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Search: Posts Made By: Garrison
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Forum: Tech Log
5th Jun 2011, 20:14
Replies: 2,070
Views: 616,274
Posted By Garrison

speeds and angles

I am sorry if this is redundant. I have been on and off here and have not had time to read every single message.

In an effort to investigate the difference between the data at point 6, 2:11:40...
Forum: Tech Log
3rd Jun 2011, 03:02
Replies: 2,070
Views: 616,274
Posted By Garrison

mm43 You mean your graphic and his second...

mm43


You mean your graphic and his second one. Agreed. I'm talking about the differences between his first one and his second one, which are quite significant.
Forum: Tech Log
3rd Jun 2011, 02:38
Replies: 2,070
Views: 616,274
Posted By Garrison

mm43 No no, your graphic is great (don't...

mm43


No no, your graphic is great (don't quite agree about pitot behavior, but that's a small matter when they're frozen anyway) but if you compare it with Turtle's you see that the two sets of...
Forum: Tech Log
3rd Jun 2011, 02:31
Replies: 2,070
Views: 616,274
Posted By Garrison

I wish there were some aero guys contributing to...

I wish there were some aero guys contributing to this thread. It's interesting, and revealing, that a bunch of Airbus pilots hunched over their keyboards in the safety of their homes can argue so...
Forum: Tech Log
3rd Jun 2011, 02:11
Replies: 2,070
Views: 616,274
Posted By Garrison

Well, that's the point. The numbers BEA gives for...

Well, that's the point. The numbers BEA gives for the steady-state descent are incompatible with the groundspeed at impact. Either something changed at low altitude, or the numbers are not reliable.
Forum: Tech Log
3rd Jun 2011, 02:06
Replies: 2,070
Views: 616,274
Posted By Garrison

Whew! Thanks a million. But what do you mean...

Whew! Thanks a million. But what do you mean about 10,000 fpm being twice the BEA number? It is the BEA number.
Forum: Tech Log
3rd Jun 2011, 01:47
Replies: 2,070
Views: 616,274
Posted By Garrison

How do you post a picture? I drew one, it's a...

How do you post a picture? I drew one, it's a JPG, but I don't know how to insert it into a message. The "Insert image" icon asks for a URL.
Forum: Tech Log
3rd Jun 2011, 01:34
Replies: 2,070
Views: 616,274
Posted By Garrison

bearfoil... I feel like Alice in...

bearfoil...


I feel like Alice in Wonderland, except I'm a guy.

It's not 55, it's 25. Please please please draw a picture of an airplane, side view, nothing fancy, with its nose tilted upward...
Forum: Tech Log
3rd Jun 2011, 01:27
Replies: 2,070
Views: 616,274
Posted By Garrison

Can anyone clarify for me the operation of the...

Can anyone clarify for me the operation of the AoA system? The real angle of attack must be obtained from a lookup table that translates the vane position into actual alpha. How far does the lookup...
Forum: Tech Log
3rd Jun 2011, 00:09
Replies: 2,070
Views: 616,274
Posted By Garrison

Yes, and with 16 degrees nose up that gives an...

Yes, and with 16 degrees nose up that gives an AoA of 61 degrees as asserted by gums. But the BEA numbers for most of the descent -- pitch 15, AoA 35-40 -- imply a much shallower descent. The...
Forum: Tech Log
2nd Jun 2011, 23:41
Replies: 2,070
Views: 616,274
Posted By Garrison

Not on this planet. You have to add the pitch...

Not on this planet. You have to add the pitch angle to the negative of the flight path angle to get the angle of attack (assuming that the flight path angle is negative for a descent).

With regard...
Forum: Tech Log
2nd Jun 2011, 22:59
Replies: 2,070
Views: 616,274
Posted By Garrison

Vertical velocity is 170 ft/sec, and a 2G pullout...

Vertical velocity is 170 ft/sec, and a 2G pullout would subtract 32 fps from that every second. Let's say 6 seconds, during which you would lose quite a bit less than 1,000 feet. Doesn't sound as if...
Forum: Tech Log
2nd Jun 2011, 21:35
Replies: 2,070
Views: 616,274
Posted By Garrison

Yup. (+ six additional characters)

Yup. (+ six additional characters)
Forum: Tech Log
2nd Jun 2011, 21:18
Replies: 2,070
Views: 616,274
Posted By Garrison

Either the information provided by the BEA is...

