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Forum: Tech Log

15th Mar 2013, 17:16

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

It makes me wonder what these people are...

It makes me wonder what these people are thinking. All the ingredients for "fire", i.e. rapid oxidation with release of heat, are present *inside* the cell. You could put a LiCo cell in a vacuum...

Forum: Tech Log

8th Mar 2013, 14:39

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

I think the BMS did detect a battery fault, as...

I think the BMS did detect a battery fault, as there was an EICAS alert to that effect around the time the APU shut down, according to the report.

Shame that there was nothing it could do to stop...

Forum: Tech Log

19th Feb 2013, 19:06

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

Aeroplanes have also been living with a means to...

Aeroplanes have also been living with a means to cut off the fuel to a burning engine for over 100 years.

If the batteries in question were installed so that they could be isolated, then doused...

Forum: Tech Log

18th Feb 2013, 22:09

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

Back-of-a-fag-packet calculation: Cell...

Back-of-a-fag-packet calculation:

Cell voltage 3.7V, capacity 65Ah, mass 2.75Kg, specific heat capacity 1,000J/KgK (guess)

(3.7 * 65 * 3600) / (1000 * 2.75) = 314K

The energy stored is...

Forum: Tech Log

15th Feb 2013, 09:33

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

Looking at the pictures of the (fresh) 787...

Looking at the pictures of the (fresh) 787 battery unit, the wiring layout and execution doesn't appear to be to the standard you might expect of a safety-critical device. Also, there seems to be...

Forum: Tech Log

9th Feb 2013, 08:16

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

I think you'll find that applies to almost all...

I think you'll find that applies to almost all news media today, in that it's bought/fed from Reuters, UPI, etc. Most of the aviation related material in cases like this comes from sources like the...

Forum: Tech Log

8th Feb 2013, 11:18

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

Mildly off-topic but the linked report from the...

Mildly off-topic but the linked report from the Daily Mail above was actually a pretty good piece of factual journalism, with a lot of material brought together plus some photos I hadn't seen before....

Forum: Tech Log

7th Feb 2013, 07:46

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

RR, Agreed. Reading through this thread...

RR,

Agreed. Reading through this thread there are many cogent theories as to why the overheat began and I have to say most of them seem at least possible.

The main question for me is: why did...

Forum: Tech Log

6th Feb 2013, 20:24

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 262,920

Posted By FullWings

I'm not sure this is a totally valid comparison....

I'm not sure this is a totally valid comparison. The fuel is inert on its own and the bleed system can be shut off as soon as abnormal temperatures are sensed. If the wings carried a mixture of LOX...

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