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Forum: Tech Log

17th Aug 2006, 23:38

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

At those magnifications you're actually pushing...

At those magnifications you're actually pushing the scanned document - because it seems to be a scan, not an actual generated file - to the limits of resolution. That in itself is a source of error...

Forum: Tech Log

17th Aug 2006, 20:00

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

It isn't "jumping" - it's changing at a rate...

It isn't "jumping" - it's changing at a rate faster than the plot is capable of showing other than as a jump, especially when combined with the discrete sampling of the FDR data aquisition system.
...

Forum: Tech Log

16th Aug 2006, 16:19

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

To answer that and the subsequent post; it is...

To answer that and the subsequent post; it is probably possible (based admittedly on other types, but control power to inertia tends to be a fairly stable parameter for civil designs) to generate a...

Forum: Tech Log

16th Aug 2006, 11:23

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

The graph in the FDR plot is up=positive; I was...

The graph in the FDR plot is up=positive; I was trying to caution you that if/when you read up on some flight mechanics, be prepared for some sign convention issues...

the one in bold,...

Forum: Tech Log

16th Aug 2006, 01:25

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

Somewhat off the topic, but this might help...

Somewhat off the topic, but this might help illustrate why you can't use an FDR to deduce intentions and can get led astray easily.

Postulate:

We have FDR data for an airliner, which crashed...

Forum: Tech Log

16th Aug 2006, 01:13

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

Not quite. If you really want to understand...

Not quite. If you really want to understand flight dynamics I suggest you pick up a stability and control textbook; most good libraries or bookstores, certainly in any university town, will have...

Forum: Tech Log

15th Aug 2006, 12:12

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

Invariably the latter.

Invariably the latter.

Forum: Tech Log

15th Aug 2006, 12:11

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

You did read the scale correctly, it shows peak...

You did read the scale correctly, it shows peak values of normal accel of 3-4'g' and minima of -1 to -2 'g' occurring three times each in the final few minutes.

Look at the pitch attitude - called...

Forum: Tech Log

15th Aug 2006, 05:18

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

As a technical item, you simply cannot extract...

As a technical item, you simply cannot extract the kind of conclusions you are implying from that data.

1. Its an incredibly compressed scale in terms of presentation, and so VERY difficult to...

Forum: Tech Log

12th Aug 2006, 18:28

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

OK, I'll bite. Assuming that the aircraft...

OK, I'll bite.

Assuming that the aircraft location data is accurate, which is as previousl;y stated not a given, there is no way to state that a particular set of locations at such a distance from...

Forum: Tech Log

11th Aug 2006, 15:12

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

I have not attempted to read through all the...

I have not attempted to read through all the posts here, but would simply caution that on a technical basis, trajectory predictions are very much non-trivial. Even with data obtained directly from...

Forum: Tech Log

7th Aug 2006, 11:34

Replies: 186

United Flight 93, What actually happened ? [somewhat edited by JT]

Views: 33,836

Posted By Mad (Flt) Scientist

Vmo isn't much to do with drag - it's mainly to...

Vmo isn't much to do with drag - it's mainly to do with lift. The drag is very unlikely to break anything meaningful - but the wings are definitely capable of creating more than enough lift to break...

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