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Search: Posts Made By: Speed of Sound
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Forum: Rumours & News
2nd Jul 2013, 14:37
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Has the criteria for shutdown been made more...

Has the criteria for shutdown been made more strict?

My understanding is that the criteria has remained the same but the charging minimum voltage has been increased to prevent the battery going...
Forum: Rumours & News
28th Jun 2013, 12:21
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

It depend on what you mean by a 'fix'. The...

It depend on what you mean by a 'fix'.

The previously high number of units going u/s will almost certainly reduce, as the usable voltage range has been limited to prevent overcharging and charging...
Forum: Rumours & News
28th Jun 2013, 09:25
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Probably because the mis-bored oil stub pipes...

Probably because the mis-bored oil stub pipes have been identified and replaced on all Trent 900s.

RR have also re-programmed the FADEC to shut off fuel to an engine where an IP turbine overspeed...
Forum: Rumours & News
29th Apr 2013, 16:45
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Unlikely, as the Yuasa LVP65 cell has been around...

Unlikely, as the Yuasa LVP65 cell has been around for over eight years now and seems to work fine in other applications.
Forum: Rumours & News
24th Apr 2013, 12:59
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

I'm assuming those figures don't include any...

I'm assuming those figures don't include any compensation payouts to customers or battery re-design and re-fit costs which will presumably be put into the next quarter. ;-)
Forum: Rumours & News
20th Apr 2013, 10:33
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

cockney steve

I assume that the 'old units' will be stripped down and the good LVP cells re-used or sent back to Yuasa.

Also, even if they did fit the new containment box the monitoring on the new batteries is...
Forum: Rumours & News
18th Mar 2013, 23:15
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Cool Guys, TURIN et al.

Sorry about the size of the picture guys.

You can't upload photos on this forum so it is a link to a high definition pic. I have now downloaded it, resized it and uploaded and linked to my...
Forum: Rumours & News
18th Mar 2013, 19:47
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

I'm sorry but that has got to be four times the...

I'm sorry but that has got to be four times the size and twice the weight of the lead acid battery that will start my 3.5 litre diesel car! :ugh:
...
Forum: Rumours & News
15th Mar 2013, 13:46
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Not to me it doesn't. It was already in the...

Not to me it doesn't.

It was already in the public domain that this particular battery chemistry is more prone to failure at the upper and lower limits of its capacity. If a cause had been found...
Forum: Rumours & News
27th Feb 2013, 12:13
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

And that is a problem Boeing will have if this...

And that is a problem Boeing will have if this ludicrous 'stronger box' solution is even considered by the FAA.

It is quite easy to force a problem by overcharging a battery or to try to charge a...
Forum: Rumours & News
26th Feb 2013, 20:54
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

EEngr

That is why this whole 'temporary certification' thing is a complete fantasy.

The only way to avoid what EEngr is predicting from becoming fact, is if the temporary certification comes with a time...
Forum: Rumours & News
21st Feb 2013, 12:59
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

If it is simply wiring up a new battery, this...

If it is simply wiring up a new battery, this could feasibly be done by Thales/Securaplane employees supervised by Boeing staff. A revised algorithm or software tweek would be done and tested by the...
Forum: Rumours & News
21st Feb 2013, 12:22
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

They would be very foolish to stop production. ...

They would be very foolish to stop production.

These are firm orders and it is strictly cash on delivery. Running out of space is not an issue. The US is very big and space can be found. I'm sure...
Forum: Rumours & News
21st Feb 2013, 04:52
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

I have now read two different versions of this...

I have now read two different versions of this story! :-(

One says that the APU was incorrectly connected to the main battery and the other says that the APU battery was incorrectly connected to...
Forum: Rumours & News
20th Feb 2013, 13:58
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Or not, depending on whether you believe Boeing...

Or not, depending on whether you believe Boeing or JAL/ANA.

If Boeing are saying that they are now physically and thermally separating individual 'cells' as their 'interim fix', then I guess they...
Forum: Rumours & News
20th Feb 2013, 12:09
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

As do pretty much all trucks. Lose air pressure...

As do pretty much all trucks. Lose air pressure and your breaks are locked on.

Not sure that having brakes' locked on' is a good failsafe. Just as hydraulic systems have an accumulator which will...
Forum: Rumours & News
17th Feb 2013, 12:55
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Forgotten? If it was ever there in the first...

