Testimonials – Seatorque Marine Propulsion With the propellers designed by Newcastle University and H4 Marine supplied Seatorque’s oil-lubricated stern shafts, we are achieving the 2,600 rpm maximum revolutions of the engines …..The Twin-Disc With the propellers designed by Newcastle University and H4 Marine supplied Seatorque’s oil-lubricated stern shafts, we are achieving the 2,600 rpm maximum revolutions of the engines …..The Twin-Disc electronic engine/gearbox controls make the vessel very manoeuvrable with safety, in confined waterways, and the Seatorque stern-gear is a ...