Air defense / Anti-aircraft guns / Bofors L/70

Bofors L/70

General Facts

  • TYPE
    Towed anti-aircraft gun

  • ORIGIN
    Sweden

  • NICKNAMES
    -

  • DESIGNED
    1945 - 1948

  • DESIGNER
    Bofors

  • PRODUCTION
    1951 - present

  • PRODUCERS
    Argentina
    India
    Italy - Otobreda
    Netherlands
    Norway
    Singapore - Allied Ordnance
    Spain - Placencia de las Armas
    Sweden - Bofors
    United Kingdom - RO Defence

  • QUANTITY
    Unknown

  • UNIT COST
    Unknown

  • CHARACTERISTICS
    Very good firepower
    Good effective range
    Optional fire control integration
    Large and heavy

Introduction

The Bofors L/70 is a towed anti-aircraft gun of Swedish origin. It was developed in the late 1940's by Bofors as a successor for the earlier Bofors L/60 which was very successful during World War 2. Compared to the older L/60 the L/70 has a greater effective range and higher rate of fire, making it much more effective against fighter jets. The new L/70 gun has also been used in various naval mounts and serves as the main armament for the CV9040 mechanized infantry fighting vehicle.

Layout

The Bofors L/70 is similar in principle to the earlier L/60 but is much heavier and larger. The L/70 is based on a 4 wheel trailer with two outriggers and two jacks. The single 40mm L/70 autocannon is mounted on a turntable. Some models feature an APU and others are powered externally. The crew of two consists of a gunner on the left and a loader on the right. The guns are normally operated by radar, but for manual fire a SRS 5 sight is fitted. Several upgrade packages are offered to keep the guns up to date. One of them is the BOFI package which adds a radar system above the barrel.

Firepower

The L/70 fires different 40mm rounds than the earlier L/60. The new rounds are slightly lighter and have a much higher velocity. The latest upgrades include the 3P proximity fuze ammunition. The rounds are loaded in 4 round clips, although most systems are fitted with a 26 round hopper. The cyclic rate of fire is 240 rpm and upgrade packages offer 300 rpm. The maximum effective range is 3 to 4 km.

Mobility

The L/70 is mounted on a four wheel chassis and is usually towed by a 6x6 truck, which may also carry additional ammunition and the crew. In case of emergency the L/70 may be fired from its wheels with much reduced effectiveness. The emplacement and displacement time are several minutes.

Users

The L/70 was used by many Western nations and was widely exported to Asia, the Middle East, Africa and South America. The L/70 remains in widespread use although many systems have been replaced by surface to air missiles or are relegated to a secondary role.

Variants

L/70

The Bofors L/70 is a towed single barrel anti-aircraft gun. The system is based on a 4 wheel chassis that is fitted with four outriggers. A single 40mm L/70 autocannon is fitted on a turntable. A gun shield is fitted on the front and the side and ammunition is stowed behind the two operators. Elevation and traverse are powered. The L/70 Type A is powered from an external source and the Type B by an auxiliary power unit on the carriage.

TypeTowed anti-aircraft gun
Crew2 on weapon
Ordnance40x346mm L/70 autocannon
Elevation-4 to +90°, 45/°s
Traverse360°, 85°/s
Rate of fire240 - 260 rpm cyclic
Range3 to 4 km vs aircraft
Carriage4 wheel carriage with two outriggers and two jacks, 4.03 m wheelbase, 1.8 m track, 0.39 m ground clearance
Weight4.8 t
Length7.29 m (travelling)
Width2.23 m (travelling)
Height2.35 m (travelling)
Towing vehicle4x4 or 6x6 truck
Speed?
RemarksSRS 5 sight, external power required
TypeTowed anti-aircraft gun
Crew2 on weapon
Ordnance40x346mm L/70 autocannon
Elevation-4 to +90°, 45/°s
Traverse360°, 85°/s
Rate of fire240 - 260 rpm cyclic
Range3 to 4 km vs aircraft
Carriage4 wheel carriage with two outriggers and two jacks, 4.03 m wheelbase, 1.8 m track, 0.39 m ground clearance
Weight5.15 t
Length7.29 m (travelling)
Width2.23 m (travelling)
Height2.35 m (travelling)
Towing vehicle4x4 or 6x6 truck
Speed?
RemarksSRS 5 sight, APU fitted

L/70 REMO

The L/70 REMO is an original L/70 fitted with the Renovation and Modernization package offered by Bofors. This includes a full overhaul and various upgrades that include a higher rate of fire, new fire control system and air burst programmer and ammunition. The new sight and fire control computer are the UTAAS, which is also fitted to the CV 90 mechanized infantry fighting vehicle. The air burst ammunition is of the 3P type. The L/70 REMO in Dutch service lack the UTAAS sight but are fitted with a diesel APU and Flycatcher fire control integration.

TypeTowed anti-aircraft gun
Crew2 on weapon
Ordnance40x346mm L/70 autocannon
Elevation-4 to +90°, 45/°s
Traverse360°, 85°/s
Rate of fire300 rpm cyclic
Range3 to 4 km vs aircraft
Carriage4 wheel carriage with two outriggers and two jacks, 4.03 m wheelbase, 1.8 m track, 0.39 m ground clearance
Weight5 t
Length7.29 m (travelling)
Width2.23 m (travelling)
Height2.35 m (travelling)
Towing vehicle4x4 or 6x6 truck
Speed?
RemarksUTAAS sight, APU fitted

L/70 BOFI

The L/70 BOFI, or fair weather BOFI, is an L/70 upgraded with the Bofors Optronic Fire-control Instrument (BOFI). This package includes an electro-optical fire-control system and proximity fuzed ammunition. The fire-control system also includes a computer and laser range finder. Since it is of little use in adverse weather it is called a fair weather system.

TypeTowed anti-aircraft gun
Crew2 on weapon
Ordnance40x346mm L/70 autocannon
Elevation-4 to +90°, 45/°s
Traverse360°, 85°/s
Rate of fire240 - 260 rpm cyclic
Range3 to 4 km vs aircraft
Carriage4 wheel carriage with two outriggers and two jacks, 4.03 m wheelbase, 1.8 m track, 0.39 m ground clearance
Weight5.5 t
Length7.29 m (travelling)
Width2.23 m (travelling)
Height2.35 m (travelling)
Towing vehicle4x4 or 6x6 truck
Speed?
RemarksBOFI sight, APU fitted

L/70 BOFI-R

The L/70 BOFI-R, or all weather BOFI, is an L/70 with the same BOFI upgrade and the addition of a radar system above the barrel and a laser range finder. The BOFI-R can be used in all weather situations and can effectively engage fast moving targets out to 4 km without external radar input.

TypeTowed anti-aircraft gun
Crew2 on weapon
Ordnance40x346mm L/70 autocannon
Elevation-4 to +90°, 45/°s
Traverse360°, 85°/s
Rate of fire240 - 260 rpm cyclic
Range3 to 4 km vs aircraft
Carriage4 wheel carriage with two outriggers and two jacks, 4.03 m wheelbase, 1.8 m track, 0.39 m ground clearance
Weight5.7 t
Length7.29 m (travelling)
Width2.23 m (travelling)
Height?
Towing vehicle4x4 or 6x6 truck
Speed?
RemarksBOFI sight, BOFI radar, APU fitted

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