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Search: Posts Made By: inetdog
Showing results 1 to 35 of 35
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Forum: Rumours & News
16th Jan 2014, 00:50
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Island Airphoto said The differences are...

Island Airphoto said

The differences are pretty simple.
Lead Acid and NiCd cells (even sealed ones) can tolerate a certain amount of overcharge without damage, as long as the rate and...
Forum: Rumours & News
11th Jul 2013, 22:14
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Momoe: So DH built a single test tank and...

Momoe:

So DH built a single test tank and waited a long time. Boeing has installed a test tank in each plane in the fleet. Sounds more efficient, right? :rolleyes:
Forum: Rumours & News
1st Jun 2013, 05:06
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Skyblade: Perhaps well written overall, but...

Skyblade:

Perhaps well written overall, but their mention that the forward battery is used to start the main engines seems ludicrous to me based on what I have read here and elsewhere.
The...
Forum: Rumours & News
10th May 2013, 00:31
Replies: 2,185
Views: 1,032,266
Posted By inetdog

I have been waiting for this (more CT scans) to...

I have been waiting for this (more CT scans) to surface!
A short sentence somewhat buried in the report on the CT scan of the failed battery from Boston mentioned a recommendation to do extensive...
Forum: Rumours & News
22nd Apr 2013, 15:20
Replies: 2,185
Views: 1,032,266
Posted By inetdog

poorjohn: It would indeed, but because of...

poorjohn:

It would indeed, but because of the way the battery, the contained BMU and the charger interact, any replacement would probably have to involve all three.
Given the added size and...
Forum: Rumours & News
19th Apr 2013, 22:02
Replies: 2,185
Views: 1,032,266
Posted By inetdog

cockney steve: The fasteners on the blue...

cockney steve:


The fasteners on the blue box have not changed much if at all. But the fire box which now contains the blue box has something like 30 or more screws all around the mounting flange...
Forum: Rumours & News
17th Apr 2013, 19:51
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Is this for the new, improved battery? If so can...

Is this for the new, improved battery? If so can you provide a link to the description you are working from? I have been unable to find anything more recent than the original Boeing graphics of the...
Forum: Rumours & News
12th Apr 2013, 22:49
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Old Engineer: 2. My understanding it that...

Old Engineer:


2. My understanding it that even though the two S/Gs are identical, only one of them is wired to be used for starting via the APU battery. It is not selectable. So you have two...
Forum: Rumours & News
12th Apr 2013, 05:10
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Kiskaloo, does this temporary loss of...

Kiskaloo, does this temporary loss of certification (or at least loss of confidence) restart the clock, or has the time been put in and only approval is needed?
Forum: Rumours & News
26th Mar 2013, 22:55
Replies: 2,185
Views: 1,032,266
Posted By inetdog

peter we: Comments have been made about this,...

peter we:
Comments have been made about this, and the only information I have seen is that there is undervoltage protection in the BMU at the cell level which will disconnect the battery and/or...
Forum: Rumours & News
26th Mar 2013, 18:49
Replies: 2,185
Views: 1,032,266
Posted By inetdog

fgrieu: Lithium Battery Failures...

fgrieu:

Lithium Battery Failures (http://www.mpoweruk.com/lithium_failures.htm) gives a good overview.

http://www-scf.usc.edu/~rzhao/LFP_study.pdf gives a deeper look at the normal chemistry of...
Forum: Rumours & News
25th Mar 2013, 22:25
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Pub User: Right! Professionals should...

Pub User:

Right! Professionals should confine themselves to reporting and discussing Rumors (& News), not starting them.
Now if you find a sensational tabloid rumor on the subject, I suppose you...
Forum: Rumours & News
23rd Mar 2013, 01:37
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Cool Guys: A lot of people do take the...

Cool Guys:


A lot of people do take the easy way out and say that if the chance of one engine failing it 1 in a million then the chance of two engines failing is 1 in a trillion. That does not...
Forum: Rumours & News
22nd Mar 2013, 07:48
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Ruffled Feathers!

http://dms.ntsb.gov/pubdms/search/document.cfm?docID=389173&docketID=54251&mkey=85973 :



PS: See http://www.ntsb.gov/doclib/forms/NTSB_Investigation_Party_Form.pdf for information on the...
Forum: Rumours & News
19th Mar 2013, 18:00
Replies: 2,185
Views: 1,032,266
Posted By inetdog

slf4life: Actually, they really meant a fire...

slf4life:

Actually, they really meant a fire inside the FIRE BOX.
What they are saying is that regardless of to what extent and how violently the battery melts down, and how volatile the liquid...
Forum: Rumours & News
19th Mar 2013, 00:45
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Cool Guys: Step 1. Hit the "Quote button"...

Cool Guys:

Step 1. Hit the "Quote button" (words inside a balloon icon) from the format bar in the reply screen.
Step 2. Paste in the words you want to quote.
Rinse and repeat as needed.
...
Forum: Rumours & News
18th Mar 2013, 17:41
Replies: 2,185
Views: 1,032,266
Posted By inetdog

mostlylurking: The webcast mentioned a...

mostlylurking:

The webcast mentioned a rupture disk. Very old technology which is far more likely to open before needed than to fail closed. There will also be a sensor to alarm when the disk...
Forum: Rumours & News
17th Mar 2013, 23:14
Replies: 2,185
Views: 1,032,266
Posted By inetdog

fgrieu: My reading of the Boeing...

fgrieu:


My reading of the Boeing description is rather that "deep discharge event" is a carefully phrased reference to what may have been an internal short circuit. This both reduces the cell...
Forum: Rumours & News
16th Mar 2013, 06:24
Replies: 2,185
Views: 1,032,266
Posted By inetdog

FlexibleResponse: Why do I keep misreading...

