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155mm Bofors FH77



Overview


FH77 B02

Forward view of FH77 B02.
Source: Bofors - © copyright lies with original owner

Origin
Sweden
Type
Towed howitzer
Entered service
Late 1970's
Status
In service
Development
Early to mid 1970's
Developer
Sweden - Bofors
Production
1978 - 1984
Producer
Sweden - Bofors
Number produced
About 720
Designations
Haubits 77 (Swedish service)
Field Howitzer 77 (English designation)
Notable users
Sweden
India

Description


Introduction

The FH77 is a late Cold War era towed howitzer of Swedish origin. It was developed in the early 1970's as highly mobile towed alternative to self-propelled howitzers, such as the M109. At the time of development the FH77 was the most sophisticated towed howitzer due to its high level of automation. It also was the first towed howitzer to feature an auxiliary power unit for autonomous movement.

Layout

The FH77 uses a split trail carriage with castor wheels. An APU is mounted between in front of the axle. The 155mm 39-caliber ordnance features a pepperpot or double baffle muzzle brake. A HIAB crane and power rammer aid in loading the 155mm shells and related charges. The minimum crew consists of a commander, gunner and two loaders. A typical crew consists of 10 to 14 men, including the crew of the towing vehicle.

Firepower

The FH77 fires both its own range of 155mm shells and NATO compliant ammunition. The maximum range is 21 km with regular ammunition and over 27 km with base bleed ammunition. The high level of automation results in a high rate of fire. When using semi-fixed ammunition three rounds can be fired in 8 seconds, and six rounds can be fired in 25 seconds. NATO standard ammunition is fired at a lower rate of fire. Sustained rate of fire is 3 rpm for 20 minutes.

Mobility

The FH77 is towed over long distances by the Scania SBA111 6x6 truck. The APU allows the FH77 to move autonomously over short distances, even in the field. The FH77 is too heavy to be man handled. The high level of automation results in a limited emplacement time compared to others in its class.

Users

The FH77 was adopted by Sweden in 1978 and remains in service today. The FH77 was exported to a several other nations. India is the best known user, both for acquiring over 400 guns and the political scandal related to the acquisition. Replacement in Indian service was planned, but overhaul and upgrade programmes are now underway.

Variants


FH77/A

Side view of FH77 in travel configuration.
Source: Mick - © GNU Attribution - Share Alike license

The FH77 is a highly capable 155mm towed howitzer. The hydraulic crane and high level of automation allow for a high rate of fire. The FH77 is easily identified since it is one of the few single axle towed howitzers equipped with an APU. Over time a small number of variants was developed.

List of FH77 variants

FH77/A
Baseline production model with sliding block breech.
FH77/B
Export model with interrupted screw breech.
FH77 B02
Indian upgrade of FH77/B with 45-caliber ordnance and improved electronics.
FH77 B05
Proposed upgraded similar to B02, but using a 52-caliber ordnance.

Details


Facts FH77
General
Origin
Sweden
Type
Towed howitzer
Crew
5 to 14
Dimensions
Weight
11.5 t
Length
11.60 m (firing position)
Width
9.73 m (firing position)
Ordnance
Type
155mm L/38 howitzer
Barrel length
5.89 m
Muzzle brake
Pepperpot in FH77/A
Double baffle in FH77/B
Muzzle velocity
300 to 770 m/s
Elevation
-5 to +50°
Traverse
30° left and right
Firepower
Rate of fire
3 round burst in 8 seconds
6 round burst in 25 seconds
3 rpm sustained for 20 minutes
Range
21.0 km (standard rounds)
27.4 km (ERFB-BB rounds)
Carriage
Type
2 wheel split trail carriage
2 castor wheels
Limber
No
Gun shield
No
Mobility
Towing vehicle
6x6 truck
Towed speed
70 to 80 km/h on roads
Autonomous mobility
8 km/h using APU
APU
Yes

Media


Related articles


Archer

The Archer is a self-propelled howitzer on an articulated wheeled chassis. The L/52 howitzer is derived from the towed FH77.

155mm FH-70

The FH77 looks quite similar to the FH-70.

Scania SBAT 111S

In Swedish and Indian service the FH77 is towed by an artillery tractor based on the Scania SBAT 111S 6x6 tactical truck.