towed by HMS Zulu.
Use by other armed forces
In 1937, the Chinese Nationalist Government imported 20 Flak 18 guns and used them to defend the Castles along the Yangtze River. They were captured by the Japanese Imperial Army during the Sino-Japanese War.
In 1943 - 1944 Finland bought 90 8,8 cm FlaK 37 cannons from Germany and they were used for air defence of largest cities in Finland. These cannons played an important role against Soviet air raids in Helsinki in February 1944. After the war these cannons remained in Finnish use as AA-guns until 1977 and after that as coastal guns until early 2000's.
Four batteries ( 16 guns) of 88mm guns (Flak. 18) initially reached Spain as AA with the Condor Legion in 1936, but it was soon used as anti-tank, anti-bunker and even as anti-battery. More guns were sent later, and some more 88-mm guns were supplied to Spanish army units. At the end of the war the Spanish Army was using all of the Flak 18 guns sent, some 52 units.
Initially, the Flak 18 batteries were deployed to protect the airfields and logistics bases used by German Condor legion. The nature of war in Spain, with its wildly fluctuating front lines and the presence of Russian tanks, forced the Germans to employ the Flak 18 guns in a direct fire mode against ground targets. Besides this, the initial scarcity of Nationalist Spanish artillery and the general low proficiency of its crews soon forced the usage of the Flak 18 gun as a direct infantry support weapon. By the end of the war the 88-mm guns had performed far more missions as an anti-tank and direct-fire Field Artillery gun than as an anti-aircraft gun. During the war German 88-mm guns were involved in 377 combat engagements, only 31 were against enemy aircraft. On the other side the use of the 88-mm in close proximity to the enemy made it vulnerable to infantry fire. Casualties among the legion's 88-mm gun batteries in the Spanish Civil War were second only to those among the bomber pilots.
In early 1937 in the fighting around Malaga, a battery of 88-mm guns was assigned to support an infantry brigade. Bad weather grounded the main bomber force, but the assault succeeded, mainly because of the concentrated and accurate fire of the supporting 88-mm guns. Flak 18 batteries were by the nationalist army at the Battle of Ebro, used for direct fire against pillboxes and for indirect fire in the advance towards Barcelona.
Following the Spanish Civil war, more Flak. 36 models arrived in 1943 (88 guns 88/56 mm Flak-36) and since 1943 they were manufactured under licence in Trubia under the denomination FT 44 (about 200 guns).
The Flak 36 guns were briefly issued in late 1944 to the American 7th Army as captured weapons. The 79th Field Artillery Battalion (Provisional) was formed from personnel of the 79th and 179th Field Artillery Groups to fire captured German artillery pieces at the height of an ammunition shortage. Similarly, the 244th Field Artillery Battalion was temporarily equipped with a miscellany of captured German 88mm guns and 105mm and 150mm howitzers. As of December 31, 1944, the 244th Field Artillery Battalion had fired a total of 10,706 rounds through captured German weapons.
During the civil war in Yugoslavia in the 1990s, various Flak guns were used, mainly by the naval artillery of the Yugoslav People's Army (JNA). The Serbian Army (VJ) also used Flak carriages mounted with double 262 mm rocket launch tubes from the M-87 Orkan MLRS, instead of the 88mm gun. It was capable of deploying cluster bombs, as well as anti-personnel and anti-tank mines, at up to 50 km. Only a few were built in mid-1993, the entire project was generally regarded as unsuccessful.
Comparison with other similar anti-aircraft guns
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The Flak 18 was not as powerful as its Italian or Allied counterparts. As an anti-aircraft gun it fired a 9.2 kilogram (20 lb) shell at a muzzle velocity of 790 m/s (2,600 ft/s) to an effective ceiling of 7,900 meters (25,900 ft) (at maximum 10,600 meters (34,800 ft)). Although this was useful against US daylight raids, which typically flew at 7,600 meters (24,900 ft), many aircraft could fly higher than its maximum effective ceiling.
In comparison, the British 3.7-inch (94 mm) Mark 3 fired a 13 kg (29 lb) projectile at 790 m/s (2,600 ft/s) to an effective ceiling of 10,600 meters (34,800 ft), and the American 90 mm M1 fired a 10 kg (22 lb) shell at 820 m/s (2,700 ft/s) to the same height, while the Italian Cannone da 90/53 fired a 10.33 kg projectile at 830 m/s to an effective ceiling of 12,000 meters (39,000 ft). The Allied weapons' capabilities were augmented by the introduction of proximity fuses, which vastly increased their effectiveness.
The Allies' and Italian weapons were heavier and less mobile, with the Allied weapons being almost useless for ground fire until numerous modifications were carried out. While the US and Italian 90 mm would go on to serve as powerful anti-tank guns, they were by no means as universally deployed as tank-killers as was the German 88.
