Nose and dorsal turrets, each carrying a Lewis gun, completed the defensive armament, while the gondola also housed an internal bomb-bay.
The gunsight was hydraulically connected to well-streamlined "pancake"-shaped turrets on the top and bottom of the aircraft.
ARINC 818 lends itself to applications that require few conductors (slip rings, turrets), low weight (aerospace), EMI resistance, or long distance transmission (aerospace, ships).
It was an all-metal, twin-engine, low-wing monoplane with retractable landing gear, and armed with three flexible machine guns, one each in the nose, dorsal turret, and ventral gondola.
Three 7.7 mm (0.303 in) Breda (or Scotti) machine guns were fitted - one in the left wing, one in a dorsal turret and one in the ventral position.
The G.I was a biplane with a crew of three and armament of a single machine gun mounted on a gun ring in the nose of the aircraft.
Gun turrets have been placed in static, land fortifications such as the Maginot Line forts in France and particularly in coastal artillery defences such as Fort Drum, the "concrete battleship", near Corregidor, Philippines.
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However, post-war, the concept fell out of favour due to its limitations, with the Swedish Stridsvagn 103 'S-Tank' and the German Kanonenjagdpanzer being exceptions.
1931 had a twin-turreted configuration and was designed to carry two machine guns, mounting one in each turret.
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'Bustle' was also the term used for an additional external space at the rear a tank's turret used for storing extra equipment, a notable usage being the added box at the rear of the turret on the Sherman Firefly variant.
One of these was fitted with the slightly updated 801L engines and a small power-operated turret on the extreme top of the cockpit mounting a 13 mm (.51 in) MG 131 machine gun.
As Italian troops of the Forli Division advanced into France on 20 June, they were bombarded by Roche-la-Croix's 75mm gun turret, supported by fire from Saint Ours Haut, stopping the advance.
The design of the Type 89 was relatively conventional with a forward-mounted gun turret carrying the main armament, a Type 90 57 mm gun that was complemented by two Type 91 6.5 mm machine guns.