Torsion plate

From Halopedia, the Halo wiki

Torsion plates are a form of slower-than-light maneuver drive system employed almost ubiquitously aboard Forerunner starships. The plates convert harvested vacuum energy into a form of inertia-less thrust (presumably torsion fields),[1] and are considered so simple and widely applicable they are near-universally used across the Forerunner fleet. Other forms of propulsion are used, though they are generally used for an extremely specific niche or aesthetic purposes.[2] Stores of exotic matter may be used as reaction mass by torsion plates, allowing them to accelerate at a higher rate.[3]

Supernal Spiral-class keyships such as Anodyne Spirit are equipped with torsion drivers,[4] as are more terrestrial (though still floating) structures such as skydocks. The accuracy and precision required of atmospheric maneuvering makes torsion plates practically a required feature for any atmospheric flight.[2]

The Wings of Malygus, the maneuver drives of Forerunner origin used to move the city-station High Charity around,[5] were likely torsion plates - owing to the city-station's construction around the remains of a derelict Fortress-class vessel.[6] The Covenant's own repulsor engines and boosted gravity propulsion drives are considered a rudimentary step between standard fusion drives and fully-utilising torsion drives.[7]


  1. ^ Halo Waypoint, The New Halo Encyclopedia is Out Today: "TORSION PLATE - Forerunner subluminal drive that converts vacuum energy directly into thrust." (Retrieved on Dec 19, 2022) [archive]
  2. ^ a b Halo Encyclopedia (2022 edition), page 338
  3. ^ Halo: Warfleet, page 93
  4. ^ Halo: Warfleet, page 84-85
  5. ^ Halo: Warfleet, page 56-57
  6. ^ Halo Encyclopedia (2022 edition), page 226-227
  7. ^ Halo Waypoint Forums, Catalog Interaction: "This is a rudimentary technology [bridge] to refined application of [twist-torsion] impulse plates for [high-thrust] travel usable outside of the supporting [lattice] of a planet's gravity well." (Retrieved on Oct 13, 2014) [local archive] [external archive]