SSPH Primus
1021430
216558244
2008-06-02T05:00:43Z
Rifleman 82
1255637
{{Singapore-designed weapons}}
{{Infobox Weapon
|name=SSPH Primus
|image=[[image:Primus_1.jpg|300px]]
|caption=SSPH 1 on display at [[Marina South]] for the [[National Day Parade, 2005]] celebrations
|type=[[Self-propelled artillery]]
|origin={{flagcountry|Singapore}}
|service=[[2002]]-Present
|is_vehicle=yes
|length=6.6 m (Chassis), <br>10.21 m (With Turret Cannon)
|width=2.8 m (Chassis), <br>3.0 m (With Turret Cannon)
|height=3.28 m
|weight=28.3 tonnes combat loaded
|suspension=[[torsion-bar]]
|speed=50 km/h
|vehicle_range=350 km
|primary_armament=155 mm 39 calibre Howitzer
|secondary_armament=1 x 7.62 mm GPMG, <br>2x3 tubes 76 mm calibre SGL
|armour=25 mm [[Aluminium]]
|engine=[[Detroit Diesel Corporation]] DDC [[Series 92|6V 92TA]]
|crew=4 (Gun Commander, Driver, Ammo Loader, Charge Loader)
|engine_power=550 hp
|pw_ratio=19.43 hp/tonne
}}
The '''Singapore Self-Propelled Howitzer 1 (SSPH 1) Primus''' is a [[self-propelled artillery]] unit armed with a 155 mm [[howitzer]]. Developed jointly by the [[Singapore Armed Forces]] (SAF), [[Defence Science and Technology Agency]] (DSTA) and [[Singapore Technologies Kinetics]] (ST Kinetics), it was introduced to the [[Singapore]] Artillery in 2004. ''Primus'' is derived from the motto of the Singapore Artillery ''In Oriente Primus'' ([[Latin]]: "First in the East").
==Production History and Development==
[[Image:SSPH1 PRIMUS.jpg|thumb|left|The SSPH1 Primus.]]
[[Image:Firing primus.jpg|thumb|left|Primus test-firing.]]
The idea for a self-propelled howitzer within the SAF was developed in the early 1990s, with the aim of providing better fire support to the armour brigades in the Combined Arms Divisions. This new weapon system would require the ability to keep pace with the high tempo of armoured operations, while providing the range, firepower and accuracy that the artillery is renowned for. The 155mm self-propelled howitzer was seen as the obvious choice.
The decision to develop the Primus was made after a market survey in 1995 and 1996 of some of the world's best self propelled guns from the United States ([[M109 Paladin]]), Britain ([[AS-90|AS90 Braveheart]]), Japan (Type 75) and Russia (2S3M1) found them either too heavy or too wide for local terrain. They were known to have a lot of fire power, were highly mobile and very survivable but they were also very heavy, mostly in the range of 50 tons, and the SAF needed something lighter. The SAF needed the Primus to weigh less than 30 tons and be no wider than 3 metres, for it to move across bridges and through the local vegetation. Hence the decision was made to develop a completely new [[self-propelled howitzer]].
Leveraging on its experience with designing, developing and producing various towed artillery systems (the [[FH-88]] and [[FH-2000]]) for the SAF, ST Kinetics, together with DSTA began the development of the Primus in earnest in 1996.
By April 2000, the first working prototype was rolled out, using a vehicle chassis adapted from a [[United Defense]] armoured chassis (the ''Universal Combat Vehicle Platform''; UCVP) which includes components from the US [[M109 Paladin]] howitzer, [[M2 Bradley]] IFV & [[M8-AGS]]. The next 2 years saw the system undergo a series of comprehensive tests to ensure that the Primus was able to withstand the rigours that were required of it. As land in Singapore is scarce, firing tests were first done at [[New Zealand|New Zealand's]] [[Waiouru]] live-firing range as part of Exercise Thunder Warrior in February 2004 [http://www.dsta.gov.sg/index.php?option=com_content&task=view&id=3220&Itemid=401][http://www.nzdf.mil.nz/news/publications/defence-update-newsletter/2004/20/default.htm#tsc]. The guns have also participated in Exercise Wallaby at the [[Shoalwater Bay|Shoalwater Bay Training Area]] in [[Queensland]], [[Australia]] [http://www.mindef.gov.sg/imindef/news_and_events/nr/2006/Nov/29nov06_nr.html].
