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Warships

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"The Azipod concept is not practical for use on warships because it is too easily damaged"

Mistral class amphibs use azimuth thrusters. —Preceding unsigned comment added by 99.241.194.180 (talk) 05:00, 6 December 2009 (UTC)[reply]

Unclear statement

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"The new CRP (Contra Rotating Propellers) Azipod places a counter rotating azipod propeller behind a fixed propeller achieving improved fuel efficiency[1]."

what is a fixed propeller? This is quite unclear. Kitplane01 (talk) 07:13, 17 July 2009 (UTC)[reply]

Source for cruise ship list

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The source for the cruise ship list is cruise-chat (dot) com. Wikipedias spam filter blocks me from including the link, but here it is in a slightly modified form:

A better reference is at the ABB site. [1] I have not checked if the two lists match. Petri Krohn 10:57, 3 April 2006 (UTC)[reply]

ABB-ShinNihonkai-Azipod-CRP.jpg

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Is image ABB-ShinNihonkai-Azipod-CRP.jpg available? Seems to be missing from here. Only references on Google images were this page and copies of this page. EricTheRed 18:53, 24 June 2007 (UTC)[reply]

QM2?

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The list of ships with azipods includes RMS Queen Mary 2, but the 'See also' section says "A similar but competing product is the Rolls-Royce Mermaid azimuth thruster.[2][3] This is the thruster on the Queen Mary 2." —WWoods (talk) 16:22, 15 April 2008 (UTC)[reply]

Is the Queen Mary 2 diesel-electric? Or are its azipods diesel-driven via gears? How much is 'azipod' tending to become a genericized tradename? Anthony Appleyard (talk) 11:15, 29 January 2010 (UTC)[reply]

Rolls-Royce Mermaid propulsion units are diesel-electric as described on their website: "Conventional shafting, propeller and rudder systems are replaced by a single azimuthing unit, which has an integrated synchronous and brushless electric motor directly driving the propeller shaft." I think that pretty much defines what it's about. I don't know about "azipod" becoming a genericized tradename (I hope not!), but for now the article is about "the registered brand name of the ABB Group for their azimuth thruster", so I think the list should therefore include only ships that have "genuine" Azipods, not just any electric azimuth thrusters that someone somewhere might refer as "azipods". Tupsumato (talk) 23:20, 3 February 2010 (UTC)[reply]
I finally decided to remove Queen Mary 2 from the list of ships with Azipod propulsion. Tupsumato (talk) 18:37, 11 April 2010 (UTC)[reply]

If someone could find an up-to-date list of ships with Azipod propulsion units, he or she could update the list and purge ships propelled by competing products. Perhaps we could also add some additional information, like the number and type of pods, power and if there's something special about the ship (Seili was the first ship to be equipped with an Azipod unit, Varzuga was the first merchant ship etc.). Tupsumato (talk) 23:20, 3 February 2010 (UTC)[reply]

Disadvantages

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None have been mentioned. One is that for maximum efficiency the pod has to be set under and proud of the hull. This creates a great draught, precluding many vessels from many ports. The efficiency is reduced by having the hull slopped to the stern fixing the pod no deeper than the hull. Also the swivel mechanism attaching the pod to the hull is a weak link taking a lot of stress at this point. Some cruise ships use conventional fixed shaft propellers 94.192.60.163 (talk) 10:26, 28 April 2015 (UTC)[reply]

While this may hold true for drillships with retractable L- or Z-drive thrusters that are used for stationkeeping (dynamic positioning), Azipod units are not installed in such fashion. The propulsion unit does not protrude below the keel of the vessel and typically even the tip of the propeller remains above baseline. It is true that the bearing is weaker than a rigid welded construction, with proper dimensioning the loads on the steel structures are not a problem. That's why Azipod units are used in e.g. icebreakers. Tupsumato (talk) 13:01, 28 April 2015 (UTC)[reply]

Efficiency

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The article does not mention what efficiency gains are in percentage terms. 94.192.60.163 (talk) 10:26, 28 April 2015 (UTC)[reply]

I agree. However, the information is relatively hard to find and there are not that many ships from which there exist both conventional and Azipod versions. The cruise ships built in Helsinki in 1990s and 2000s are probably the only good example. Tupsumato (talk) 13:05, 28 April 2015 (UTC)[reply]
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Becoming generic

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More evidence in published sources that "azipod" is becoming generic. The article should mention this in the lede, rather than buried in the article later on.

  • 2005: "Is podded propulsor pioneer ABB annoyed to see its azipod becoming a generic term?"[1]
  • 2001: "There appears to be a rsik that the word "azipod" wil be treated as a generic term..."[2]
  • 2004: "This is primarily a text on handling oceangoing ships so this discussion of omnidirectional propulsion will focus on the uses of a generic Azipod system..."[3]
  • 1998: "The Warship is designed to use podded electric drive units (so-called 'azipods')..."[4]

96.127.247.138 (talk) 08:15, 20 December 2016 (UTC)[reply]

I moved the text about generic trademark to the lead and used the first two references. As for other issues in the article, I'll try to address them later. Help is welcome. Tupsumato (talk) 12:15, 20 December 2016 (UTC)[reply]
excellent, thanks.96.127.247.138 (talk) 18:20, 20 December 2016 (UTC)[reply]

Refs cited

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  1. ^ Marine Propulsion & Auxiliary Machinery: The Journal of Ships' Engineering Systems. Riviera Maritime Media. 2005.
  2. ^ Brian J. Cudahy (2001). The Cruise Ship Phenomenon in North America. Cornell Maritime Press. pp. 53–. ISBN 978-0-87033-529-7.
  3. ^ Daniel H. MacElrevey; Daniel E. MacElrevey (30 October 2004). Shiphandling for the mariner. Cornell Maritime Press. ISBN 978-0-87033-558-7.
  4. ^ Jane's International Defense Review: IDR. Jane's Information Group. 1998.
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