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» Cruise Talk   » Technically Speaking   » Why no stern thruster?

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Author Topic: Why no stern thruster?
Rego007
First Class Passenger
Member # 4632

posted 11-17-2008 03:38 AM      Profile for Rego007     Send New Private Message      Edit/Delete Post  Reply With Quote 
I just returned from the first Monarch of the Seas cruise out of Port Canaveral. During the Captain's noon report, she mentioned that the Monarch is the only ship of the Sovereign class not equipped with a stern thruster. This seemed strange, with her being the second (middle) of the three ship series. I understand that both Sovereign and Majesty of the Seas do have stern thrusters.

I wonder if any of you might have and idea why this strange (in my opinion, anyway) decision was made when building this particular ship.

Regards,

Rego007


Posts: 106 | From: Daytona Beach, FL USA | Registered: Apr 2004  |  IP: Logged
Lubber
First Class Passenger
Member # 13710

posted 11-17-2008 09:00 AM      Profile for Lubber     Send New Private Message      Edit/Delete Post  Reply With Quote 
Stern thrusters are redundant on a ship with azipods, since the azipods themselves can provide the same kind of side thrust-- although most likely not as smoothly.
Posts: 241 | From: Land | Registered: Feb 2008  |  IP: Logged
dougnewman
First Class Passenger
Member # 11349

posted 11-17-2008 09:14 AM      Profile for dougnewman   Author's Homepage     Send New Private Message      Edit/Delete Post  Reply With Quote 
That's true, but MONARCH OF THE SEAS doesn't have pods.

I have no idea why she doesn't have a stern thruster.


Posts: 2072 | From: Long Island, NY, USA | Registered: Sep 2007  |  IP: Logged
Ernst
First Class Passenger
Member # 5369

posted 11-17-2008 10:00 AM      Profile for Ernst   Author's Homepage   Email Ernst   Send New Private Message      Edit/Delete Post  Reply With Quote 
As far as one can tell from list on the Det Norske Veritas webpage the thruster arrangement of Majesty of the Seas and Monarch of the Seas seems to be equivalent whereas the one of Sovereign is different.

Monarch of the Seas

Majesty of the Seas

Sovereign


Posts: 9746 | From: Eindhoven | Registered: Jan 2005  |  IP: Logged
lasuvidaboy
First Class Passenger
Member # 4527

posted 11-17-2008 12:15 PM      Profile for lasuvidaboy     Send New Private Message      Edit/Delete Post  Reply With Quote 
I recall Norway having a stern thruster while QE2 does'nt. QM2 of course has PODS.
Posts: 7654 | From: Hollywood Hills/L.A. | Registered: Mar 2004  |  IP: Logged
dougnewman
First Class Passenger
Member # 11349

posted 11-17-2008 07:25 PM      Profile for dougnewman   Author's Homepage     Send New Private Message      Edit/Delete Post  Reply With Quote 
Ernst I'm sure the captain was right about her own ship not having one but perhaps she misspoke or was mistaken about MAJESTY.

In that case the question would be why SOVEREIGN appears to have a stern thruster the two newer ships don't. Perhaps it was added?

I have seen all these ships enough times I should be able to recall whether any of them have stern thrusters but I'm drawing a blank. (Of course you can visually tell whether any ship has a stern thruster by the markings on the hull.)

Bruce - Yes, NORWAY had stern thrusters, in fact three of them, and three bow thrusters. These were added by NCL. QE2 still has her original two bow thrusters, now reportedly operating at about half their original power after 39 years of use.


Posts: 2072 | From: Long Island, NY, USA | Registered: Sep 2007  |  IP: Logged
lasuvidaboy
First Class Passenger
Member # 4527

posted 11-17-2008 07:38 PM      Profile for lasuvidaboy     Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by dougnewman:

Bruce - Yes, NORWAY had stern thrusters, in fact three of them, and three bow thrusters. These were added by NCL. QE2 still has her original two bow thrusters, now reportedly operating at about half their original power after 39 years of use.[/QB]


The latest images of ss Norway on the Midship Century site show the aft three thrusters. As for QE2, I wonder w/the tens of millions spent on her over the years why her original thrusters were'nt rebuilt years ago.


Posts: 7654 | From: Hollywood Hills/L.A. | Registered: Mar 2004  |  IP: Logged
Magic Pipe
First Class Passenger
Member # 6994

posted 11-17-2008 08:01 PM      Profile for Magic Pipe     Send New Private Message      Edit/Delete Post  Reply With Quote 
The Monarch is equipped with flap rudders, which improve slow speed maneauverability. I don't know if Sovereign also has flap rudders. If Sovereign has stern thrusters but no flap rudders, maybe Royal Caribbean decided to substitute flap rudders for stern thrusters on the Monarch.
Posts: 213 | From: NYC | Registered: Jul 2006  |  IP: Logged
Rego007
First Class Passenger
Member # 4632

posted 11-18-2008 04:13 AM      Profile for Rego007     Send New Private Message      Edit/Delete Post  Reply With Quote 
I've done some looking through my photos of the three Sovereign class ships. Sure enough, Sovereign and Majesty have the hull markings for the stern thruster, but Monarch does not. All three have the twin Becker (flap) rudders.