The KwK 36 (abbreviation of Kampfwagenkanone 36) was a tank gun developed It was developed and built by Krupp in parallel to the Flak 36, with which it shared ammunition and ballistics. It was the main armament of the Tiger I heavy tank.
PaK 43 and KwK 43
At the time that Rheinmetall developed the Flak 41, Krupp tried to compete with their 8.8 cm Gerät 42 proposal, which was not accepted for production as an anti-aircraft gun. Krupp continued development, resulting in the dreaded 8.8 cm PaK 43 anti-tank gun and the related 8.8 cm KwK 43 tank gun.
The PaK 43 (an abbreviation of Panzerabwehrkanone 43) used a new cruciform mount with the gun much closer to the ground, making it far easier to hide and harder to hit. It was also provided with a much stronger and more angled armour shield to provide better protection to the crew. In addition to the towed version, there were also self-propelled versions of the PaK 43 gun, including the lightly armored Nashorn, and the strongly armored, fully casemate-enclosed Elefant and Jagdpanther tank destroyers.
All versions were able to penetrate about 200 mm of armour at 1,000 m, allowing it to defeat the armor of any contemporary tank.
The 88 "family"
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Guns using the 88×571R mm cartridge
- 8.8 cm Flak 18 Had a new semi-automatic breech, making it a high-velocity gun. It entered production in Germany in 1933 and used the Sonderanhänger 201 trailer. its weight was seven tonnes. Its rate of fire was 15 to 20 rounds per minute. It was later fitted with a gun shield to protect the crew when engaging ground targets. It was produced by Krupp.
- Mod 1938 II: Approximately 50 guns were modified so a single man could adjust the elevation and traverse.
- 8.8 cm Flak 36 Entered service 1936–37. It used the redesigned trailer Sonderanhänger 202 which enabled a faster time into action from the move. The SdAnh 202 had twin wheels on two similar carriages. It could engage ground targets from the traveling position. Its weight was seven tonnes. Its rate of fire was 15 to 20 rounds per minute. It was produced by Krupp. It was subsequently fitted with a shield to protect the crew when engaging ground targets.
- 8.8 cm KwK 36: The main gun of the PzKw VI Ausf. E (Tiger I) tank. Despite its designation, some classify it as a parallel development with very similar specifications rather than a derivative of the Flak 36.
- 8.8 cm Flak 37: It was an updated version of the Flak 36, the main difference being Übertragungser 37 (a data transmission system). It was produced by Krupp.
Guns using the 88×855R mm cartridge
- 8.8 cm Flak 41: This was a weapon developed and produced by Rheinmetall-Borsig to be used with an 855 mm cartridge case. It was fitted to the existing Sonderanhänger 202 as standard and entered service in 1943. The barrel was at first designed as three-section with a length of 74 calibers, and then redesigned to dual-section with a length of 72 calibers.
Guns using the 88×822R mm cartridge
- 8.8 cm Gerät 42: Was a new Krupp design to compete with the Flak 41; it did not enter service as an anti-aircraft gun. Further development of the weapon led to the Pak 43 anti-tank gun.
- 8.8 cm Pak 43: An anti-tank model developed from Krupp's 8.8 cm Gerät 42. With a new gun carriage, the Sonderanhänger 204 was developed by Krupp and manufactured in different versions, including the KwK 43, by at least Dortmund Hoerder-Hüttenverein, Henschel, Weserhütte and Fr. Garny. It had a 71 caliber barrel and an 822 mm cartridge case.
- 8.8 cm Pak 43/41: The Pak 43 was mounted on a single axle split-trail field gun carriage which was produced as a stop-gap measure due to the scarcity of materials. Its weight was 4.9 tonnes.
- 8.8 cm Pak 43/1: The Pak 43 mounted in the Nashorn tank destroyer.
- 8.8 cm Pak 43/2 The Pak 43 mounted in the Ferdinand/Elefant tank destroyer. It was occasionally referred to as the "StuK 43/1", the abbreviation standing for Sturm-Kanone (assault gun).
- 8.8 cm Pak 43/3 and 43/4: The Pak 43 mounted in the Jagdpanther tank destroyer. It had a falling wedge breech block.
- 8.8 cm KwK 43: The Pak 43 modified as a tank gun. It was the main gun of the Tiger II heavy tank. It also had a falling wedge breech block.
The following museums include 8.8 cm Flak guns in their collections.
