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Search: Posts Made By: HazelNuts39
Showing results 1 to 35 of 108
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Forum: Tech Log
22nd Apr 2014, 14:27
Replies: 813
Views: 153,888
Posted By HazelNuts39

Indeed ...

Indeed ...
Forum: Tech Log
21st Apr 2014, 14:40
Replies: 813
Views: 153,888
Posted By HazelNuts39

So how would you demonstrate it in normal law in...

So how would you demonstrate it in normal law in a certification flight test?

P.S.

The diagram you posted is a schematic illustration that alpha-max is just shy of alpha-CLmax. Alpha-CLmax...
Forum: Tech Log
21st Apr 2014, 06:48
Replies: 813
Views: 153,888
Posted By HazelNuts39

How does that differ from the definition of Vs1g?...

How does that differ from the definition of Vs1g?

P.S.

The special conditions for certification of the A320 (and associated guidance material) define Vs1g as the minimum speed (corrected to 1g...
Forum: Tech Log
17th Apr 2014, 18:44
Replies: 813
Views: 153,888
Posted By HazelNuts39

5. None of them But you are constantly...

5. None of them

But you are constantly changing the subject. The issue was Valphamax, where you disagreed with me, and you have not answered my question: How would you define Valphamax?

P.S.
...
Forum: Tech Log
16th Apr 2014, 13:55
Replies: 813
Views: 153,888
Posted By HazelNuts39

Short summary of the captains briefing of the...

Short summary of the captains briefing of the copilot: I'll take her to alphamax and then you control thrust to maintain zero vertical speed ...
Forum: Tech Log
15th Apr 2014, 08:45
Replies: 813
Views: 153,888
Posted By HazelNuts39

It seems reasonable to me that the BEA saw no...

It seems reasonable to me that the BEA saw no need to communicate them because neither pilot made any reference to those speeds, not in the briefing nor in the execution of the demonstration. That in...
Forum: Tech Log
14th Apr 2014, 10:06
Replies: 813
Views: 153,888
Posted By HazelNuts39

Compared to the certification requirement, that...

Compared to the certification requirement, that is a lame argument. Vs1g is the official definition of "stalling speed" for this airplane, and it is obtained with the sidestick on the aft stop at the...
Forum: Tech Log
13th Apr 2014, 08:38
Replies: 813
Views: 153,888
Posted By HazelNuts39

Firstly, speed and attitude are independent...

Firstly, speed and attitude are independent variables. You can have any speed at any attitude.

Secondly, one of many explanations is that Asseline flew into a forest and Bechet did not. Asseline's...
Forum: Tech Log
9th Apr 2014, 20:02
Replies: 813
Views: 153,888
Posted By HazelNuts39

If I understood Confiture correctly, he was...

If I understood Confiture correctly, he was criticising the report, not the lack of cockpit AoA indication. Considering that the cockpit display includes Valphaprot and Valphamax, which speed would...
Forum: Tech Log
9th Apr 2014, 16:23
Replies: 813
Views: 153,888
Posted By HazelNuts39

This has been discussed extensively earlier in...

This has been discussed extensively earlier in the thread. The Special Conditions for certification of the A320 (published by the FAA and linked earlier on this thread) define Vs1g as Valphamax. The...
Forum: Tech Log
8th Apr 2014, 09:21
Replies: 813
Views: 153,888
Posted By HazelNuts39

Sorry, I should perhaps have written "phugoid...

Sorry, I should perhaps have written "phugoid motion at approximately alphamax". The phugoid damping terms will reduce the AoA slightly below alphamax when the airplane is decelerating, and increase...
Forum: Tech Log
7th Apr 2014, 10:14
Replies: 813
Views: 153,888
Posted By HazelNuts39

Indeed, as shown below. No. The airplane will...

Indeed, as shown below.
No. The airplane will start a phugoid motion at alphamax as shown earlier, unless the pilot relaxes the sidestick and maintains the appropriate pitch attitude.

In the...
Forum: Tech Log
6th Apr 2014, 22:50
Replies: 813
Views: 153,888
Posted By HazelNuts39

The report discusses the difficulty of...

The report discusses the difficulty of reproducing simultaneously all elements of the accident flight. My understanding of "Recoupement" is that the objective of Bechet's simulator exercise was to...
Forum: Tech Log
5th Apr 2014, 15:57
Replies: 813
Views: 153,888
Posted By HazelNuts39

On the timescale of the chart on page 9 of BEA's...

On the timescale of the chart on page 9 of BEA's 'Additif' (synchronized at the time the flight path passes through 100 ft RA ?), Bechet advanced the thrustlevers between 1 and 1.5 seconds earlier...
Forum: Tech Log
31st Mar 2014, 18:49
Replies: 813
Views: 153,888
Posted By HazelNuts39

That is a strange twist - many posts ago I first...

That is a strange twist - many posts ago I first suggested that phugoid damping was a possible explanation for the 'attenuated' response of the airplane to full back sidestick.
Forum: Tech Log
31st Mar 2014, 15:10
Replies: 813
Views: 153,888
Posted By HazelNuts39

"Not my point"? IIRC you made it a point. ...

"Not my point"? IIRC you made it a point.

