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Forum: Tech Log

25th Mar 2013, 08:20

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 261,824

Posted By PickyPerkins

Condensation

RetiredF4

I think you are on the right track in noting Boeing's remarks on moisture.

From memory, I think the statement was phrased something like, “During testing, we have learned that it is...

Forum: Tech Log

25th Mar 2013, 07:56

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 261,824

Posted By PickyPerkins

18 kW for 45 seconds

I see the same Aviation Week article says that the batteries will be "... subjected to repeated load tests of 18 kw over periods of 40-45 sec. ...". This looks like the same test originally specified...

Forum: Tech Log

22nd Mar 2013, 23:38

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 261,824

Posted By PickyPerkins

I believe they have tried this as part of the investigation process, but were unable

Did they try a short-circuit on the battery?
Wouldn't that release all the stored energy in short order?

Forum: Tech Log

22nd Mar 2013, 20:37

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 261,824

Posted By PickyPerkins

Ian W Thanks for the link: Boeing cannot afford to skimp on these tests

And the FAA cannot afford to skimp on these tests if they want to retain the confidence of the public.

Forum: Tech Log

22nd Mar 2013, 16:19

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 261,824

Posted By PickyPerkins

Before any test flight(s).

Before ANY test flight(s), as a simple member of the public I think it would be reasonable to see at least something along the following lines.

I understand that two of the first 787 airframes...

Forum: Tech Log

17th Mar 2013, 18:12

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 261,824

Posted By PickyPerkins

A detail in the description of the new Boeing battery box

If you have a partially full barrel of oil and keep it though several summer/winter temperature/humidity cycles you will usually find a layer of water at the bottom. During the summer humid air...

Forum: Tech Log

17th Mar 2013, 16:38

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 261,824

Posted By PickyPerkins

Syseng68k Post #1012 Total energy for APU...

Syseng68k Post #1012

Total energy for APU starts does not seem to be the problem, because even the Boeing 18kW spec. only needs about 30% of the energy stored an a fully charged battery (though...

Forum: Tech Log

17th Mar 2013, 04:28

Replies: 1,100

787 Batteries and Chargers - Part 1

Views: 261,824

Posted By PickyPerkins

What Boeing wanted vs. what Boeing got.

I have been reading parts of the FAA docket at:
Accident Investigations - NTSB - National Transportation Safety Board (http://www.ntsb.gov/investigations/dms.html).

Old stuff, but interesting.
...

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