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Search: Posts Made By: BJ-ENG
Showing results 1 to 35 of 57
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Forum: Rumours & News
2nd Aug 2015, 12:00
Replies: 918
Views: 1,117,969
Posted By BJ-ENG

2nd Aug Debris at La Reunion - Boiling Pot/Kettle

Interflug, I think you are spot on.

I suspect that what we are looking at is an early version of one of these:

Fire Maple FMC XT1 Outdoor Camping Heat Exchanger Aluminium Kettle Boil...
Forum: Rumours & News
2nd Aug 2015, 09:41
Replies: 918
Views: 1,117,969
Posted By BJ-ENG

Debris would have passed through shipping lane

Given that debris would have passed through a busy shipping lane, lets hope that a navigation warning or directive has now gone out to vessels transiting the area to keep a look out for other...
Forum: Rumours & News
15th Jan 2015, 13:51
Replies: 3,923
Views: 4,445,284
Posted By BJ-ENG

@A0283: "Before doing that, my line of thinking...

@A0283: "Before doing that, my line of thinking on water landing (before I read your reply, so there may be some duplication in it) was roughly thinking about two different and both basic...
Forum: Rumours & News
14th Jan 2015, 19:56
Replies: 3,923
Views: 4,445,284
Posted By BJ-ENG

Aerodynamic and Hydrodynamic etc

@A0283:


With respect, nothing that I have seen so far leads me to believe that the main body of the aircraft was separated from the aft section prior to impact with the surface of the ocean....
Forum: Rumours & News
12th Jan 2015, 10:33
Replies: 3,923
Views: 4,445,284
Posted By BJ-ENG

"It exploded because of the pressure," he told ...

"It exploded because of the pressure," he told reporters in the town of Pangkalan Bun on Borneo island, the search headquarters. "The cabin was pressurised and before the pressure of the cabin ...
Forum: Rumours & News
10th Jan 2015, 10:25
Replies: 3,923
Views: 4,445,284
Posted By BJ-ENG

Slightly bigger photo on this site plus a bit...

Slightly bigger photo on this site plus a bit more info.


AirAsia Flight 8501: Tail Recovered - WSJ (http://www.wsj.com/articles/airasia-flight-8501-tail-recovered-1420878809)


The...
Forum: Rumours & News
6th Aug 2014, 12:09
Replies: 1,644
Views: 2,235,409
Posted By BJ-ENG

Sudden decompression

Re: Glueball comment on quote: "Between the sudden decompression and the blast wave of the warhead detonation, it was instant for everybody."




An alternative and possibly more realistic...
Forum: Rumours & News
29th Mar 2014, 20:59
Replies: 11,831
Views: 24,200,020
Posted By BJ-ENG

Yes, Water landings are hard too!

To add to the many suggestions attempting to ponder the question regarding a water landing for any aircraft, and particularly a large wide body aircraft like a 777, it is worth pointing out some of...
Forum: Rumours & News
12th Mar 2014, 22:16
Replies: 11,831
Views: 24,200,020
Posted By BJ-ENG

T7 ditch

Quote: T7 at low speed? If it remained in one or two pieces, how long could you reasonably expect it to float?




Even at relatively low speeds, the effect of hydraulic surge will rip away...
Forum: Tech Log
11th Aug 2011, 15:33
Replies: 1,998
Views: 509,871
Posted By BJ-ENG

It may be true that seeing is believing, but just as true that believing is seeing.

@overthewing



Maybe there is something in that statement....

Article 3 - Inattentional blindness: let's not blame the victim just yet : The Canadian Aviation Maintenance Council / Le...
Forum: Tech Log
3rd Jun 2011, 19:19
Replies: 2,070
Views: 613,441
Posted By BJ-ENG

PJ2 & Gums - Nicely put.. Just to add some...

PJ2 & Gums - Nicely put..

Just to add some quotes from two publications well worth the read, and particularly relevant.

Nancy Leveson (Safeware - System safety and computers -1995)
...
Forum: Tech Log
31st May 2011, 08:41
Replies: 2,070
Views: 613,441
Posted By BJ-ENG

He must have asked and they will have explained ...

@NWR

Thanks for the Tarom ROT381 video link.

The BEA incident report (24 September 1994) makes for an interesting comparison with the current discussion.
...
Forum: Tech Log
31st May 2011, 08:02
Replies: 2,070
Views: 613,441
Posted By BJ-ENG

On the fundamental issue of the design of cockpit information systems

@ventus45



Good references - certainly worth the read..

Many thanks...
Forum: Tech Log
30th May 2011, 17:19
Replies: 2,070
Views: 613,441
Posted By BJ-ENG

Can airliners recover from a stall?

Discussion of mixed type, but worth revisiting.

Interesting, particularly post #18 and further pages.

http://www.pprune.org/tech-log/173167-can-airliners-recover-stall.html
Forum: Tech Log
29th May 2011, 19:48
Replies: 2,070
Views: 613,441
Posted By BJ-ENG

Flush Airdata Sensing (FADS) System

@Machinebird



You might find this of interest:
http://www.nasa.gov/centers/dryden/pdf/88651main_H-2379.pdf

http://www.spaceagecontrol.com/nasa-tm-104316.pdf
Forum: Tech Log
28th May 2011, 20:06
Replies: 2,070
Views: 613,441
Posted By BJ-ENG

Post #237 (Svarin) and post #260 (mm43) are both...

Post #237 (Svarin) and post #260 (mm43) are both recommended reading.

