Editing SSPH Primus (section)

{{Short description|Singaporean 155 mm self-propelled howitzer}}
{{Use dmy dates|date=January 2023}}
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{{Infobox weapon
| name               = SSPH Primus
| image              = SSPH1 PRIMUS.jpg
| image_size         = 300
| caption            = The SSPH1 Primus on static display during Singapore Army Open House 2007
| origin             = [[Singapore]]
| type               = [[Self-propelled artillery]]
<!-- Type selection -->
| is_ranged          = yes
| is_artillery       = yes
| is_vehicle         = yes
<!-- Service history -->
| service            = 2002 - Present
| used_by            = [[Singapore Armed Forces]]
| wars               = 
<!-- Production history -->
| designer           = [[ST Kinetics]]
| design_date        = 1996
| manufacturer       = ST Kinetics
| production_date    = 2000
| number             = 
| variants           = 
<!-- General specifications -->
|length              = Chassis: {{convert|6.6|m|ftin}} <br/>Overall: {{convert|10.21|m|ftin|abbr=on}}
|width               = Chassis: {{convert|2.8|m|ftin|abbr=on}} <br/>Overall: {{convert|3.0|m|ftin|abbr=on}}
|height              = {{convert|3.28|m|ftin|abbr=on}}
| weight             = Combat weight: {{convert|28.3|t|ST LT}}
| suspension         = [[Torsion bar suspension]]
|speed               = {{convert|50|km/h|mph|abbr=on}}
|vehicle_range       = {{convert|350|km|mi|abbr=on}}
<!-- Ranged weapon specifications -->
| cartridge          = [[155&nbsp;mm]] NATO
| caliber            = 155&nbsp;mm 39 calibre
| action             = 
| rate               = Burst: 3 rounds/20 sec<br/>Maximum: 6 rpm<br/>Sustained: 2 rpm
| velocity           = 
| range              = 
|max_range           = {{convert|30|km|mi|abbr=on}} with ER projectile
| feed               = 
| sights             = 
<!-- Artillery specifications -->
| breech             = Full automatic [[Interrupted screw]] with electronic rammer and semi-auto loader
| recoil             = 
| elevation          = -5°/+75°
| traverse           = 360°
<!-- Vehicle specifications -->
| primary_armament   = [[155 mm]] Howitzer gun
| secondary_armament = 1× 7.62 mm [[FN MAG|GPMG]]
| armour             = High-hardness Steel
| engine             = [[Detroit Diesel Corporation]] (DDC) [[Detroit Diesel Series 92|6V 92TA]]
| crew               = 4 (Commander, Driver, Ammo Loader, Charge Loader)
|engine_power        = {{convert|550|hp|kW|lk=in}}
| pw_ratio           = 19.43 hp/tonne
}}

The '''Singapore Self-Propelled Howitzer 1 (SSPH 1) Primus'''<ref>{{Cite web |title=Primus 155mm 39 Caliber Self-Propelled Howitzer / Singapore Self-Propelled Howitzer-1 (SSPH-1) |url=https://www.globalsecurity.org/military/world/singapore/primus.htm |url-status=live |archive-url=https://web.archive.org/web/20210919050819/https://www.globalsecurity.org/military/world/singapore/primus.htm |archive-date=19 September 2021 |website=GlobalSecurity.org}}</ref> is a [[self-propelled howitzer]] armed with a [[155&nbsp;mm]] [[howitzer]]. Developed jointly by the [[Singapore Armed Forces]] (SAF), [[Defence Science and Technology Agency]] (DSTA) and [[Singapore Technologies Kinetics]] (ST Kinetics), it was officially inducted to the [[Singapore Artillery]] in 2004. ''Primus'' is derived from the Artillery motto ''In Oriente Primus'' ([[Latin]]: "First in the East").

At the time of introduction in 2002, SSPH Primus was recognized as the world's lightest 155mm, 39 calibre tracked howitzer of its kind.<ref>{{Cite web|title=DSTA {{!}} DSTA delivers world-s lightest 155mm, 39 calibre tracked howitzer to the SAF|url=https://www.dsta.gov.sg/latest-news/in-the-news/dsta-in-the-news/dsta-delivers-world-s-lightest-155mm-39-calibre-tracked-howitzer-to-the-saf|access-date=7 December 2021|website=www.dsta.gov.sg}}</ref>