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M777 Portee

155 mm howitzer

M777 Portee

The M777 Portee uses a revolutionary M777 howitzer adopted by the US Army

 
 
Country of origin United Kingdom
Entered service -
Crew 6 men
Dimensions and weight
Weight 12.3 t
Length (gun forward) ?
Hull length ?
Width ?
Height ?
Armament
Main gun 155 mm howitzer
Barrel length 39 calibers
Machine guns ?
Projectile weight ?
Maximum firing range 30 km
Maximum rate of fire ?
Elevation range ?
Traverse range ?
Ammunition load
Main gun 20 / 71 rounds
Mobility
Engine diesel
Engine power ?
Maximum road speed ~ 80 km/h
Range ~ 600 km
Maneuverability
Gradient 60%
Side slope 30%
Vertical step ~ 0.6 m
Trench 0.6 ~ 1 m
Fording ~ 0.8 m

 

   The M777 Portee was developed by BAE Systems as a private venture to meet a British Army requirement for LIMAWS (G) or Lightweight Mobile Artillery Weapon System - Gun program. Another contender for the LIMAWS (G) program was the GIAT Industries CAESAR 155 mm/L52 artillery system based on a 6x6 truck chassis.

   The first prototype of the M777 Portee was completed in 2005. It is an intermediate design between towed and truck-mounted howitzers. UK requirement was for 30-40 artillery systems of this class. Unfortunately the LIMAWS (G) program was canceled in 2007 due to funding problems. The British Army will continue to rely on AS90 self-propelled howitzers and light guns until these will be replaced by 2023.

   The M777 Portee uses a revolutionary M777 155 mm/L39 lightweight field howitzer, adopted by the US Army, US Marine Corps, and a number of other countries. Maximum range of fire is 30 km with rocket-assisted projectile. This howitzer also fires Excalibur precision guided extended range projectiles with a maximum range of 40 km. Intense rate of fire is 5 rounds per minute, sustained rate is 2 rounds per minute.

   The M777 Portee was extensively evaluated by the UK MoD and over 350 rounds were fired in test conditions.

   The M777 field howitzer is partially unloaded from the vehicle before firing. A total of 20 rounds of ammunition are carried by the vehicle. The advantage of such design is that the M777 Portee is more mobile than ordinary towed howitzers. Also when the howitzer is loaded onto the vehicle it can go over difficult terrain, that would trap other towed howitzers. Unique feature of the M777 Portee is that artillery system can be easily removed or attached to the chassis. With the howitzer removed the vehicle acts as an artillery tractor and can carry additional ammunition instead of artillery system. In the towing mode the M777 Portee can carry a total of 71 rounds.

   Cab of the M777 Portee provides light armor protection and NBC protection for the crew. It accommodates the driver plus the gun crew of 5 men.

   The M777 Portee is based on a Supacat HMT 800 8x6 high mobility truck chassis. Vehicle can be carried by a C-130 transport aircraft. Also it can be carried underslung by two CH-47 Chinook helicopters.

 

Video of the M777 Portee artillery system

 
M777 Portee

M777 Portee

M777 Portee

M777 Portee

M777 Portee

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