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Search: Posts Made By: awblain
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Forum: Tech Log
13th Mar 2014, 09:28
Replies: 813
Views: 153,888
Posted By awblain

"It's a special bird indeed" Well… Maybe. ...

"It's a special bird indeed"

Well… Maybe.

During that time was it gaining thrust? If so, then increasing the angle of attack, and thus drag, keeping the potential and kinetic energy constant,...
Forum: Tech Log
3rd Mar 2014, 21:27
Replies: 813
Views: 153,888
Posted By awblain

Well, the answer is "far too late" to the first,...

Well, the answer is "far too late" to the first, and presumably the same to the second.

Isn't this just back to the heart of the old conspiracy theory that the aircraft failed to respond to the...
Forum: Tech Log
23rd Feb 2014, 16:56
Replies: 813
Views: 153,888
Posted By awblain

OG, I agree: I think we do agree. But, the...

OG, I agree: I think we do agree.

But, the manufacturer sets the flight control rules to seek the best and safest outcome in the operations they foresee.

Should there be a "I'm a test pilot,...
Forum: Tech Log
23rd Feb 2014, 08:53
Replies: 813
Views: 153,888
Posted By awblain

OG, OK, but in both cases, if the...

OG,

OK, but in both cases, if the alternative was a stall, avoided by the system, rather than a flying impact with the ground/trees, I'm not sure that would have been better. Almost everyone did...
Forum: Tech Log
22nd Feb 2014, 14:57
Replies: 813
Views: 153,888
Posted By awblain

The tweak to the flight control laws that damps...

The tweak to the flight control laws that damps the phugoid oscillation seems wholly irrelevant to the Habsheim situation. It's also seems irrelevant to Bilbao. A control input to ensure the smooth...
Forum: Tech Log
18th Feb 2014, 08:19
Replies: 813
Views: 153,888
Posted By awblain

Gums, I agree that 1g can't be right. ...

Gums,

I agree that 1g can't be right.

If the aircraft is accelerating, turning or slowing, then the seat-of-the-pants force will change in magnitude or direction from its value sitting on the...
Forum: Tech Log
18th Feb 2014, 08:06
Replies: 813
Views: 153,888
Posted By awblain

HN, Isn't the phugoid period of order...

HN,

Isn't the phugoid period of order 10-20s, and so near the ground, at close to maximum angle of attack, and with a big change in thrust, would it be perceptible in light of other changes?
...
Forum: Tech Log
16th Feb 2014, 17:51
Replies: 813
Views: 153,888
Posted By awblain

Gums, Are you thinking of having rather...

Gums,

Are you thinking of having rather more thrust to weight in hand to gain height?

I think you're right in general, you can use increased thrust to climb without changing speed, but perhaps...
Forum: Tech Log
16th Feb 2014, 09:56
Replies: 813
Views: 153,888
Posted By awblain

Thrust alone will do?

Yes, if you're flying a fighter, yes it will, although it might not be the fastest way to achieve the desired height gain.

With an A320 full of people, weighing something like 130,000lb and with...
Forum: Tech Log
28th Jan 2014, 06:25
Replies: 813
Views: 153,888
Posted By awblain

@DW, I fully agree about France: BEA matches...

@DW,

I fully agree about France: BEA matches the role of AAIB/NTSB.

In Italy though, the investigating magistrate seems to sometimes need to impound wreckage and potentially disrupt the...
Forum: Tech Log
27th Jan 2014, 21:23
Replies: 813
Views: 153,888
Posted By awblain

@DozyW I agree with you entirely on the...

@DozyW

I agree with you entirely on the criminalization of accidents.

The potential problem I see with the legal investigations into accidents in some places - Italy especially comes to mind -...
Forum: Tech Log
25th Jan 2014, 13:57
Replies: 813
Views: 153,888
Posted By awblain

That reduction to 56% certainly wasn't going to...

That reduction to 56% certainly wasn't going to help matters in front of the trees; it would also have set the computers an unusual - if not difficult - task, to hold the aircraft stable close to...
Forum: Tech Log
25th Jan 2014, 11:09
Replies: 813
Views: 153,888
Posted By awblain

The photos of the "wrong recorders" don't even...

The photos of the "wrong recorders" don't even look convincingly "wrong".

It really does show how ambitious doing FBW was at the start in the 1980s, when the recorder technology is compared.
Forum: Tech Log
6th Jan 2014, 20:23
Replies: 813
Views: 153,888
Posted By awblain

C'ture… surely at Habsheim there was no speed to...

C'ture… surely at Habsheim there was no speed to trade for height? And no power to allow a climb… The option to fly a Pugachev Cobra over the trees was not available.

Could a pair of A320 test...
Forum: Tech Log
21st Dec 2013, 15:54
Replies: 813
Views: 153,888
Posted By awblain

Skijump ramp shapes - very different to Habsheim

The skijump ramp isn't a flat plane with a sharp change of gradient at the bottom, as that would probably smash the nose wheel as it hit it.

The role of the ramp is simply to rotate the aircraft...
Forum: Tech Log
21st Dec 2013, 08:34
Replies: 813
Views: 153,888
Posted By awblain

Drag? Skijump?

Drag would increase. But only marginally.
They were descending and slowing gently with the existing settings, so that rate of slowing from drag would have increased, in addition to the slowing from...
Forum: Tech Log
20th Dec 2013, 12:57
Replies: 813
Views: 153,888
Posted By awblain

Re: rudderrat - exchange speed for height

You're right. They could have exchanged another 5kt (2.5m/s) of airspeed, from 110 to 105 (~55m/s). for height h (in m) ~ v.Delta-v/g ~ 55(2.5)/10 ~ 14m.

The key question is… did they have that...
Forum: Tech Log
15th Dec 2013, 20:19
Replies: 813
Views: 153,888
Posted By awblain

The trees being out of sight under the nose is...

The trees being out of sight under the nose is interesting, which might have contributed to a lack of urgency - although the approach of the line of the trees should have been perceptible in...
Forum: Tech Log
15th Dec 2013, 16:41
Replies: 813
Views: 153,888
Posted By awblain

If the angle of attack had been greater, and the...

If the angle of attack had been greater, and the slowing with the same power had thus been more alarming, then perhaps the power would have been added earlier, and the trees would have been avoided....
Forum: Tech Log
10th Dec 2013, 07:00
Replies: 813
Views: 153,888
Posted By awblain

2.5 degrees above alpha max?

I'm genuinely ignorant about the details of what the aircraft would deliver in different circumstances.

Did it deliver alpha that was 2.5 deg less than alpha max in order to avoid pushing too...
Showing results 1 to 20 of 20


 
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