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Azipod vs. shaftline propulsion

M/S Fantasy. M/S Elation. six with diesel-electric shaft line. and last two with Azipod s. Azipod vs. shaftline propulsion. Carnival Cruise Line’s Fantasy class consists of eight sister ships. Identical hull form. Azipod vs. shaftline propulsion. Sea trial experiences of M/S Elation.

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Azipod vs. shaftline propulsion

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  1. M/S Fantasy M/S Elation six with diesel-electric shaft line and last two with Azipods Azipod vs. shaftline propulsion Carnival Cruise Line’s Fantasy class consists of eight sister ships Identical hull form

  2. 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 themean value of correspondingspeeds of the previous six Fantasy-class ship… • …corresponds areduction of circa 7,5 to 9 per cent in theneed of propulsion power to achieve original speed… • …typical cruise ship operation profilethis reduction in power means a fuel saving of circa 40 tons during one week. From: Practical Design of Ships and Mobile Units M.W. Oosterveld & S.G. Tan, editors.

  3. 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 Propulsion motor h = 0,955-0,974 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 Mechanical vs. Diesel-Electric transmission Diesel-Electric Mechanical

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

  5. 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

  6. Operational Benefits Manoeuvring • Good coursekeeping stability • Short crash stop distance • Small turning circle

  7. Azipods Stern thrusters Rudders Flap rudders Increased side thrust capacity Manoeuvring • Excellent for dp- and joystick operation • Safer and faster harbour operations • Reduced power demand for manoeuvring Total transverse thrust with 3 MW

  8. Reduced exhaust emissions Environmental Aspects • Reduced exhaust emissions • Improved safety of navigation through redundancy and excellent steerability

  9. 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

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