Yes, the available of reduction gears was a problem during WWI.
Another reason ships converted to electric drives was the ability to use power more effectively. During the night, a cruise ship will go from port to port requiring a high propulsion load. Since people are asleep, the hotel load and accessory loads are lower. Same applies to a battle ship. If a ship is in waters where they do not need submarine warfare loads, they can load shed these loads and shift more power to other loads. If a ship has laser weapons, it can shift large amounts of power to these weapons for surface warfare. By being able to shift loads more effectively, all electric ships make better use of the available power. The use of inverters, solid state breakers and transfer switches, computer controlled distribution systems, and islands of power are a big plus during damage control operations. This is also plus for all electric ships. ________________________________ From: EV <ev-boun...@lists.evdl.org> on behalf of Cor van de Water via EV <ev@lists.evdl.org> Sent: Wednesday, October 4, 2017 3:56 PM To: Electric Vehicle Discussion List Cc: Cor van de Water Subject: Re: [EVDL] EVLN: YARA Birkeland zero emission autonomous cargo e-ship (v) All the documents I can find on electric ship propulsion shows that it was for efficiency reasons and flexibility, so the prime mover + generator can be placed anywhere and no long prop shaft is needed. Only the last of the 3 docs that I read (the IEEE one) has a short mention of a war-time reason to go for electric drive on page 8 about the T2 "Navy Oilers", but it is not the Diesel Engine, instead it mentions the reduction gearing needed for the diesel engine as the limiting production level, so switching to electric drive removed the reduction gear requirement and thus more ships could be built. Another (more recent) argument is the full coversion of the ships to electric, not just its propulsion. Even the aircraft catapult is converted to electric, so the ship receives a jolt of power when a plane lands, comparable to regen braking. It also avoids the piping needed for the traditionally steam-powered catapult. Then the use of rail guns make a powerful electric generator required. This is easy if you already have a powerful electric propulsion. Another argument is surviveability. It is simple to split a primary mover engine in two and place them in different parts of the ship or align them differently than traditional. This is not new. Even steam turbines were repositioned when they were installed as generators connected to electric drive motors. http://futureforce.navylive.dodlive.mil/2015/08/electric-ship-propulsion/ The Curious History of Electric Ship Propulsion<http://futureforce.navylive.dodlive.mil/2015/08/electric-ship-propulsion/> futureforce.navylive.dodlive.mil In 1929, USS Lexington (CV 2) used its electric propulsion system to power the city of Tacoma, Washington, during a local energy crisis. Photo courtesy of Tacoma ... https://www.defensemedianetwork.com/stories/going-electric/ [https://www.defensemedianetwork.com/wp-content/uploads/2010/06/makin-island-web-lr.jpg]<https://www.defensemedianetwork.com/stories/going-electric/> Going Electric: The History and Future of Naval Electric ...<https://www.defensemedianetwork.com/stories/going-electric/> www.defensemedianetwork.com The advantages and disadvantages of electric drive in ships. http://folk.ntnu.no/torarnj/IEEE_Proceedings_Skjong_2015.pdf IEEE PROCEEDINGS 2015 1 The Marine Vessel’s Electrical ...<http://folk.ntnu.no/torarnj/IEEE_Proceedings_Skjong_2015.pdf> folk.ntnu.no IEEE PROCEEDINGS 2015 1 The Marine Vessel’s Electrical Power System: From its Birth to Present Day Espen Skjong1 ;2 3, Egil Rødskar , Marta Molinas 1, Tor Arne ... Quote from page 8: "At this time the turbo-electric propulsion system was not a new invention, as all the capacity to manufacture reduction gears was committed to supplying the naval fleet, the use of turbo-electric propulsion was a natural choice resulting in an average production time from laying the keel to sea trials to about 70 days" -----Original Message----- From: EV [mailto:ev-boun...