The Tiger Moth was a solar yacht active in the 26th century. It was funded by a small syndicate of rich, powerful and well-connected people: Zorelle, a famous fashion designer; Mari, the daughter of the president of Valeria; Nikos, a young businessman; and Kurt, another wealthy businessman.
Tiger Moth was intended to take part in a solar yacht race. It used solar sails which were extended and manipulated by a crew using virtual reality and captained by Lisa Deranne. Kurt was a crew member.
While it was berthed at Space Station Alpha, a Rutan known as Karne stowed away on the Tiger Moth seeking to avoid the Sontarans pursuing him. However, Commander Steg pursued the Tiger Moth on a Sontaran War-Wheel. It fired on the solar yacht, severely damaging its solar sails. During the confrontation with the Sontarans and Karne's attempt to hide, all of the Tiger Moth's crew was killed by Karne except Lisa Deranne and Kurt.