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Daddyfto

Tug assisting Victory this morning?

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Wonder why a tug is attached to Victory's stern in Miami this morning?

Does anybody know?

Cheers

D

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in some ports they are required to be used to assist with docking.

 

Here in NYC, it is pretty common to see them helping ships dock. This was taken on my sunrise cruise last week

DSC00788.JPG

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Ships that are shaft propelled (aka most Carnival ships) use stern thrusters. Stern thrusters themselves do not generate enough power to maneuver the ship 90 degrees in that short of a space (referencing @shof515's image). Carnival Victory is a shaft propelled ship, hence the tug. Ships like the Carnival Vista, however, do not need tugs since they have azipods which generate more power and have a smaller turning radius. 

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Actually this is not normal for Carnival Victory at POM.  I've seen it leave many times

and have left POM on board Victory and she's never needed tugs.  I'm wondering if there is a thruster problem.  Also I've seen tugs pull and nudge ships before but follow with the ships stern line attached that was different?  I'll watch at 4 and see if she requires assistance leaving port.

Cheers

D

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11 hours ago, jbethel11 said:

Ships that are shaft propelled (aka most Carnival ships) use stern thrusters. Stern thrusters themselves do not generate enough power to maneuver the ship 90 degrees in that short of a space (referencing @shof515's image). Carnival Victory is a shaft propelled ship, hence the tug. Ships like the Carnival Vista, however, do not need tugs since they have azipods which generate more power and have a smaller turning radius. 

Not quite correct.  The Norwegian Sky is a shafted propeller ship, with bow and stern thrusters, and can turn 360* in her own length.  And a fun fact is that while a ship is moving forward, the stern thrusters have more effect on turning the ship than the bow thrusters.  The reason tugs are used in NYC is that you have a very strong river current, and a similarly strong tidal current that is perpendicular to the "slip"or "berth", and in these situations the stern thrusters may not be able to counteract the current.  Also, most cruise ships with shafted propellers will have "high lift" or "Becker" rudders that not only direct water flow like a conventional rudder, but creates an "airfoil" much like an airplane wing, that creates "lift" to move the stern in the direction desired.  Any ship with bow and stern thrusters, or azipods and bow thrusters, can turn a full circle in its own length, if it is stopped.

 

This use of a tug (can anyone say whether the tug escorted the ship all the way from the sea buoy?), is indicative of a failure of one or more of the redundant steering systems, and is required by USCG.  It can also be if the wind is high, or if the Gulf Stream is running hard outside the port, they may need a tug at the entrance, due to the Stream being perpendicular to the entrance.

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2 minutes ago, chengkp75 said:

Not quite correct.  The Norwegian Sky is a shafted propeller ship, with bow and stern thrusters, and can turn 360* in her own length.  And a fun fact is that while a ship is moving forward, the stern thrusters have more effect on turning the ship than the bow thrusters.  The reason tugs are used in NYC is that you have a very strong river current, and a similarly strong tidal current that is perpendicular to the "slip"or "berth", and in these situations the stern thrusters may not be able to counteract the current.  Also, most cruise ships with shafted propellers will have "high lift" or "Becker" rudders that not only direct water flow like a conventional rudder, but creates an "airfoil" much like an airplane wing, that creates "lift" to move the stern in the direction desired.  Any ship with bow and stern thrusters, or azipods and bow thrusters, can turn a full circle in its own length, if it is stopped.

 

This use of a tug (can anyone say whether the tug escorted the ship all the way from the sea buoy?), is indicative of a failure of one or more of the redundant steering systems, and is required by USCG.  It can also be if the wind is high, or if the Gulf Stream is running hard outside the port, they may need a tug at the entrance, due to the Stream being perpendicular to the entrance.

Thanks for correcting me! I love learning more about propulsion! 😊

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Yes  was just going to question if its one of those Artist cruises that require extra load in time ....but after seeing that tug this morning with still not sure ...hope all is well

 

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Keep in mind departure times are controlled by the port. Any number of things could have delayed departure.

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On 6/28/2019 at 6:58 PM, Daddyfto said:

OK  on its way no tugs ...Cardi B concert cruise

 

They had to load up all those extra rolling "r"s.

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1 minute ago, ProgRockCruiser said:

 

They had to load up all those extra rolling "r"s.

Okaaaaaay

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42 minutes ago, amyotravel said:

Okaaaaaay

I think you mean:

giphy.gif

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