The submarines are powered by a one shaft diesel-electric system. They are equipped with two Paxman Valenta 1600 RPS SZ diesel engines each driving a GEC electric alternator with two 120-cell chloride batteries. The batteries have a 90-hour endurance at . The ship is propelled by a GEC dual armature electric motor turning a seven-blade fixed pitch propeller. They have a diesel capacity. This gives the subs a maximum speed of on the surface and submerged. They have a range of at and at snorting depth. They have a range of at . The class has a reported dive depth of over .