Rauvork's Phantasmagorial Aerial Splendiferousness Enabler

It has long been man's fervent wish to take to the air as the birds do, and this was the inspiration behind this incredible device. After much study of the anatomy and structure of a bird's wings. Rauvork built machine after machine with a singular lack of success. Fortunately, Rauvork was not cursed with the belief that his devices could never fail and attempt his first flights from comparatively low heights. Developments gleaned from rogue Dwarf Engineers' descriptions of Gyrocopters enabled Rauvork to perfect his flying machine to the level where it could travel nearly a hundred yards through the air, but its application was limited due to the fact that the pilot would be exhausted from pedalling frantically to keep the device in the air. Plans for a two-man version of the Aerial Splendiferousness Enabler were proposed, but never built due to the difficulty in finding two people willing to leap from a tall building on such a tempermental device.

Source
pg. 55
 * White Dwarf #296