 Whereas "Peterel" required six stokers during the trials, "Spiteful" required only three boiler-room crew; while "Peterel"s crew had to dispose of 1.5 tons (1.52 tonnes) of ash and clinker, "Spiteful" produced no such waste.Further, while "Peterel" took 1.5 hours to prepare for steaming, "Spiteful" took 10 minutes.In June 1906 the same journal reported that "Spiteful" was being used by the Admiralty to train engine-room crews in the operation of oil-burning equipment.