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Search: Posts Made By: syseng68k
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Forum: Rumours & News
23rd Jul 2013, 21:17
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

In fact, water, especially distilled water...

In fact, water, especially distilled water resulting from "rain", is a very poor conductor. The elt runs at low voltages as well and the chance of any serious current flowing from condensate are...
Forum: Rumours & News
16th Apr 2013, 14:00
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Old Engineer: #1624 Not quite sure what you...

Old Engineer: #1624
Not quite sure what you mean by "remain connected" in this context, but
from what I understand, the battery must be fast charged after apu start,
so that it is ready for...
Forum: Rumours & News
14th Apr 2013, 21:13
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Mac, #1611 Funny, have been looking for...

Mac, #1611

Funny, have been looking for weeks to find a list of the bmu / charger modifications,
even an overview, but can find nothing. Perhaps you could post a link or two ?...

.
Forum: Rumours & News
3rd Apr 2013, 11:44
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

I don't think we are at the end of battery...

I don't think we are at the end of battery evolution, but if you consider
that all the push has been towards higher energy densities in smaller
and lighter packages, so is there increased...
Forum: Rumours & News
2nd Apr 2013, 21:03
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

EEngr, #1512: Not forgetting, the need to...

EEngr, #1512:

Not forgetting, the need to keep critical *group* skillsets alive and within
the company, which can take years to build up. Perhaps a little
altruism as well, in terms of keeping...
Forum: Rumours & News
2nd Apr 2013, 14:15
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Old Engineer, #1505 I'm just a grumpy old...

Old Engineer, #1505

I'm just a grumpy old engineer as well and didn't mean to offend, just to
clarify what I said.

I used to have the highest respect for aviation tech, but after the system ...
Forum: Rumours & News
1st Apr 2013, 22:50
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Yes, very funny. Let's hope it's not predicting...

Yes, very funny. Let's hope it's not predicting the real future :E...
Forum: Rumours & News
1st Apr 2013, 16:11
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Old Engineer, #1498 If you look at the...

Old Engineer, #1498
If you look at the schematic in the ntsb report, it's quite clear that the
contactor is drawn with normally closed contacts, which is the contactor state
with the coil /...
Forum: Rumours & News
1st Apr 2013, 15:45
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Momoe, #1497 Correct me if i've got this by...

Momoe, #1497

Correct me if i've got this by the wrong end, but the argument seemed to
be suggesting that the battery would be run outside cell data sheet limits
to get that final reserve, which...
Forum: Rumours & News
31st Mar 2013, 21:21
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

cockney Steve, #1487 I tend to agree. I...

cockney Steve, #1487

I tend to agree. I different sort of "enough of the bo***cks", right ?.
You can only take things so far via the use of diplomacy :ugh:

The number of areas that have been...
Forum: Rumours & News
25th Mar 2013, 16:30
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

The other thing about statistics and mtbf is that...

The other thing about statistics and mtbf is that the figure is not time to next failure.
That is, the mtbf may be calculated as 1 in 10 e6 hours, but that single failure could
happen today,...
Forum: Rumours & News
20th Mar 2013, 12:37
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

The problem with aviation kit is that it's become...

The problem with aviation kit is that it's become more about the process
than the end result. The "Medium is the Message", as McLuhan used to say.
Yes, it does meet the spec down to the last...
Forum: Rumours & News
13th Mar 2013, 14:06
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

HighWind, #1239 Circuit breakers can...

HighWind, #1239


Circuit breakers can fail, but imho, an electronic solution driving a contactor
is not enough on it's own, since the contactor coil drive transistor itself can
fail short...
Forum: Rumours & News
9th Mar 2013, 17:48
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

language isn't the issue, since the language is...

language isn't the issue, since the language is simply there to express
a solution to a problem. After all, you want to program solutions to the
problem, not get a first in processor architecture...
Forum: Rumours & News
9th Mar 2013, 12:47
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Mark in Ca: How about: "Selective...

Mark in Ca:

How about: "Selective generalisations of the facts to support his case, from someone
who obviously has no idea what he's talking about, but may have his own agenda".

Sorry, but it...
Forum: Rumours & News
24th Feb 2013, 23:22
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Melting point of Titanium is around 1700 C, not...