@lists.evdl.org] On Behalf Of Alan Arrison via EV Sent: Wednesday, October 04, 2017 2:42 PM To: ev@lists.evdl.org Cc: Alan Arrison Subject: Re: [EVDL] EVLN: YARA Birkeland zero emission autonomous cargo e-ship (v) Where did the electricity come from for the electric drive motors? It had to be some kind of fossil fuel engine running a generator. Al On 10/4/2017 11:20 AM, ROBERT via EV wrote: > The electrification of ships has a long history. During WWII, diesel engines > were in short supply. The US needed tanker ships because a large number were > sunk by the German U2 boats. The T2 class tanker was the primary tanker. > Since diesel engines were in short supply, the US started installing large > electric propulsion motors. Even today some of these T2 tankers are still in > service with the original electric motors. In the 1980's, I did some design > work on the electrical control system on the USNS Redstone. The Redstone was > a T2 tanker with the original electric motors and drive cubicle. The ship > had been extended by 72ft by adding a section in the center. The Redstone > was station in FL and monitored launches from Cape Canaveral/Kennedy. The > ship was finally decommissioned in the 2000s and cut up for scrap. The > electric motors and drive controls were built by GE and as far as I know they > operated trouble free. I reviewed the controls for possible replacement; > however, due to cost it was not done. In addition, they still worked OK. > The controls were manually operated and the contractors made a huge noise > when operating. To say the least, the electric propulsion system and drive > was amazing. Great job for me. > > > Most if not all ocean going cruise ships have AC/AC drives. The QE2 was > converted in the 1980 to AC/AC drives. > > > > > ________________________________ > From: EV <ev-boun...@lists.evdl.org> on behalf of brucedp5 via EV > <ev@lists.evdl.org> > Sent: Wednesday, October 4, 2017 4:08 AM > To: ev@lists.evdl.org > Cc: brucedp5 > Subject: [EVDL] EVLN: YARA Birkeland zero emission autonomous cargo > e-ship (v) > > > > https://cleantechnica.com/2017/09/30/final-design-autonomous-electric- > container-vessel-known-yara-birkeland-revealed/ > [https://cleantechnica.com/files/2017/09/final-design-of-autonomous-al > l-e-150x150.jpg]<https://cleantechnica.com/2017/09/30/final-design-aut > onomous-electric-container-vessel-known-yara-birkeland-revealed/> > > Final Design Of Autonomous, All-Electric Container Vessel - Yara > Birkeland - > Revealed<https://cleantechnica.com/2017/09/30/final-design-autonomous- > electric-container-vessel-known-yara-birkeland-revealed/> > cleantechnica.com > The final design of the all-electric, autonomous container ship known > as the Yara Birkeland has now been completed, and testing has > commenced at SINTEF Ocean's 80 metre test tank facility in Trondheim, > Norway. Accompanying this announcement, the Norwegian government > enterprise known as ENOVA revealed that it will be providing support > to the project in the form > > > Final Design Of Autonomous, All-Electric Container Vessel - Yara > Birkeland - Revealed September 30th, 2017 James Ayre > > [videos > https://youtu.be/CK600K1tYUQ > [https://i.ytimg.com/vi/CK600K1tYUQ/maxresdefault.jpg]<https://youtu.b > e/CK600K1tYUQ> > > Testing the YARA Birkeland<https://youtu.be/CK600K1tYUQ> > youtu.be > Model tank testing of the worlds first autonomous zero emission container > feeder. > > > Testing the YARA Birkeland > > https://youtu.be/OdWOAgc79aM > [https://i.ytimg.com/vi/OdWOAgc79aM/maxresdefault.jpg]<https://youtu.b > e/OdWOAgc79aM> > > Autonomous ship model tank testing<https://youtu.be/OdWOAgc79aM> > youtu.be > Model tank testing of the worlds first autonomous zero emission container > feeder, the YARA Birkeland. > > > Autonomous ship model tank testing > > https://youtu.be/4Ogg4_ge0f8 > [https://i.ytimg.com/vi/4Ogg4_ge0f8/hqdefault.jpg]<https://youtu.be/4O > gg4_ge0f8> > > YARA Birkeland zero emission autonomous container > feeder<https://youtu.be/4Ogg4_ge0f8> > youtu.be > The first commercial autonomous vessel in the world, and also the first > commercial zero ballast vessel. A game changer for the environment and for > the shippi... > > > YARA Birkeland zero emission autonomous cargo e-ship ] > > The final design of the all-electric, autonomous container ship known > as the Yara Birkeland has now been completed, and testing has > commenced at SINTEF Ocean's 80 metre test tank facility