Royal Drive is an unauthorized method of FTL propulsion. It operates by channeling the energy released by the interactions of chambers and antechambers into a spaceship's propulsion system.
A Frenchman from Earth, a kumquat from Alpharalpha B, a saurian humanoid from Gould IV, and an ammonia/ice blob from Amana XI invented the drive. They stole a throne room and antechamber from each of their respective planets, then attempted to steal the throneroom and antechamber from Galactic Central. This would allow their ship to be propelled across the Galaxy in pursuance of their nefarious ends. At Galactic Central, due to the deductions of Rufus Q Shupilluliumash, they were foiled by Space Patrol and arrested for operation of an unauthorized space drive within city limits.