OT3 Self-Propelled Howitzer
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| RDA OT3 SPG | |
|---|---|
 An Imperial Fusilier OT3 deployed in the Kurilla Mountains during the Zemplen War. | |
| Type | Self-propelled artillery |
| Place of origin |  Ruvelka |
| Service history | |
| In service | 1999 – Present |
| Used by | Ruvelka |
| Wars | Imerti Conflict Zemplen War |
| Production history | |
| Manufacturer | Ruvelkan Defense Administration |
| Produced | 1990 – present |
| No. built | ~900 |
| Specifications | |
| Weight | 47 tonnes |
| Length | 12 m |
| Width | 3.4 m |
| Height | 2.7 m |
| Crew | Commander, driver, gunner, 2 loaders |
| Shell | Separate loading, bagged charge |
| Caliber | 155 mm L/39 |
| Breech | Interrupted screw |
| Traverse | 360° |
| Rate of fire | 6 rpm |
| Maximum firing range | 18 km (HE) 30 km (HE-RAP) 36 km (BB/DP-ICM) 40 km (BB/HE) 52 km (HE-RAP) |
Main armament | RDA Heavy 155mm howitzer |
Secondary armament | Vitali MG50 (12.7×99mm) |
| Engine | RDA MT 881 K500 8-cylinder water-cooled diesel engine 746 kW (1000 hp) |
| Power/weight | 21 hp/tonne |
| Suspension | Hydropneumatic |
Operational range | 480 km |
| Speed | 67 km/h, off-road |
The RDA OT3 SPG is a Ruvelkan armored self-propelled 155 mm howitzer designed and developed by the Ruvelkan Defense Administration for the Imperial Armed Forces of Ruvelka. The OT3 was developed in the 1990s as part of an effort to expand on Ruvelka’s aged artillery arsenal, a comparatively weak practice in comparison to its historical rival in Syara. Entering service in 1999, units of OT3s were deployed as part of the Imerti Conflict and saw extensive use during the Zemplen War. OT3s are the only howitzers deployed by both the Imperial Army and the Imperial Fusiliers.