DEU - MG FF (20 mm kanón)

Original name:
Original Name:
MG FF "Flügel Fest"
Ikaria, Gesellschaft für Flugzeugzubehör mbH, Berlin [img_6 comment = Německo (DEU)][/img_6]/[ url=/category/view/505124/] [img_6 comment = Great German Empire (1943-1945)]]
Production period:
Production Period:
Made pieces:
Number of Produced:
Prototype produced:
Prototype Built:
He 112 B-1
Bf 109 E-3
Bf 110 B-1 C-1
FW 200 C-3
He 111 H-6
In night fighters like "Schräge Musik".
Technical data:
Technical Data:
28 kg 58 lb
20 mm/0.79 inch
Barrel length:
Barrel Length:
822 mm 2ft 8,36in
Overall length:
Overall Length:
1338 mm 4ft 4,68in
Ammunition used:
Ammo Used:
piercing - 115 g
all types of ammunition were with or without tracer
all with or without tracer
Maximum range:
Maximum Range:
0.6 - 0.8 km 0.4 - 0.5 mi
Shooting speed:
Rate of Fire:
520 rounds 520 rpm
Muzzle velocity:
Muzzle Velocity:
585 m/s 1919.3 ft/s
There were two variants:
MG FF (A) with mechanical trigger, for movable mounting, the trigger operated by the shooter.
MG FF (B) with electric launcher, designed for fixed installation.

The supply of the cannon ammunition was carried out from a short in-line magazine for 15 grenades or from drum magazines with a capacity of 30, 45, 60, 75 and 100 rounds.
The weight of the empty drum magazine for 60 grenades 8.2 kg, full weighed 20.3 kg.
A more efficient Minengeschoss ammunition was developed for the MG FF cannon, which gave rise to the modernized MG FF/M (ammunition was not interchangeable). Both types of MG FF and MG FF/M cannons were mounted in fighter aircraft as fixed weapons, when installed in the wing of the aircraft caused problems quite a large drum magazine. For aircraft Fw 190 A-1 to A-5 was the usual combination of modern cannons MG 151/20 with MG FF cannons and more often with MG FF/M, but it is true that the MG FF and MG FF/M cannons were often dismantled for units to save weight. This weapon also had its comeback, in the years 1942 - 1943 it was mounted on the fuselages of night fighters such as Schräge Musik.
The 0.79in MG-FF cannon has been created by firm "Erlicon". It was applied in wing and turret variants.
Wing cannon had ammunition load on 60 or 100 cartridges, turret - on 15 or 30 or 45 cartridges.
The MG FF and FF/M saw widespread use in fighters such as the Bf 109 E-3 to F-1, Bf 110 C to F, and Fw 190 A-1 to A-5. The Fw 190 was typically fitted with an inboard pair of MG 151 and an outboard pair of MG FF, although the MG FF were sometimes removed in the field in order to save weight.The cannon was also fitted to bombers such as the Do 217, Ju 88, He 111, Do 17, as well as many other aircraft. Although the MG FF was often replaced with the 0.79 in MG 151/20 from 1941 onwards, it saw a come-back in 1943 as the primary Schräge Musik gun in the Bf 110 night fighters, as it perfectly fitted into the rear cockpit.
author's archive
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Oerlikon FF 20 mm cannon

It is an aircraft cannon with a simple conclusion manufactured by Oerlikon and used by the Luftwaffe since 1935. It is a weapon that was already suitable for the armament of aircraft of various types.

This cannon had an unlocked conclusion with the so-called pre-fire. The principle of its operation was based on the fact that the charge (with an almost cylindrical cartridge case) was finally inserted into the charge chamber of the stationary barrel and during this forward movement was initiated. Thus, at the beginning of the movement of the projectile in the barrel, part of the energy impulse of the shot first had to be used to stop the breech, and only the remaining part then pushed the breech back. The use of pre-ignition thus made it possible to significantly reduce the weight of the breech, due to its lower stress by firing pressures and shocks. It was important that there was less stress on the cannon and the transmission of missiles to the entire structure of the aircraft. The forces and shocks acting in the barrel during the shot were not transmitted to the aircraft, but only the forces of the springs, which the breech compressed during its retraction. However, this principle also had certain disadvantages, such as a relatively low muzzle velocity.
The supply of cannon ammunition was carried out from drum magazines for 45, 60, 75 and even 100 rounds. It was simple in construction, but the drum magazines took up quite a bit of space. This made the method of mounting difficult.
A very interesting installation in aircraft was the storage of these cannons in a system called "Schräge Musik" used in heavy fighters. The cannons were installed in the fuselage (mostly behind the cabin) and fired obliquely upwards. This was to be used to shoot down enemy bombers as they flew beneath them.

Example of ammunition used:

20 mm incendiary-illuminating

Cartridge weight: 183 g
Bullet weight: 115 g
Dust weight: 13.3 g
Hub length: 147 mm
Muzzle velocity: 585 m/s

- L. Popelínský, Aircraft Rifle and Missile Armament, Our Army 1997, ISBN 80-206-0531-2
- J. Schmid, Aircraft 1939-45 (Germany 1/2), Jiří Fraus 1993, ISBN 80-85784-02-5/80-85784-10-6
- author's archive
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Source: wikipedia
DEU - MG FF (20 mm kanón) - zabudovaný v bf 109

zabudovaný v bf 109
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