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Catamarans equipped with Autoprop propellers can achieve significant fuel savings by running one engine at cruising speed while the other remains at a low idle.2:12 The Autoprop design features self-pitching blades that react to the flow of water generated by the boat's movement.1:11 When one engine drives the vessel forward, the water flow forces the blades of the second, idling propeller to automatically adjust to a pitch matching the active propeller.1:24 By engaging the second engine in forward gear at minimal revolutions, the idling propeller begins to provide thrust, effectively assisting propulsion.1:34 This configuration maintains a cruising speed only slightly lower than using both engines at full power while reducing total fuel consumption by at least 50 percent.2:12 Stefano Cova, an importer of Autoprop propellers, confirms this phenomenon occurs specifically due to the unique blade mechanics of this propeller model.0:44

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