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Search: Posts Made By: BJ-ENG
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Forum: Tech Log
24th May 2011, 19:59
Replies: 2,546
Views: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
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: 938,279
Posted By BJ-ENG

HF aerials etc..

Some useful references:

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

Mobile antenna systems handbook - Google Books...
Showing results 1 to 14 of 14


 
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