Rk-91 Savage
Rk-91 Savage
Manufacturer Soviet Union
Primary users Soviet Union
Status Active
Developed into Rk-92 Savage
Variants Rk-91M Savage
Known Pilots
Sousuke Sagara

The Rk-91 "Savage" is a second generation Arm Slave produced and operated by the Soviet Union. It is the predecessor to the Rk-92 Savage. Despite being old by the start of the series, some are still in use.


After the use of the Rk-89 Shamrock in Afghanistan, in 1990, the more capable Rk-91 Savage was introduced, replacing the earlier AS almost entirely.

Operational History 

The Rk-91 Savage was the frontline AS of the Soviet Union, but the Rk-92 entered service shortly after it. Some pilots prefer the Rk-91 since its diesel piston engine is relatively quiet compared to the howling gas turbine engine of its successor. While the Soviet Union primarily uses the Rk-92 Savage, the Rk-89 Shamrock and the Rk-91 Savage remain in use. In the manga, Sousuke Sagara is seen using an Rk-91 Savage in underground combat.


General characteristics

  • Crew: 1
  • Height: 8.1 meters 
  • Weight: 
  • Power Source: Diesel engine, 890kW/1200hp
Community content is available under CC-BY-SA unless otherwise noted.