Hoverbout

Hoverbouts — also spelled as hovabouts and also known as transolar discs — were small circular flying platforms with a railing around the edge, used by Daleks for operation within a planetary atmosphere, in close planetary orbit and within close to medium range of a Dalek spacecraft.

On Skaro several styles of hoverbout were used to patrol the planet and the monitor events close to spacecraft. (COMIC: Legacy of Yesteryear)

The Daleks made use of transolar discs for patrol during the 22nd century Dalek invasion of Earth. (AUDIO: Masters of Earth) A Dalek assassination squad sent in a Dalek time machine to kill the First Doctor and his companions used hoverbouts to obtain a better view of the Aridian desert. (PROSE: The Chase)

The Dalek invasion fleet preparing in the hangar to destroy the solar system with the Time Destructor was monitored from air on Kembel by Daleks in hoverbouts. (PROSE: The Mutation of Time)

Daleks aboard transolar discs were used to patrol around Dalek-held planets and in groups to attack spacecraft. (AUDIO: The Human Factor) They were also used to attack the enemy human forces attempting to breach the Dalek-held facility Project Infinity on Lopra Minor. (AUDIO: Project Infinity)

In an alternate timeline, President Nigel Rochester owned a functioning transolar disc, which he used to take the Sixth Doctor on an aerial tour of London. The vehicle was later destroyed by Rochester, who claimed that it was "bugged" with a listening device. (AUDIO: Jubilee)

Transolar discs were used during the Last Great Time War. (PROSE: A Prologue) Hoverbouts were used to travel beneath the crust of Gallifrey during the First Segment of the War. (PROSE: The Stranger)

Transolar discs were salvaged during a war between Daleks and humans and were investigated at Station 7. (COMIC: The Only Good Dalek)

Aqua-Dalek units used underwater version of hoverbouts to destroy a submarine used by the Eleventh Doctor and his companions. (COMIC: The Dalek Project)

The Daleks used hoverbouts to escape the destruction of a Voord spaceship, follow an escape capsule containing the First Doctor and the Chief Voord to a South American jungle, and battle Earth fighters. (PROSE: Doctor Who and the Daleks)

Behind the scenes

 * The object was seen only on screen in More Than Thirty Years in the TARDIS.
 * The Into the Dalek set includes Black Dalek with a black hoverbout.
 * The Doctor Who Time Zone Playset Dalek Invasion 2075AD includes a Dalek with a Hoverbout.
 * Daleks aboard transolar discs are featured on both the cover art as well as in the animated YouTube trailer for Big Finish Productions' audio anthology, Only the Monstrous and in The Shadow Cage