Forgotten?

If it was ever there in the first place. I was talking to someone who flies almost as much as I do, about AF 447 and he had no idea what I was talking about.



It was, which is why...
Forum: Rumours & News
15th Feb 2013, 11:57
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Sadly not! :-( ...

Sadly not! :-(

http://www.straitstimes.com/sites/straitstimes.com/files/photo_1360260658689-1-0.jpg
Forum: Rumours & News
11th Feb 2013, 09:41
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Peak current draw will only be for a fraction of...

Peak current draw will only be for a fraction of the minute or so of the start up, especially with soft starts designed to reduce high torque induced damage of starter shafts.
Forum: Rumours & News
9th Feb 2013, 14:25
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Given that Boeing and the NTSB have moved on from...

Given that Boeing and the NTSB have moved on from the battery to the monitoring, charging and other systems around it, I'm not sure you can describe the battery as 'WRONG'.

SoS
Forum: Rumours & News
8th Feb 2013, 14:43
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

I'm not even sure they will be looking for that. ...

I'm not even sure they will be looking for that.

That would be an open-ended project that could take months of 'incident-free' flying before seeing something out of the ordinary. As Hazel says,...
Forum: Rumours & News
1st Feb 2013, 13:23
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

...but doesn't provide as much energy per kilo...

...but doesn't provide as much energy per kilo per cubic metre. :-)

Are the electrical specifications for the 787 in the public domain yet?

SoS
Forum: Rumours & News
31st Jan 2013, 14:27
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Or the other way round! ;) You are right...

Or the other way round! ;)

You are right though about the need to take a holistic look. Most industrial batteries are constantly under load and therefore to keep them in service they are...
Forum: Rumours & News
31st Jan 2013, 12:02
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

When people are talking about 'defective'...

When people are talking about 'defective' batteries and 'new technology', can we remember that the units installed on the 787 are made up of 8 x LVP65 cells which have been used successfully in...
Forum: Rumours & News
30th Jan 2013, 19:37
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

I suspect that to be the case. If these...

I suspect that to be the case.

If these batteries were being flagged up by the system as 'below minimum voltage/discharged' and simply being swapped out for new units under warranty, the...
Forum: Rumours & News
30th Jan 2013, 17:51
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

In that case if the claim that over 100 787...

In that case if the claim that over 100 787 batteries have needed to be replaced in a relatively small number of aircraft is true. then either Boeing has been hiding this from the regulator or the...
Forum: Rumours & News
30th Jan 2013, 16:19
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Lyman

Only in the US.

The ANA source says that battery replacement was not a matter for the regulator and only Boeing were informed.
Forum: Rumours & News
30th Jan 2013, 15:36
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

An ongoing problem for Boeing?

If these batteries were being replaced then they weren't just going 'service low', they were going critically low ie the point at which they can no longer be recharged and basically become very...
Forum: Rumours & News
29th Jan 2013, 17:35
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

I'm not a betting man but if I were, my money...

I'm not a betting man but if I were, my money would be on Li-Mn! :ok:
Forum: Rumours & News
21st Jan 2013, 16:52
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Slightly off topic but a close friend of mine was...

Slightly off topic but a close friend of mine was heavily involved in the Millennium Dome project and as it got ever closer to Dec 31st 1999, panic set in and all sorts of technical and safety rules...
Forum: Rumours & News
21st Jan 2013, 14:37
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

Teach Me

The charging/maintenance set-up for a laptop battery is tried and tested technology.

Even when Sony recalled the batteries for the old Apple Powerbook, there had only been two of them known to...
Forum: Rumours & News
21st Jan 2013, 13:42
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

HalloweenJack

I have a diagram of the layout of the Aft EE Bay but despite having an 'insert image' icon above, there seems to be no way to upload an image to a post. :{

The bay is made up of three sections....
Forum: Rumours & News
18th Jan 2013, 17:56
Replies: 2,185
Views: 1,032,246
Posted By Speed of Sound

No I think he meant what he said which was that...

No I think he meant what he said which was that the design REQUIRED these batteries.

When the electrical system had been designed (requiring something like 1 MW of power!) the high energy density...
Showing results 1 to 33 of 33


 
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