The Plate-class was a type of Culture Systems Vehicle.
The physical hull of a Plate was over 50 km long and 20 km wide, with a height of 4 km.
The top kilometre was the accommodation section for biological passengers. The flat portions of the top area have a combined surface area of 800 km2.
The middle two kilometres were docks and construction yards for spacecraft.
The lower kilometre was engineering space, primarily for engines.
With an external multiple-layer field-complex could reach 90 to 100 km.
One example had a operational mass of about six trillion tonnes.
The hyperspacial aggregation motors of an average Plate of the 19th century CE could sustain an indefinite cruise speed of 104 kc; the designed maximum acceleration was 0.72.
Plates were normally run by three Minds.
A Plate biased toward ship construction could have a Real population of 250 million.
Plates were in service by the Idiran-Culture War of the 14th century CE.
The Plate-class Sleeper Service gained notoriety for its actions leading up to and during the Esperi Excession crisis of the 19th century CE; it became known as the quintessential example of a Culture ship feigning Absconder or Eccentric status to mask Special Circumstances activities.
The class continued to serve as General Systems Vehicles through the c. 29th century CE.