<P> The ship's power comes from six medium speed marine diesel generating sets: three 16 - cylinder Wärtsilä 16V46D common rail engines producing 18,860 kilowatts (25,290 hp) each and three similar 12 - cylinder Wärtsilä 12V46D engines producing 13,860 kilowatts (18,590 hp) each . The fuel consumption of the main engines at full power is 1,377 US gallons (5,210 l; 1,147 imp gal) of fuel oil per engine per hour for the 16 - cylinder engines and 1,033 US gallons (3,910 l; 860 imp gal) per engine per hour for the 12 - cylinder engines . The total output of these prime movers, some 97,020 kilowatts (130,110 hp), is converted to electricity, used in hotel power for operation of the lights, elevators, electronics, galleys, water treatment plant, and all of the other systems used on the operation of the vessel, as well as propulsion . Propulsion is provided by three 20,000 - kilowatt (26,800 hp) Azipods, ABB's brand of electric azimuth thrusters . These pods, suspended under the stern, contain electric motors driving 20 - foot (6 m) propellers . Because they are rotatable, no rudders are needed to steer the ship . Docking is assisted by four 5,500 - kilowatt (7,380 hp) transverse bow thrusters . </P> <P> The ship carries 18 lifeboats that hold 370 people each, for a total of 6,660 people . Inflatable life rafts provide for additional passengers and crew . </P> <Table> <Tr> <Th> Name </Th> <Th> Status </Th> <Th> Entered service with Royal Caribbean </Th> <Th> Gross tonnage </Th> <Th> Length </Th> <Th> Home port </Th> <Th> Notes </Th> <Th> Image </Th> </Tr> <Tr> <Td> Oasis of the Seas </Td> <Td> In service </Td> <Td> 5 December 2009 </Td> <Td> 225,282 </Td> <Td> 361.8 m (1,187 ft) </Td> <Td> Port Canaveral, Florida </Td> <Td> Underwent drydock refurbishment in September 2014 . Repositioned to Port Canaveral from Port Everglades in November 2016, being replaced by sister Harmony of the Seas . </Td> <Td> </Td> </Tr> <Tr> <Td> Allure of the Seas </Td> <Td> In service </Td> <Td> 1 December 2010 </Td> <Td> 225,282 </Td> <Td> 361.8 m <P> (1,187 ft) </P> </Td> <Td> Port Everglades, Florida </Td> <Td> World's second largest cruise ship, exceeding the length of Oasis of the Seas by 50 millimetres (2 in). Will reposition to Port of Miami, Florida in November, 2018 . </Td> <Td> </Td> </Tr> <Tr> <Td> Harmony of the Seas </Td> <Td> In service </Td> <Td> 15 May 2016 </Td> <Td> 226,963 </Td> <Td> 362.1 m (1,188 ft) </Td> <Td> Port Everglades, Florida </Td> <Td> The largest cruise ship in the world, exceeding prior ships in the class by 0.3 metres (1 ft) length and 1,681 GT . </Td> <Td> </Td> </Tr> <Tr> <Td> Symphony of the Seas </Td> <Td> Floated out on June 9, 2017 </Td> <Td> 21 April 2018 </Td> <Td> 230,000 </Td> <Td> 362.1 m (1,188 ft) </Td> <Td> Port of Miami, Florida </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> TBA </Td> <Td> Ordered </Td> <Td> Spring 2021 (planned) </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> TBA </Td> <Td> Will be fifth Oasis - class cruise ship </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> Name </Th> <Th> Status </Th> <Th> Entered service with Royal Caribbean </Th> <Th> Gross tonnage </Th> <Th> Length </Th> <Th> Home port </Th> <Th> Notes </Th> <Th> Image </Th> </Tr>

Harmony of the seas vs oasis of the seas size
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