Re #237 : Svarin's speculation has a certain uncomfortable ring of truth. Protection mechanisms can be a doubled edged, and...
Forum: Tech Log
24th May 2011, 19:59
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

@Diversification Thanks for the link....

@Diversification


Thanks for the link. Nice idea, but from the description of its limitations it sounds like it would not have been of much help. One of the principles I learnt as a systems eng...
Forum: Tech Log
19th May 2011, 21:26
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

Just to add some fuel to the discussion; some...

Just to add some fuel to the discussion; some interesting quotes from NASA's initiative on Integrated Resilient Aircraft Control (IRAC) -“Stability, Maneuverability, and Safe Landing in the Presence...
Forum: Tech Log
15th May 2011, 07:53
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

"CFIS" v CFIT

Rough seas (wave height) will have some influence, but depends on alignment of aircraft fuselage relative to wave direction.

Vertical scenario: Across wave crest will provide some small...
Forum: Tech Log
13th May 2011, 22:31
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

Debris distribution

Some ideas based on MIT and US Navy studies on understanding the dynamics of three-dimensional objects freely falling through water.

As a crude rule of thumb, objects with a centre of mass...
Forum: Tech Log
8th May 2011, 21:46
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

Post-Stall and Spin Dynamics of Large Transport Aircraft

@mm43 et el

Recent NASA papers:

https://engineering.purdue.edu/~andrisan/Courses/AAE490A_S2010/Buffer/Spin/20070005804_2007005369.pdf
...
Forum: Tech Log
6th May 2011, 18:49
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

@ bearfoil I think the answer to...

@ bearfoil



I think the answer to your question is more to do with scavengers....

Bathypelagic Zone - 1000 m down to 4000m
A surprisingly large number of creatures are to be found in...
Forum: Tech Log
4th May 2011, 16:52
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

@jcjeant I think this may be galvanic...

@jcjeant


I think this may be galvanic action where the aluminium housing of the pinger is acting as an anode and is corroding rather than the ferrous cylinder. Further evidence of this is that...
Forum: Tech Log
3rd May 2011, 10:50
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

@lomapaseo If I deal with your...

@lomapaseo



If I deal with your question on pressure first; at 4000m, the pressure at that depth is 398atm, or 403 bar, or 411 kgf/cm2, or 5846psi, or 2.9tons/sqin. Starting from the point...
Forum: Tech Log
2nd May 2011, 11:34
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

Fdr/cvr data recovery

@ Noske


Thanks for that.

Interesting that the BEA had problems with memory cards and Honeywell found shorts on the board. Sounds like it could have been shock vibration damage to the die...
Forum: Tech Log
29th Apr 2011, 19:16
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

@deSitter . Don't underestimate...

@deSitter

.

Don't underestimate hydraulic damage, particularly if the object is impacting in excess of 70M/s. Take a look at the bulkhead damage for US Airways Flight 1549.
...
Forum: Tech Log
29th Apr 2011, 13:35
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

Falling objects in fluid

Drag coefficients depend on flow direction, speed, body shape, and aspect ratio. For instance, if the CG of a cylinder is the same as the centre of volume (buoyancy centre), then the cylinder will...
Forum: Tech Log
28th Apr 2011, 22:05
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

FDR CVR

@crippen




Yes, it looks like it could be there, but no doubt once it was turned over by the submersible, the truth was revealed. I think why we can see more of the PSU and drive...
Forum: Tech Log
27th Apr 2011, 08:02
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

Re: Picture in post #162

Is this one of the underfloor support members?

If so, it gives an idea of scale.

ImageShack® - Online Photo and Video Hosting (http://img841.imageshack.us/i/beavidcap003bmod.jpg/)
Forum: Tech Log
26th Apr 2011, 14:34
Replies: 2,546
Views: 933,303
Posted By BJ-ENG

HF aerials etc..

Some useful references:

http://www.key2study.com/66web/acns05.pdf

Mobile antenna systems handbook - Google Books...
Forum: Tech Log
20th Apr 2011, 17:23
Replies: 3,893
Views: 1,537,782
Posted By BJ-ENG

@bearfoil To add to the many...

@bearfoil



To add to the many suggestions attempting to answer your question regarding how the VS became detached, it is worth considering just how water impacts vary from those on hard...
Forum: Tech Log
19th Apr 2011, 08:28
Replies: 3,893
Views: 1,537,782
Posted By BJ-ENG

FDR and filtering etc: Filtered Crash Data...

FDR and filtering etc:

Filtered Crash Data on AA587 Surprising and Disappointing to NTSB (http://www.iasa.com.au/folders/Safety_Issues/dfdr-cvr/TheFDR%20story.html)
Forum: Tech Log
18th Apr 2011, 15:57
Replies: 3,893
Views: 1,537,782
Posted By BJ-ENG

Engine damage

@Turbine D



Attached is an interesting comparison showing turbine damage on two identical engines, one where most of the blades are broken off about half way between root and tip, operating...
Forum: Tech Log
13th Apr 2011, 17:17
Replies: 3,893
Views: 1,537,782
Posted By BJ-ENG

Forward motion

In the second BEA report under the section on pathology, there is a statement that forty-three of the victims, spread between business class and the rear of the aircraft, had fractures to the spinal...
Forum: Tech Log
10th Apr 2011, 10:54
Replies: 3,893
Views: 1,537,782
Posted By BJ-ENG

@mm43 Many thanks, much appreciated....

@mm43



Many thanks, much appreciated.

BJ-ENG
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