Either the information provided by the BEA is inaccurate, or I have forgotten my trig, or there is a persistent misunderstanding on this thread about the attitude and flight path. The BEA report says...
Forum: Tech Log
30th May 2011, 23:41
Replies: 2,070
Views: 616,274
Posted By Garrison

Machinbird: Agree entirely. If it's true...

Machinbird:


Agree entirely. If it's true about the Captain recognizing that the airplane was stalled, then everything comes down to that trim wheel -- unless, of course, the A330 turns out to...
Forum: Tech Log
30th May 2011, 23:32
Replies: 2,070
Views: 616,274
Posted By Garrison

"Entre 1 h 59 min 32 et 2 h 01 min 46, le...

"Entre 1 h 59 min 32 et 2 h 01 min 46, le commandant de bord assiste au briefing entre les deux copilotes..."

from the BEA interim report
Forum: Tech Log
30th May 2011, 22:45
Replies: 2,070
Views: 616,274
Posted By Garrison

In French assister means to witness or be present...

In French assister means to witness or be present at an event.
Forum: Tech Log
30th May 2011, 21:45
Replies: 2,070
Views: 616,274
Posted By Garrison

An updraft would initially increase the angle of...

An updraft would initially increase the angle of attack, and the airplane, being statically stable (one hopes) would react by pitching down in order to regain its trimmed angle of attack. What...
Forum: Tech Log
30th May 2011, 16:53
Replies: 2,070
Views: 616,274
Posted By Garrison

Why is there all this talk about being "locked...

Why is there all this talk about being "locked in" a "super stall"? If the stick had been held forward and the trim wheel rolled AND and the plane had failed to recover, this would make sense; but...
Forum: Tech Log
30th May 2011, 16:35
Replies: 3,435
Views: 1,674,654
Posted By Garrison

"The aircraft pitched up steeply and decelerated...

"The aircraft pitched up steeply and decelerated from cruise speed to a virtual standstill in the first 30 seconds or so, then went from about 80 mph up to over 100 mph down. None of that would have...
Forum: Tech Log
30th May 2011, 15:33
Replies: 2,070
Views: 616,274
Posted By Garrison

With regard to the "deep stall" idea here, if the...

With regard to the "deep stall" idea here, if the PF applied ANU command all the way to the surface, why is it necessary to invoke a hypothetical (and unlikely) unrecoverable deep stall? Between the...
Forum: Tech Log
29th May 2011, 17:51
Replies: 3,435
Views: 1,674,654
Posted By Garrison

There are all sorts of possibilities, including...

There are all sorts of possibilities, including an unreported (by ACARS) tail deice failure, but a good Occamite would say that what we have here is sufficient unto itself. The vulnerability of the...
Forum: Tech Log
29th May 2011, 16:26
Replies: 3,435
Views: 1,674,654
Posted By Garrison

> Could the crew break the stall, even if they...

> Could the crew break the stall, even if they had recognized it? With an
AOA of more than 40° that wouldn't have been to easy: With practically
no clean airflow over the elevators (close to a flat...
Forum: Tech Log
29th May 2011, 15:04
Replies: 3,435
Views: 1,674,654
Posted By Garrison

If you think about what could have been done to...

If you think about what could have been done to prevent this accident, rather than about whether the crew were competent/incompetent or whatever, it seems as though if they had had available the...
Forum: Tech Log
28th May 2011, 15:24
Replies: 2,070
Views: 616,274
Posted By Garrison

backup?

It seems odd that loss of the pitots should cause the whole system to become unworkable. Is there any sort of backup, eg inertial? I know there are three pitots, but if one can be overwhelmed by ice,...
Forum: Tech Log
28th May 2011, 05:04
Replies: 3,435
Views: 1,674,654
Posted By Garrison

stall recovery

I'm a light airplane guy and don't know much about this, so forgive me if this is nonsense, but it strikes me that the A330 displayed remarkably good post-stall behavior -- no departure, no spin. It...
Showing results 1 to 26 of 26


 
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