When on board, she seemed to maneuver well enough, albeit with a little more vibration when the rudders were at great angles.

My initial point in this matter was that I found it strange that the "middle" ship of this trio would be the one without the thruster. Sovereign was the prototype of the group. I could see if she didn't have one and the others were designed with one. Or, conversely, if it was determined to not be needed and the latter two were designed without the thruster. It just struck me as rather strange, but I guess we may never know why.

Thanks again,
Rego007


Posts: 106 | From: Daytona Beach, FL USA | Registered: Apr 2004  |  IP: Logged
dougnewman
First Class Passenger
Member # 11349

posted 11-18-2008 12:40 PM      Profile for dougnewman   Author's Homepage     Send New Private Message      Edit/Delete Post  Reply With Quote 
It's definitely an interesting question.

I'm sure someone knows why, but the odds of finding that person are pretty slim...however, you never know, miracles sometimes happen on the Internet.


Posts: 2072 | From: Long Island, NY, USA | Registered: Sep 2007  |  IP: Logged
Guest
First Class Passenger
Member # 1157

posted 11-24-2008 11:56 PM      Profile for Guest        Edit/Delete Post  Reply With Quote 
quote:
Originally posted by dougnewman:
QE2 still has her original two bow thrusters, now reportedly operating at about half their original power after 39 years of use.

Hey Doug,

I was informed when aboard QE2 in March 08 that one of her two thrusters was unable to be used due to technical problems. QE2 required up to 4 tugs to get out of berths that had previously been done with 2 during this voyage. When asked, they said it's unlikely that this thrusters would be fixed before her retirement, and considering she never made it back to Dry Dock, I'd say it's going broken to Dubai.

Chris.


Posts: 1888 | From: Earth | Registered: Mar 2000  |  IP: Logged
dougnewman
First Class Passenger
Member # 11349

posted 11-25-2008 12:08 AM      Profile for dougnewman   Author's Homepage     Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by Chris:
I was informed when aboard QE2 in March 08 that one of her two thrusters was unable to be used due to technical problems.
Interesting...so she has about 1/4 of the total original power then!

Posts: 2072 | From: Long Island, NY, USA | Registered: Sep 2007  |  IP: Logged
Indarra
First Class Passenger
Member # 6005

posted 11-25-2008 02:11 AM      Profile for Indarra     Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by Rego007:
My initial point in this matter was that I found it strange that the "middle" ship of this trio would be the one without the thruster. Sovereign was the prototype of the group. I could see if she didn't have one and the others were designed with one. Or, conversely, if it was determined to not be needed and the latter two were designed without the thruster. It just struck me as rather strange, but I guess we may never know why.

I'm guessing, but one explanation might be that after in-service experience with the first ship, someone suggested they could try to get away without the thruster. Howeber, experience with the second ship showed that, on balance, the thruster was desirable to have.


Posts: 274 | From: Tokyo | Registered: Oct 2005  |  IP: Logged
TampaMike
First Class Passenger
Member # 4445

posted 12-11-2008 12:14 AM      Profile for TampaMike   Email TampaMike   Send New Private Message      Edit/Delete Post  Reply With Quote 
The Sovereign has 2 forward, one aft.

Monarch and Majesty have 2 forward, none aft.

All three have same variable pitch propellors, steering gear, wartsila diesels, same reduction gears and rudder assemblies.

Sovereign was 'over engineered' as she was a departure in new ship contruction, and maneuverability was a concern for a vessel of this mass with shallow draft and wind impact.

Alsthom (Chantiers) shipbuilders were able to prove Sovereign's performance in sea trials that she could indeed manage Miami's turning basin without reliance on a stern thruster.

Subsequently, the stern thruster was financially redundant to the construction of Majesty and Monarch.

https://exchange.dnv.com/exchange/main.aspx?extool=vessel&subview=machinerysummary&vesselid=14915

https://exchange.dnv.com/exchange/main.aspx?extool=vessel&subview=machinerysummary&vesselid=16251

https://exchange.dnv.com/exchange/main.aspx?extool=vessel&subview=machinerysummary&vesselid=16765


Posts: 246 | From: Tampa | Registered: Feb 2004  |  IP: Logged
Colin
First Class Passenger
Member # 1676

posted 12-19-2008 06:49 PM      Profile for Colin   Email Colin   Send New Private Message      Edit/Delete Post  Reply With Quote 
quote:
Originally posted by Chris:

Hey Doug,

I was informed when aboard QE2 in March 08 that one of her two thrusters was unable to be used due to technical problems. QE2 required up to 4 tugs to get out of berths that had previously been done with 2 during this voyage. ... Chris.


We had a similar situation once - Can't remember exactly when. The Chief Engineer got a wet suit on and went down to have a look. He eventually reappeared with the remains of a lobster-pot.

He later told us he only did it himself because it was warm water, if it had been cold he would have sent someone else. Ah, the privilege of rank

Regards, Colin.


Posts: 283 | From: Inverness, Scotland | Registered: Nov 2000  |  IP: Logged

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