Melting point of Titanium is around 1700 C, not that much different from Stainless
Steel and it would probably take much more to make it burn, though no metallurgist.

Fwir, steel heated to...
Forum: Rumours & News
24th Feb 2013, 14:15
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

green granite: I'm sure it will be a great...

green granite:

I'm sure it will be a great aircraft, and I would fly in it, but with the proviso that if
Boeing are starting to go the way of companies like Microsoft, where the last
stage of...
Forum: Rumours & News
23rd Feb 2013, 20:57
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

deptrai: Part of it seems more likely to be to...

deptrai:
Part of it seems more likely to be to fix fundamental flaws in the original design of
the battery subsystem.

If more modern technology with a higher than average risk factor is to be...
Forum: Rumours & News
17th Feb 2013, 18:10
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

poorjohn: This struck a chord with me: ...

poorjohn:

This struck a chord with me:

Boeing's Real Problem With the Dreamliner: Bean Counter vs. Engineer - James Fallows - The Atlantic...
Forum: Rumours & News
15th Feb 2013, 14:37
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

C/mon guys, haven't we been through all this...

C/mon guys, haven't we been through all this stuff about cells ad nauseum already ?.

Boeing should stick with lithium imho. Just bring in some decent systems engineering
bods to fix the problem...
Forum: Rumours & News
9th Feb 2013, 23:42
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Lyman: Sorry, have been posting to tech log...

Lyman:

Sorry, have been posting to tech log and r&n and didn't make a note of which it
was posted in. Try tech log...
Forum: Rumours & News
9th Feb 2013, 23:00
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Lyman: Here's one: 26th January, #161,...

Lyman:

Here's one:

26th January, #161, tech log

All in all, not impressed. Boards and connectors of that type should
never be located anywhere near cells and their contents...

.#164,...
Forum: Rumours & News
9th Feb 2013, 22:19
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

RR_NDB: I do remember that :hmm: Can...

RR_NDB:


I do remember that :hmm:

Can you refer me back to that post, so I can comment on the context ?. My position
was and still is, that the problem is fundamentally that of battery...
Forum: Rumours & News
8th Feb 2013, 22:24
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

EEngr: I would think that they at least had a...

EEngr:
I would think that they at least had a fully instrumented test rig in house
for the battery subsystem, including expected worst case load profiles such
as apu starting and fast charging....
Forum: Rumours & News
8th Feb 2013, 19:02
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

EEngr: Very good point. Power density...

EEngr:

Very good point.

Power density is much higher for LI and the thinner separator material might
be prone to high voltage transients. Separator breaks down enough to negate
self healing,...
Forum: Rumours & News
7th Feb 2013, 22:46
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

llagonne66: Probably close to the truth. If...

llagonne66:
Probably close to the truth. If outsourcing is so fashionable these days, perhaps the
FAA did that as well ?.

But, who watches the watchers ? :confused:
Forum: Rumours & News
7th Feb 2013, 18:00
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

llagonne: Thanks for that. Some nice new...

llagonne:

Thanks for that. Some nice new pics, but no real substance otherwise ?...
Forum: Rumours & News
6th Feb 2013, 23:49
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Piper Driver: Agreed - I've been thinking...

Piper Driver:

Agreed - I've been thinking that the only way to reproduce the fault would be
to build a test rig with battery, charger and associated kit, then put it through
test cycles that...
Forum: Rumours & News
29th Jan 2013, 22:34
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

RR_NDB Let's get started: Electrics,...

RR_NDB

Let's get started: Electrics, hydraulics or pneumatics, are
all means to transfer energy from one place to another. Electrics
are far more efficient and have less weight than either of...
Forum: Rumours & News
29th Jan 2013, 11:17
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

deptrai: ...and so do I. It's a very...

deptrai:

...and so do I. It's a very advanced design from the info available.
There's no progress without change and as technology and engineering solutions
become ever more complex, so will...
Forum: Rumours & News
28th Jan 2013, 21:53
Replies: 2,185
Views: 1,032,226
Posted By syseng68k

Apologies, deleted that post because it should...

Apologies, deleted that post because it should have been sent to tech log as
a follow up to a previous post :uhoh:

cwatters:

They must have some sort of diagnostics internal to the charger /...
Showing results 1 to 31 of 31


 
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