- Imperial War Museum Duxford, Duxford, UK
- Imperial War Museum, London, UK
- United States Army Air Defense Artillery Museum, Fort Sill (Oklahoma), USA (Flak 18, Flak 36, Flak 37, Flak 41, 8,8cm Flak M39(r))
- Canadian War Museum, Ottawa, Canada
- Deutsches Panzermuseum, Munster, Germany
- Aviation Museum Hannover-Laatzen, Germany
- Le Grand Bunker "Musée du Mur de l´Atlantique", Ouistreham, France
- Liberty Park, Overloon, Netherlands
- Ilmatorjuntamuseo, Hyrylä, Finland
- Museo Histórico Militar, A Coruña, Spain
- National Military Museum, Romania, Bucharest
Flak 37 gun, on display at the Deutsches Panzermuseum, Munster, Germany
Flak 37 gun, on display at the Anti-aircraft Museum in Hyrylä, Finland
Weapons of comparable role, performance and era
- Bofors 75 mm Model 1929 : 75 mm and 80 mm Swedish gun developed alongside the 88 at Bofors
- QF 3.7-inch AA gun : contemporary British anti-aircraft gun, firing a heavier (28 pounds (13 kg)) shell
- Cannone da 90/53 : contemporary Italian anti-aircraft gun
- 90 mm Gun M1 : contemporary US anti-aircraft gun
- 85 mm air defense gun M1939 (52-K) : contemporary Soviet anti-aircraft gun
- In German, the comma is used as the decimal separator, hence official punctuation was actually "8,8 cm" and not "8.8 cm". The spoken version was Acht-komma-acht Zentimeter.
- Also many sources say Flak is a contraction of Flugabwehrkanone or Fliegerabwehrkanone or Flugzeug-Abwehr-Kanone. In all cases, including the latter, the letter "k" in "Flak" was not capitalized.
- The Allied slang for anti-aircraft fire, ack-ack, does not come from the Acht-acht, but is World War I signalers' phonetic spelling of letters "AA".
- The light anti-aircraft battalion usually did not deploy any 8.8cm Flaks, the heavy battalions were rarely used in practice.
- "Lexikon der Wehrmacht - Flugabwehrwaffen (Flak)"
- TM E9-369A: German 88-mm Antiaircraft Gun Materiel. Technical Manual, War Department, June 29, 1943
- W. Biedermann (1923). Die deutsche Sprache als Spiegel deutscher Kultur. Frommannsche Buchhandlung. p. 38. "Flak (Flugzeugabwehrkanone)"
- Oberkommando des Heeres H.Dv.481/541 - Merkblatt für die Munition der 8,8 cm Flugabwehrkanone 18 (8,8 cm Flak 18) und der 8,8 cm Flugabwehrkanone 36 (8,8 cm Flak 36); Berlin: Oberkommando des Heeres, 1942.
- Wilhelm Oppermann, 1928.
- A Dictionary of Great War Slang by Paul Hinckley
- Westermann, Edward B. (2005–2009) . Flak: German Anti-aircraft Defenses 1914-1945. Modern War Studies. University Press of Kansas. pp. 19, 36–38, 44, 53, 58, 83, 90, 108, 128–129. ISBN 9780700614202.
- Chow, Roy  Troy, MI, 06 Feb 2012. Retrieved on 08 Oct 2014.
- Chow, Roy  Troy, MI, 06 Feb 2012. Retrieved on 08 Oct 2014.
- Norris, John (2002-01-01). 88 Mm FlaK 18/36/37/41 & PaK 43, 1936-1945: 1936 - 45. p. 15. ISBN 9781841763415.
- "German Weapon and Ammunition Production"
- Penetration of the Pzgr. 39 ammunition against a 30-degree sloped steel plate: http://www.panzerworld.net/armourpenetration
- Hans Von Luck (1989). Panzer Commander, Dell Books. pp 193-198. ISBN 0-440-20802-5
- “Kalibar” br.106 iz avgusta 2005.godine
- Williams, Anthony G. "78- 100 MM CALIBRE CARTRIDGES". AMMUNITION DATA TABLES. Retrieved 30 July 2011.
|This article needs additional citations for verification. (April 2014)|
- Chant, Christopher. Artillery of World War II. London: Brown Partworks, 2001. ISBN 1-84044-088-0.
- Gander, Terry, and Peter Chamberlain. Weapons of the Third Reich: An Encyclopedic Survey of All Small Arms, Artillery and Special Weapons of the German Land Forces 1939–1945. New York: Doubleday, 1979. ISBN 0-385-15090-3.
- Hogg, Ian V. German Artillery of World War Two. 2nd corrected edition. Mechanicsville, Penn.: Stackpole Books, 1997. ISBN 1-85367-480-X.
- Piekalkiewicz, Janusz (translated by Edward Force) (1992). The German 88 Gun in Combat: The Scourge of Allied Armor. Schiffer Military History. ISBN 978-0-88740-341-5.
|Wikimedia Commons has media related to 8.8 cm FlaK 18/36/37/41.|
- History of the 88 mm series of guns[dead link]
- US Military Intelligence document on the 88 mm gun
- The New 88 and Its Carriages
- Detailed examination of the effect of 88 mm FlaK on B-17 and B-24 bombers
- Technical Manual German 88 mm Antiaircraft Gun Materiel - US War Department, 29 June 1943
- Extract from "Handbuch für den Flakartilleristen" - Die 8.8 cm – Flak 1939