FORCETALLY
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Measured figures
Configuration
| Specification | Oerlikon 20 mm cannon | Santa Bárbara Sistemas 155/52 |
|---|---|---|
| Type | Autocannon[source] | Howitzer[source] |
| Place of origin | Switzerland[source] | Spain[source] |
| In service | 1937–present[source] | 2002–present[source] |
| Wars | World War II Nigerian Civil War[source] | — |
Width
Single source2.8 m (9 ft 2 in)[source]
L70 Total gun barrel weight
Single sourceL85 Empty
Single sourceLoaded with 200 rounds
Single sourceMinus breech mechanism
Single sourceL70 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)[source]
Mass
Single source13,500 kg (29,800 lb)[source]
Maximum; Maximum speed
Single source18 km/h (11 mph)[source]
Effective; Against low-flying aircraft (HE round) L70
Single sourceEffective; L85
Single sourceMaximum; HE round at 45° L70
Single sourceMaximum; L85
Single sourceAgainst low-flying aircraft (HE round) L70: 914 m (1,000 yd) L85: 1,500 m (1,600 yd)[source]
HE round at 45° L70: 4,389 m (4,800 yd) L85: 6,800 m (7,400 yd)[source]
Effective; conventional
Single sourceMaximum; rocket-assisted projectile
Single sourceDiesel APU
Single sourceDiesel APU 106 hp (79 kW )[source]
L70: Cyclic · source measurement 1
Single sourceL70: Cyclic · source measurement 3
Single sourcePractical L85: Cyclic
Single sourceL70: Cyclic: 450 rounds per minute Practical: 250-320 rounds per minute L85: Cyclic: 900 to 1,000 rounds per minute[source]
Rate of fire
Single source10 rpm[source]
L70
Single sourceL85
Single sourceL70: 820 m/s (2,700 ft/s) L85: 1,050 m/s (3,400 ft/s)[source]
Bars compare reported quantities only. A larger figure does not make a system better; configurations and test conditions differ.
| Designer | Reinhold Becker[source] | — |
|---|
| Designed | 1935[source] | — |
|---|
| Manufacturer | Oerlikon Oerlikon Contraves[source] | — |
|---|
| Produced | 1937−1995[source] | — |
|---|
| No. built | 124,734[source] | 111[source] |
|---|
| Variants | Oerlikon FF MG FF cannon[source] | — |
|---|
| Shell | L70: 20×110mmRB L85: 20×128mm[source] | Separate loading charge and projectiles[source] |
|---|
| Shell weight | HE: 123 g (4.3 oz) HE/T: 116 g (4.1 oz)[source] | — |
|---|
| Barrels | Single barrel (progressive RH parabolic twist, 9 grooves)[source] | — |
|---|
| Action | API blowback Gas operated, power reserve loading[source] | Hydraulic loader[source] |
|---|
| Elevation | Manual, -15°/+90°[source] | −3° to +72°[source] |
|---|
| Traverse | Manual, full 360°[source] | 40°[source] |
|---|
| Feed system | Cylindrical magazine holding 60 rounds; later adjusted for belt-fed gun[source] | — |
|---|
| Used by | — | Colombia Spain El Salvador[source] |
|---|
| Breech | — | Interrupted screw[source] |
|---|
| Recoil | — | Hydro-pneumatic[source] |
|---|
| Carriage | — | Split trail[source] |
|---|