Warp coil
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In the fictional universe of Star Trek, a warp coil is a component of the warp drive. They are also known as warp field coils. For Federation vessels, warp coils are usually housed in nacelles.
Warp field coils are asymmetrically placed units that propel the starship into warp flight. Depending on the geometry of the warp field projected around the ship, these coils create a pulsating field when injected with a controlled plasma burst, pushing to the rear of the vessel, propelling the ship forward in a controlled rate.
