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Search: Posts Made By: poorjohn
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Forum: Rumours & News
20th Jun 2013, 16:08
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

The charging system probably needed better...

The charging system probably needed better feedback from the battery pack, overlooked or denied due to increased cost and complexity outweighing need. I think (strictly from reading this thread)...
Forum: Rumours & News
19th May 2013, 16:27
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Kinda sad that in what must be an "on our very...

Kinda sad that in what must be an "on our very best behavior" high-visibility period for Boeing stuff like this still happens. If a specialist team can't do better than that, how do the daily grunts...
Forum: Rumours & News
17th May 2013, 15:38
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

IIRC there's a wire mesh imbedded in the skin....

IIRC there's a wire mesh imbedded in the skin. There was controversy regarding the electrical bonding between segments at one point. I suppose the flight test program demanded a certain number of...
Forum: Rumours & News
22nd Apr 2013, 12:57
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Is that a very unique penetration of the...

Is that a very unique penetration of the pressurized hull? Presumably heavy (lest it rupture under pressure of the energy being released in the box), potentially very hot, relatively long and rigid....
Forum: Rumours & News
21st Mar 2013, 11:48
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

There are several articles in the public press...

There are several articles in the public press saying that Boeing will conduct two test flights approximately this weekend, and that the new system will be / has been subjected to the 2008 RTCA...
Forum: Rumours & News
20th Mar 2013, 04:01
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Safety of the modified system will surely be...

Safety of the modified system will surely be demonstrated by analysis, and the white paper has almost certainly already been written, by someone with an impeccable reputation, and approved by a lot...
Forum: Rumours & News
8th Mar 2013, 16:52
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Not so in the colonies

Cows: In the US the NTSB makes recommendations. As an independent agency with its own body of expertise, the FAA sometimes does not follow them.

I'm sure someone will explain it better but I...
Forum: Rumours & News
7th Mar 2013, 19:48
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

After start, APU still needs battery to operate

Per the NTSB report, after the APU starts, the APU battery must continue to supply power to the APU control electronics. When the JAL battery failed, the APU shut down.
Forum: Rumours & News
27th Feb 2013, 16:55
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Thales 2005 hoot about selecting the greatest battery in the history of aviation

http://www.s399157097.onlinehome.us/PDFS/BoeingPR_06_12_2005.pdf
Note from this 2005 document that Thales says they selected the battery - of course they might have had guidance from their customer....
Forum: Rumours & News
25th Feb 2013, 01:49
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

I've been poking around trying to learn which of...

I've been poking around trying to learn which of those "facts" about various batteries are true, without much luck. The wikipedia article is not very satisfying, and I don't know the merits of this...
Forum: Rumours & News
23rd Feb 2013, 22:46
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Adding ~100 lbs* of 1/2"-thick stainless steel...

Adding ~100 lbs* of 1/2"-thick stainless steel fireproof case (as reported by sources not permitted to report such things) plus miscellaneous paraphenalia to permit the occasional battery to "safely"...
Forum: Rumours & News
23rd Feb 2013, 16:57
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Standing behind my usual claim of ignorance, I'd...

Standing behind my usual claim of ignorance, I'd guess that NiCd would be fine in the APU-battery role, and it's lithium just to keep the LRU count down. The real requirements for the two batteries...
Forum: Rumours & News
22nd Feb 2013, 17:22
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

When is either battery essential? Loss of...

When is either battery essential?

Loss of both engines has to be "impossible" for ETOPS; is it not equally "impossible" that power from at least one generator [on one remaining engine] will not...
Forum: Rumours & News
20th Feb 2013, 00:07
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Any replacement battery needs to be capable of...

Any replacement battery needs to be capable of braking the airplane to a stop (under extreme weight and speed conditions, if they were honest in the specs).

People who know batteries (that's not...
Forum: Rumours & News
18th Feb 2013, 20:15
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Does failure of either battery during ETOPS...

Does failure of either battery during ETOPS mandate immediate diversion?
Forum: Rumours & News
18th Feb 2013, 07:27
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

This AvWeek on-line article dated 2/15 - AvWeek...

This AvWeek on-line article dated 2/15 - AvWeek article (http://www.aviationweek.com/Article.aspx?id=/article-xml/avd_02_15_2013_p03-01-549218.xml) - apparently pre-dates the up-thread mention of a...
Forum: Rumours & News
17th Feb 2013, 16:02
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Hopefully someone with pertinent knowledge will...

Hopefully someone with pertinent knowledge will jump in to offer an explanation for why a (hopefully) growing fleet of expensive aircraft would be allowed to remain grounded for months for want of an...
Forum: Rumours & News
16th Feb 2013, 21:51
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

mm43: I appreciate the additional input but only...

mm43: I appreciate the additional input but only a couple of the points as noted below might argue for NiCd vs NiMH for aircraft use, so I still wonder what really drives the designers in that...
Forum: Rumours & News
16th Feb 2013, 16:19
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Since this thread has gotten to be much about...

Since this thread has gotten to be much about battery technology I feel free to ask "why NiCd (as mentioned upthread re A350 etc) and not NiMH?"

Wikipedia says in part "A NiMH battery can have...
Forum: Rumours & News
8th Feb 2013, 19:46
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Eengr - as I mentioned in a previous post, some...

Eengr - as I mentioned in a previous post, some large aerospace companies have replaced expertise with process, so the grey-beard who ran the department, was fanatical about every detail of "his"...
Forum: Rumours & News
8th Feb 2013, 17:10
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

EEngr, fascinating point about the AC...

EEngr, fascinating point about the AC characteristics of the battery. Is it well-enough-known in the field so that "everyone" will realize they have to consider it in their design?
Forum: Rumours & News
8th Feb 2013, 16:44
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Disappointing that engineering at the...

Disappointing that engineering at the arguably-best transport-aircraft company on the planet led itself down this path - and got it so wrong. Given that, can we trust the objectivity of the 2007...
Forum: Rumours & News
3rd Feb 2013, 18:20
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Those who've worked in aerospace manufacturing...

Those who've worked in aerospace manufacturing over the past few decades will realize the truths in the HBR article.

When management perceives their company to be operating in a high-cost arena...
Forum: Rumours & News
31st Jan 2013, 16:52
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

So no more than 3 oz of liquid in cabin bag, but...

So no more than 3 oz of liquid in cabin bag, but an arbitrary amount of "batteries" allowed? The (wrong) possibilities are endless. Brilliant.
Forum: Rumours & News
26th Jan 2013, 15:22
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

What happens to a composite hull (787-style) when...

What happens to a composite hull (787-style) when locally heated to an appropriately high temperature by e.g. molten metal? A self-limiting hole, uncontrolled conflagration, something in between?
Forum: Rumours & News
21st Jan 2013, 23:47
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

glenbrook: Do I incorrectly recall that the...

glenbrook:
Do I incorrectly recall that the battery weighs some 65 lbs? Adding another 200 lbs doesn't seem significant. (Guessing that the APU battery was identical to the Main for spares...
Forum: Rumours & News
19th Jan 2013, 16:12
Replies: 2,185
Views: 1,032,245
Posted By poorjohn

Not to belabor the point but at a moment when...

Not to belabor the point but at a moment when your device is operating and the battery is being charged, the charger is doing all the work.
Showing results 1 to 27 of 27


 
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