Through their diesel propulsion, the Type 41s achieved long range through their low fuel use. The ships had a total of twelve Admiralty Standard Range Mk.1 (ASR1) diesel engines disposed four-each in three engine rooms. In the fore and aft engine rooms, two engines were connected to the drive shafts by fluid clutches and reduction gearboxes, while the other two were not connected to the shafts, but instead drove 360kW alternators to provide electrical power. In the centre engine room, all four engines were connected to the shafts. "Jaguar" was fitted with controllable-pitch propellers. Initially the diesel engines proved somewhat unreliable, but these teething troubles were gradually overcome and reliability eventually became very satisfactory.