FlexibleResponse:

Why do I keep misreading that as Hindenberger? :rolleyes:
Forum: Rumours & News
16th Mar 2013, 05:50
Replies: 2,185
Views: 1,032,266
Posted By inetdog

ITman: I had a problem with that too, until...

ITman:

I had a problem with that too, until I looked very hard at the description and realized that what he was referring to was stopping the discharge at a higher voltage/State Of Charge level...
Forum: Rumours & News
14th Mar 2013, 06:41
Replies: 2,185
Views: 1,032,266
Posted By inetdog

ozaub: Are you implying that driving a nail...

ozaub:

Are you implying that driving a nail through a single cell in open air is not just as comprehensive a test as doing the same while it is in a closed box with other cells and connected to...
Forum: Rumours & News
8th Mar 2013, 20:43
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Momoe: Not necessarily. These Li-Ion...

Momoe:

Not necessarily. These Li-Ion batteries were carefully placed in secure blue boxes and monitored, which *should* have eliminated the earlier problems. They might have been viewed...
Forum: Rumours & News
8th Mar 2013, 17:39
Replies: 2,185
Views: 1,032,266
Posted By inetdog

fgrieu: To me, as I think to you, it...

fgrieu:

To me, as I think to you, it suggests that they found what may be anomalies INSIDE the main battery cells.
Good catch!
Forum: Rumours & News
8th Mar 2013, 00:52
Replies: 2,185
Views: 1,032,266
Posted By inetdog

FlightPathOBN: But was the cell inside a...

FlightPathOBN:


But was the cell inside a closed battery compartment with 7 other warm cells at the time? Or even insulated to confine the released energy?
And was the charging system pumping 45...
Forum: Rumours & News
8th Mar 2013, 00:48
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Quote: I also did not specify how much...

Quote:


I also did not specify how much brake pressure would be cranked in. It is a "proportional" system, but a little hard to guess without performance-based feedback.
Forum: Rumours & News
7th Mar 2013, 23:52
Replies: 2,185
Views: 1,032,266
Posted By inetdog

FlightPathOBN: I think that the...

FlightPathOBN:


I think that the firefighters may have been intellectually aware of how to contain the fire but gave too much weight to the directive to avoid damage to the equipment in the bay. ...
Forum: Rumours & News
7th Mar 2013, 23:45
Replies: 2,185
Views: 1,032,266
Posted By inetdog

poorjohn: And when the APU shut down, the...

poorjohn:

And when the APU shut down, the ventilation to remove the smoke from the burning battery also shut down. In flight this might not have been as serious if the ventilation was also powered...
Forum: Rumours & News
7th Mar 2013, 01:06
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Brake electrical requirement

Mk 1:


From the public graphics of the brake system, a set of motor driven actuators compress and release a group of carbon disks. The worm gear drive appears to prevent movement except under...
Forum: Rumours & News
28th Feb 2013, 18:40
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Was the actual cause of that fire during test...

Was the actual cause of that fire during test ever released? Was it perhaps a battery incident???
Forum: Rumours & News
28th Feb 2013, 08:48
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Walnut I believe this is one reason that the...

Walnut

I believe this is one reason that the APU can be started by either battery or ground power. The APU can then start the engines, one at a time.
If there is no fuel on board for the APU,...
Forum: Rumours & News
28th Feb 2013, 08:13
Replies: 2,185
Views: 1,032,266
Posted By inetdog

You can do some WYSIWIG formatting of tables by...

You can do some WYSIWIG formatting of tables by wrapping the table text inside CODE tags (The # format button in the toolbar).

Type Energy density
...
Forum: Rumours & News
27th Feb 2013, 23:22
Replies: 2,185
Views: 1,032,266
Posted By inetdog

By design, from the APU and the RAT, with the...

By design, from the APU and the RAT, with the batteries as a backup for essential systems if it comes to that.
The batteries should not be switched onto the main DC bus until after non-essential...
Forum: Rumours & News
27th Feb 2013, 17:45
Replies: 2,185
Views: 1,032,266
Posted By inetdog

poorjohn said: We also would describe an...

poorjohn said:

We also would describe an egregiously bad piece of engineering as developed by a committee of camels.
I don't think that the battery system has risen to that level yet, but I think...
Forum: Rumours & News
26th Feb 2013, 15:48
Replies: 2,185
Views: 1,032,266
Posted By inetdog

Ex Cargo Clown said: Why stop at LiMn?...

Ex Cargo Clown said:

Why stop at LiMn? LiFePO4 is even more inherently safe and has lots of accumulated use experience in abusive situations. It does not have as good an energy density or internal...
Forum: Rumours & News
25th Feb 2013, 00:12
Replies: 2,185
Views: 1,032,266
Posted By inetdog

The official explanation is that the Li battery...

The official explanation is that the Li battery can deliver enough power for several starts of the APU and then be quickly recharged again once the APU or other power source is running. NiCd's higher...
Showing results 1 to 35 of 35


 
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