In September 2002, the Primus was officially certified to have met the SAF’s stringent criteria, and then being formally adopted into the SAF.
==Design==
The chassis is based on the proven United Defense [[M109 Paladin|M109 155 mm self propelled howitzer]]. This has been upgraded in a number of key areas and has a new power pack similar to that fitted to ST Kinetics [[Bionix AFV|Bionix infantry fighting vehicle]] (IFV), which is already in SAF service. The use of common subsystems for the Primus and Bionix IFV offers several advantages, including easier training and reduced logistics.
The Primus power pack consists of a [[Detroit Diesel Corporation]] [[Series 92|6V 92TIA]] diesel engine developing 550 hp coupled to a [[General Dynamics]] Land Systems HMPT-500-3EC fully automatic transmission.
The maximum road speed of the Primus is 50 km/h, with an operating range of 350 km, its combat weight is of 28.3 tons allows it to use the SAF 's current military bridging systems. The Primus could be deployed by the future [[Airbus A400M]] Transport aircraft.
The turret is fitted with a locally developed 155 mm/39-cal barrel with a muzzle brake and fume extractor. This meet the NATO Joint Ballistics Memorandum of Understanding. The range of the Primus' gun would depend on the type of projectile and charge combination used, but is probably about 19 km with the old [[M107 (projectile)|M107]] [[high explosive]] (HE) projectile and 30 km with an extended range full bore base bleed projectile. In addition to smoke, HE and illumination projectiles, the locally developed 155 mm cargo round can also be fired.
A semi-automatic loading system is provided to increase the rate of fire and reduce crew fatigue. The fused projectiles is loaded and rammed automatically; the module charges are loaded manually. The Primus has a burst rate of fire of three rounds in 20 seconds and a maximum rate of fire of 6 rounds per min. The bustle mounted magazine holds up to 22 155 mm projectiles.
The digital [[fire control system]] automates the complete projectile loading process and gun laying operation. An ammunition inventory management system keeps track of all on board ammunition as well as ammunition expenditure during firing. The weapon is laid to the target using an automatic fire control system, which includes an on board positioning and navigation system. This can receive target information from the battery or regimental command post. It takes less than 60 seconds to come into action and open fire and 40 seconds to re deploy.
==Additional Specifications==
===Special Features===
*Automatic loading system, enables operation with 4 men crew
*Automated targeting based on [[GPS]] and Datalink
*Datalink system for shared targeting within battalion and information feeding from forward observers.
===Firepower===
*Calibre: 155 mm, 39-calibre
*Maximum range: 30 km with ER projectile
*Rate of fire: 6 rounds/min (maximum rate), <br>3 rounds/20sec (burst rate)
===Mobility===
*Number of road wheel: 7 per side
*Climbing side slope : 31°
==Trivia==
The Primus has quite often been mistaken as artillery being mounted on a Bionix chassis, and in the earlier days of development as a Bionix MBT variant. This was brought about by the fact that the UCVP (which the Primus was based on) bears a superficial resemblance to that of the Bionix and the fact that ST Engineering had indeed at the time been experimenting on a [[Bionix AFV#Prototypes|light tank variant]] of the Bionix[http://www.navy.mi.th/nrdo/jane/dev_m/singapore_studies_May04.jpg].
==See also==
*[[ST Kinetics]]
==References==
* "[http://www.mindef.gov.sg/weapons/sph/ Singapore Armed Forces SSPH website]." Accessed on 22 July 2005.
* Foss C. (2003). ''Jane's Defence Weekly''. 26 November 2003.
{{Singapore-designed weapons}}
{{artillery-stub}}
{{singapore-stub}}
[[Category:Self-propelled artillery]]
[[Category:Weapons of Singapore]]
[[Category:155 mm artillery]]