in Trondheim, Norway. > > Accompanying this announcement, the Norwegian government enterprise > known as ENOVA revealed that it will be providing support to the > project in the form of a NOK 133 million ($16.7 million) financial > contribution. > > While a full-scale version of the new design has yet to be revealed > (obviously), the recent announcement was accompanied by the reveal of > a 6-meter long, 2.4-ton model. The ship itself is expected to be > delivered and to begin testing and operations in early 2019, with > fully autonomous functioning expected to begin in 2020. > > Once in operation, the Yara Birkeland will displace the equivalent of > 40,000 semi truck trips from Yara's Porsgrunn fertiliser plant in > southern Norway to the ports of Brevik and Larvik - and will thus > curtail substantial greenhouse gas emissions. > > The press release provides more: "Following the announcement in May, > the vessel has been designed at Norwegian design and engineering > company Marin Teknikk. A cutting edge six meter long and 2.4 tons > model of the final design using technology destined for the real ship, > including a fully working thruster system from KONGSBERG, will now > undergo comprehensive testing at SINTEF Ocean before construction of the > full-scale vessel starts. > The decision of where the vessel is to be built will be decided and > disclosed by the end of 2017." > > The President and CEO of KONGSBERG, Geir Håøy, commented on the news: > "Initial tests of the model were successful, proving both concept and > the technology. The testing at SINTEF Ocean marks an important > milestone in the development. This vessel is important for the entire > maritime industry, and Yara deserves praise for their initiative and > commitment. Yara Birkeland is the start of a major contribution to > fulfilling national and international environmental impact goals, and > will be a global milestone for seaborne transportation." > > KONGSBERG itself will be providing the Yara Birkeland's electric > drive, battery systems, propulsion control systems, and autonomous system > sensors. > [© Sustainable Enterprises Media] > > > > > For EVLN EV-newswire posts use: > http://evdl.org/evln/ > EVDL EV News Archive - Electric Vehicle Discussion > List<http://evdl.org/evln/> evdl.org EVLN - EV News Archive Edited by > Bruce {EVangel} Parmenter: EVLN: home | help | archive | news | > privacy policy | terms of service > > > > > {brucedp.neocities.org} > > -- > Sent from: > http://electric-vehicle-discussion-list.413529.n4.nabble.com/ > Electric Vehicle Discussion List | Mailing List > Archive<http://electric-vehicle-discussion-list.413529.n4.nabble.com/> > electric-vehicle-discussion-list.413529.n4.nabble.com > Electric Vehicle Discussion List forum and mailing list archive. Welcome to > the EVDL! This forum is a web "front end" and archive for an email > discussion list. If you post here and... > > > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > [http://www.evdl.org/images/evdl.jpg]<http://www.evdl.org/help/index.h > tml#usub> > > EVDL Subscription Information and > Help<http://www.evdl.org/help/index.html#usub> > www.evdl.org<http://www.evdl.org> > About the EVDL: The Electric Vehicle Discussion List, founded in 1991 by EV > enthusiast Clyde Visser, is an active and vital source of information and > help for people ... > > > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > EV -- Electric Vehicle Discussion List - lists.evdl.org > ...<http://lists.evdl.org/listinfo.cgi/ev-evdl.org> > lists.evdl.org > The Electric Vehicle Discussion List is a forum for discussing the current > state of the art and future direction of electric vehicles (EVs). We define > an EV as a ... > > > Please discuss EV drag racing at NEDRA > (http://groups.yahoo.com/group/NEDRA) > > -------------- next part -------------- An HTML attachment was > scrubbed... > URL: > <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20171004/10 > b5e34b/attachment.html> > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > Please discuss EV drag racing at NEDRA > (http://groups.yahoo.com/group/NEDRA) > > _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.evdl.org/private.cgi/ev-evdl.org/attachments/20171004/d7300bb6/attachment.html> _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
