Author Topic: Britannia Technical Paper  (Read 5479 times)

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Offline Clydebuilt1971

Britannia Technical Paper
« on: Sep 24, 2014, 11:41 AM »
For those who like the techy stuff have a look at the technical paper attached - it is available on her website and was reproduced with the permission of the Royal Institute of Naval Architects.

This paper was written by Sir Victor Shepheard, Director of Naval Construction and presented to the Institution of Naval Architects in London on April 7, 1954.

www.royalyachtbritannia.co.uk/about-the-royal-yacht/royal-yacht-facts/technical-paper/

Personally I found it very interesting.
The fact she is of rivetted construction but has a smooth hull finish (above the waterline at least) is a testament to the skill of her creators.

 8)

Gav
« Last Edit: Sep 24, 2014, 10:11 PM by Isabelle Prondzynski »

Offline June Ingram

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Re: Britannia Techincal Paper
« Reply #1 on: Sep 24, 2014, 07:06 PM »
Hi Gav -

Thank you so much for posting the Britannia Technical Paper.  It is absolutely fascinating !

June   :)
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Offline pete cain

Re: Britannia Techincal Paper
« Reply #2 on: Sep 24, 2014, 08:50 PM »
I thought she was just a Leander class converted for 'Royal duties', shows what do I know

Offline Adam Hodson

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Re: Britannia Techincal Paper
« Reply #3 on: Sep 24, 2014, 09:37 PM »
Thanks for posting Gavin! Had a quick scan through and it looks like it'll be interesting reading. I'll look forward to having a read through when I have some time. :)
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Re: Britannia Technical Paper
« Reply #4 on: Sep 25, 2014, 07:26 PM »
Absolutely fascinating!

A cinema capable of showing 3D movies!

The royal family had their own separate sewage system!

I am and was so very sad that this ship didn't get a refit to allow her to continue to operate, perhaps a diesel-electric conversion like a small version of QE2's.  It was done to make it look like QEII was economising at a time when pressure was on her to pay her way.  However I believe that the Britannia more than paid her way in promoting British interests around the world and, to be honest, making us look like we're not broke!!

Passionate about QE2's service life for 40 years and creator of this website.  I have worked in IT for 28 years and created my personal QE2 website in 1994.

Offline June Ingram

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Re: Britannia Technical Paper
« Reply #5 on: Sep 25, 2014, 07:54 PM »
Hi Rob -

Very well said, and I am in total agreement ! 

June 
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Offline Rod

Re: Britannia Technical Paper
« Reply #6 on: Sep 25, 2014, 11:28 PM »
Interesting that diesel-electric was thought of, also interesting that she was dc generators.
But as a lot have said...fascinating.

Offline June Ingram

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Re: Britannia Technical Paper
« Reply #7 on: Sep 26, 2014, 04:47 PM »
Hi Rod -

Please tell us your thoughts about the dc generators in regard to Britannia.

Thanks !

June   :)
QE2 - the ship for all of time, a ship of timeless beauty !

Offline Clydebuilt1971

Re: Britannia Technical Paper
« Reply #8 on: Sep 29, 2014, 09:53 AM »
Hi Rod -

Please tell us your thoughts about the dc generators in regard to Britannia.

Thanks !

June   :)

Would be interested to hear also Rod!! I only go with what I have seen and read etc - I'm a land lubbing Elec Engineer - you have the hands on!

DC generation on older boats is not that unusual and Britannia was a child of the 50s when DC (Direct Current) was still more prevalent in ship design.

Waverley had DC  when she was built in '47 - generated via a steam driven dynamo. I think it was either 50 or 100VDC but not sure - a Lloyds Register between 1947 and 1974 would detail this I would think.

Through time as AC equipment on board became more widespread she had an 400VAC (Alternating Current) generator added. This meant that there was a mix of voltages on board so I would imagine you'd need to be very careful when working on any of the circuits.
Post rebuild she now has 2 x diesel driven generators which operate on a Duty / Standby basis and 1 x Emergency Generator (located port side aft on the Promenade Deck. All of these generators run at 400VAC, 50Hz, 3phase. The only DC on board is 12VDC on the bridge but I cant remember what thats for!! Nevertheless theres a 230VAC - 12VDC Power Supply up there anyway!

The vast majority of vessels built up to the 50s had DC electrical power (usually 220VDC I think) - the Titanic for instance had DC power supplied by 4 x 440kW steam driven dynamos which would give a total output of approx 17600A at 100VDC! These dynamos had their own steam engines and boilers to supply the steam to drive them.

I think as time wore on 220VDC was the common voltage used as DC systems suffered from excessive "volt drops" over long cable runs - this is where the resistive properties over the length of the cable cause a drop in voltage between the source to the destination which can lead to higher current in the circuit or overcurrent situations which can result in failure of the cable etc. This is reduced by using higher voltages and also in some instances smaller sized cables can be used as the current is lower on higher voltage systems.

This is less of a problem with AC systems as the voltage can be higher in general (eg 6600VAC) and transformers used to reduce this voltage where required - for example lighting circuits at 220VAC etc. I think most AC marine systems run at 60Hz. (Domestic power in the UK is 50Hz).
In the 60s when more and more modern electrical equipment was installed on board (radar etc) the DC systems were phased out.

I read somewhere that QM and QE were DC also but cant be sure of that!

On the safety side the effects of both on the human body are quite well explained here:

http://www.brighthubengineering.com/power-plants/89792-ac-and-dc-shock-comparison/

Hopefully the above makes sense but I think Rod may be better able to explain!

Gav

« Last Edit: Sep 30, 2014, 01:42 PM by Clydebuilt1971 »

Offline Bruce Nicholls

Re: Britannia Technical Paper
« Reply #9 on: Sep 29, 2014, 06:27 PM »
Absolutely fascinating!


I am and was so very sad that this ship didn't get a refit to allow her to continue to operate, perhaps a diesel-electric conversion like a small version of QE2's.  It was done to make it look like QEII was economising at a time when pressure was on her to pay her way.  However I believe that the Britannia more than paid her way in promoting British interests around the world and, to be honest, making us look like we're not broke!!

There was a theory I saw banded about that if Cherie Blair had taken to cruising we would still have her. This was at a time when a possible Blairforce one was in the news. I have seen the Duke of Edinburgh quoted as saying they should have put diesels in her.

Offline June Ingram

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Re: Britannia Technical Paper
« Reply #10 on: Sep 29, 2014, 06:37 PM »
Hi Gav -

Thank you very much for your reply with detailed information, which I appreciate very much ! 

June   :)
QE2 - the ship for all of time, a ship of timeless beauty !

Online Peter Mugridge

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Re: Britannia Technical Paper
« Reply #11 on: Sep 29, 2014, 11:41 PM »
I have seen the Duke of Edinburgh quoted as saying they should have put diesels in her.

Now, I wonder where he got that idea from...  ;)
"It is a capital mistake to allow any mechanical object to realise that you are in a hurry!"

Offline June Ingram

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Re: Britannia Technical Paper
« Reply #12 on: Sep 30, 2014, 03:11 PM »
Very good, Peter... ;D
QE2 - the ship for all of time, a ship of timeless beauty !

 

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