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Search: Posts Made By: Machinbird
Showing results 1 to 9 of 9
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Forum: Tech Log
23rd Mar 2013, 01:42
Replies: 1,100
Views: 260,993
Posted By Machinbird

Just speculating here............with regard to...

Just speculating here............with regard to the original 787 battery design.
Probably the easiest way to overstress a battery cell, without this being detected by the battery monitoring unit...
Forum: Tech Log
15th Mar 2013, 00:47
Replies: 1,100
Views: 260,993
Posted By Machinbird

Wouldn't the battery take up a considerable...

Wouldn't the battery take up a considerable volume with all those additional features?
How would you propose to detect that a portion of the battery's capacity has taken a vacation? Are you sure...
Forum: Tech Log
11th Mar 2013, 04:36
Replies: 1,100
Views: 260,993
Posted By Machinbird

saptzae Referring to the Boston battery...

saptzae
Referring to the Boston battery failure,No one knows what temperature the cell that initially failed was at just prior to failure. The fact that the short appears to have occurred on the...
Forum: Tech Log
11th Mar 2013, 01:03
Replies: 1,100
Views: 260,993
Posted By Machinbird

Battery temperature sensing

It is clear that battery temperature sensing was inadequate. To my mind, rather than an external temperature sensor, each cell needed an internal temperature sensor near its center of mass.
...
Forum: Tech Log
30th Jan 2013, 01:20
Replies: 1,100
Views: 260,993
Posted By Machinbird

radken I believe you have muddied up the...

radken
I believe you have muddied up the details of the Everglades (Valujet) DC-9 crash.
There was a skid of loose oxygen generating canisters that was implicated in that onboard fire.
Forum: Tech Log
30th Jan 2013, 01:15
Replies: 1,100
Views: 260,993
Posted By Machinbird

Really agree with this statement by Elon Musk as...

Really agree with this statement by Elon Musk as linked in Airman1900's post.
"They believe they have this under control, although I think there is a fundamental safety issue with the architecture...
Forum: Tech Log
27th Jan 2013, 17:26
Replies: 1,100
Views: 260,993
Posted By Machinbird

Question After looking at the picture of the exemplar...

After looking at the picture of the exemplar battery in the NTSB report, one thing puzzles me about the smaller monitoring wires. There appear to be 3 wires that are attached to electrically...
Forum: Tech Log
27th Jan 2013, 16:41
Replies: 1,100
Views: 260,993
Posted By Machinbird

Lyman If you will recall, NTSB is independent...

Lyman
If you will recall, NTSB is independent of FAA, and makes recommendations as they see fit on incidents that are within their purview. These also include rail, highway and pipeline incidents. ...
Forum: Tech Log
27th Jan 2013, 05:54
Replies: 1,100
Views: 260,993
Posted By Machinbird

The below is a screen grab from the NTSB briefing...

The below is a screen grab from the NTSB briefing on the Boston battery failure:

http://home.comcast.net/~shademaker/BatteryShort.png

The circle marks the location of an electrical short that...
Showing results 1 to 9 of 9


 
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