Ion drive

An ion drive was a type of engine. They characteristically pulsed, allowing K9 to detect one when it was nearby. (TV: Underworld)

The spaceship Shadow had an ion drive system, including an "ion chamber". (TV: Enlightenment)

The spaceship K-NEL was powered by three ion rocket motors. (PROSE: K9 and the Time Trap)

A spaceship which crashed on Earth in 2009 had an ion drive. (COMIC: Monster Hunt)

The exodus ships that left Red Rocket Rising and were subsequently destroyed by the Daleks ran on ion drive engines. When these ships were blown up, "what you [got]" was ionotronic dust. (AUDIO: Blood of the Daleks)

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