Azipod vs. shaftline propulsion Carnival Cruise Line’s Fantasy class consists of eight sister ships six with diesel-electric shaft line M/S Fantasy Identical hull form and last two with Azipods M/S Elation Brief introduction of two identical sister vessels. Note hull form was not modified to suit Azipod 21-July-2000 / Matti Nuuttila

Azipod vs. shaftline propulsion Sea trial experiences of M/S Elation …the final speed of the Elation at full power of 2×14 MW was circa 0,55 knots higher than the mean value of corresponding speeds of the previous six Fantasy-class ship… …corresponds a reduction of circa 7,5 to 9 per cent in the need of propulsion power to achieve original speed… …typical cruise ship operation profile this reduction in power means a fuel saving of circa 40 tons during one week. Comparison between Azipod and diesel electric shaft propulsion reveals the hydodynamic benefits of pulling Azipod concept From: Practical Design of Ships and Mobile Units M.W. Oosterveld & S.G. Tan, editors. 21-July-2000 / Matti Nuuttila

Mechanical vs. Diesel-Electric transmission Prime mover h = 0,36-0,43 h = 0,05-0,43 Prime mover Generator h = 0,95-0,97 h = 0,96-0,98 Reduction gear Switch board h = 0,995 h = 0,995 Shaft line bearings Fq converter h = 0,97-0,985 h = 0,995 Stern tube bearing h = 0,955-0,974 Propulsion motor h = 0,945-0,975 CP propeller /FP propeller Total propulsion train Ph = 0,264-0,397 Ph = 0,045-0,407 Total propulsion train 21-July-2000 / Matti Nuuttila

Azipod vs. other propulsion methods 50 100 [MCR] Optimal operation area Azipods 40 25 45 50 60 10 Optimal operation area mechanical drive Azipod propulsion four prime movers optimized hull form Azipod propulsion four prime movers nonoptimized hull form Diesel-electric propulsion four prime movers Efficiency from diesel to propeller Mechanical propulsion one prime mover 21-July-2000 / Matti Nuuttila

Constructional Benefits Simplified steel structure No aligning of shafts and bearings One-lift installation of the Azipod unit Building time in dry- dock is reduced 21-July-2000 / Matti Nuuttila

Operational Benefits Manoeuvring Good coursekeeping stability Short crash stop distance Small turning circle 21-July-2000 / Matti Nuuttila

Increased side thrust capacity Manoeuvring Excellent for dp- and joystick operation Safer and faster harbour operations Reduced power demand for manoeuvring Stern thrusters Azipods Flap rudders Rudders Total transverse thrust with 3 MW 21-July-2000 / Matti Nuuttila

Reduced exhaust emissions Environmental Aspects Reduced exhaust emissions Improved safety of navigation through redundancy and excellent steerability 21-July-2000 / Matti Nuuttila

Main Component lifetime Propulsion Motor > 30 years Thrust bearing > 100 000 hours Simple construction gives better reliability Propeller bearing > 100 000 hours Shaft sealing system > 5 years Main gear wheel > 30 years 21-July-2000 / Matti Nuuttila