L70 Total gun barrel weight: 68.04 kilograms (150.0 lb) Minus breech mechanism: 20.865 kg (46.00 lb) L85 Empty: 92.0 kilograms (202.8 lb) Loaded with 200 rounds: 182.0 kg (401.2 lb)
Length
L70 Overall: 2,210 mm (87 in) Barrel length: 1,400 mm (55 in) L85 Overall: n/a Barrel length: 1,700 mm (67 in)
Shell
L70: 20×110mmRB L85: 20×128mm
Shell weight
HE: 123 g (4.3 oz) HE/T: 116 g (4.1 oz)
Caliber
20 mm (0.787inch)
Barrels
Single barrel (progressive RH parabolic twist, 9 grooves)
Action
API blowback
Elevation
Manual, -15°/+90°
Traverse
Manual, full 360°
Rate of fire
L70: Cyclic: 450 rounds per minute Practical: 250-320 rounds per minute L85: Cyclic: 900 to 1,000 rounds per minute
Muzzle velocity
L70: 820 m/s (2,700 ft/s) L85: 1,050 m/s (3,400 ft/s)
Effective firing range
Against low-flying aircraft (HE round) L70: 914 m (1,000 yd) L85: 1,500 m (1,600 yd)
Maximum firing range
HE round at 45° L70: 4,389 m (4,800 yd) L85: 6,800 m (7,400 yd)
Feed system
Cylindrical magazine holding 60 rounds, Later adjusted to be a belt fed gun
The Oerlikon 20 mm cannon is a series of autocannons based on an original German Becker Type M2 20 mm cannon design that appeared very early in World War I. It was widely produced by Oerlikon Contraves and others, with various models employed by both Allied and Axis forces during World War II. Many versions of the cannon are still used today.[2][3]
^Budge, Kent G. (2014). "20mm Oerlikon Light Antiaircraft Gun". The Pacific War Online Encyclopedia. Retrieved 30 May 2019.
^"Switzerland Oerlikon 20 mm/70 (0.79") Mark 1"". NavWeaps.com. 14 January 2011. Retrieved 24 September 2011.
^"Britain 20 mm/85 (0.79") GAM-BO1". NavWeaps.com. 21 June 2008. Retrieved 23 October 2011.
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