Bechet pulls the sidestick abruptly fully back at an AoA where the FCS is in pitch command mode and there is no phugoid damping. Therefore the airplane...
Forum: Tech Log
31st Mar 2014, 14:40
Replies: 813
Views: 153,888
Posted By HazelNuts39

For the A330 in clean configuration alphamax...

For the A330 in clean configuration alphamax (normal law) is greater than alpha_SW (alternate law) at all Mach numbers less than 0.86. I do not know the value of alphaCLmax, except that it is greater...
Forum: Tech Log
31st Mar 2014, 07:52
Replies: 813
Views: 153,888
Posted By HazelNuts39

Firstly, both the Bilbao report and the Hudson...

Firstly, both the Bilbao report and the Hudson river report mention phugoid dammping explicitly for the high angle of attack protection mode. If you have a reference stating that it is a feature of...
Forum: Tech Log
25th Mar 2014, 09:26
Replies: 813
Views: 153,888
Posted By HazelNuts39

Capn Bloggs in another thread...

Capn Bloggs in another thread (http://www.pprune.org/tech-log/536616-thrust-during-flare-q-airbus-test-pilots.html#post8399672):
Fits well into our thread indeed.
Forum: Tech Log
23rd Mar 2014, 06:51
Replies: 813
Views: 153,888
Posted By HazelNuts39

Confiture, There is no discussion of...

Confiture,

There is no discussion of alpha-protection phugoid damping in the BEA report, it doesn't go into that level of detail. Many more details have been discussed in later reports of BEA and...
Forum: Tech Log
22nd Mar 2014, 22:42
Replies: 813
Views: 153,888
Posted By HazelNuts39

Confiture, In my post #605...

Confiture,

In my post #605 (http://www.pprune.org/tech-log/528034-habsheim-31.html#post8355502) I noted the difference between Bechet's simulation and the accident flight. Bechet went to full side...
Forum: Tech Log
19th Mar 2014, 21:30
Replies: 813
Views: 153,888
Posted By HazelNuts39

The point is that it has to increase first before...

The point is that it has to increase first before it decreases.

To achieve a FPA of 10 degrees at 115 kTAS takes roughly:

10 seconds at one tenth of a gee
5 seconds at two tenths of a gee
3...
Forum: Tech Log
19th Mar 2014, 19:27
Replies: 813
Views: 153,888
Posted By HazelNuts39

OK465, I don't disagree with what you are...

OK465,

I don't disagree with what you are writing, but it does not change the physical law that increasing the V/S requires a vertical force that exceeds the weight of the airplane.

Secondly,...
Forum: Tech Log
19th Mar 2014, 17:55
Replies: 813
Views: 153,888
Posted By HazelNuts39

Agreed, I don't remember how many times I wrote...

Agreed, I don't remember how many times I wrote that. It is the reason that the lift is proportional to airspeed-squared. Lift can only increase by increasing the airspeed.
That is basically correct...
Forum: Tech Log
19th Mar 2014, 07:09
Replies: 813
Views: 153,888
Posted By HazelNuts39

If they do, they control speed by using the...

If they do, they control speed by using the elevator to change pitch and AoA.
Forum: Tech Log
18th Mar 2014, 17:31
Replies: 813
Views: 153,888
Posted By HazelNuts39

It is when the AoA is constant. It is in...

It is when the AoA is constant.
It is in alpha-protect mode because the FCS commands the elevator to maintain the AoA commanded by the sidestick position (leaving aside the phugoid damping terms,...
Forum: Tech Log
18th Mar 2014, 13:34
Replies: 813
Views: 153,888
Posted By HazelNuts39

I'm disappointed that you still don't seem to...

I'm disappointed that you still don't seem to grasp a point I made more than once (see f.e. my post #520 on page 26):

When flying at alphamax, thrust controls altitude through speed:

Increase...
Forum: Tech Log
17th Mar 2014, 08:49
Replies: 813
Views: 153,888
Posted By HazelNuts39

It depends. If you do the demonstration at low...

It depends. If you do the demonstration at low altitude you have to set the thrust that maintains level flight.

If you do the demonstration in free air there is no need to maintain altitude, but...
Forum: Tech Log
16th Mar 2014, 22:58
Replies: 813
Views: 153,888
Posted By HazelNuts39

I was under the expression that you had accepted...

I was under the expression that you had accepted the explanation I offered in post#605:


There was also a difference in the way the sidestick was pulled back - Bechet in one quick move and...
Forum: Tech Log
16th Mar 2014, 11:38
Replies: 813
Views: 153,888
Posted By HazelNuts39

Owain Glyndwr, I agree with that. The last...

Owain Glyndwr,

I agree with that. The last five seconds seem to indicate a change of PEC as the airplane gets nearer to the ground at increasing AoA.

However, in the preceding 20 seconds we...
Forum: Tech Log
15th Mar 2014, 21:55
Replies: 813
Views: 153,888
Posted By HazelNuts39

The DFDR recording offers three sets of data that...

The DFDR recording offers three sets of data that can be used to reconstruct the trajectory:

-- radio altitude
-- pressure altitude
-- x, y, and z accelerations

When comparing these three...
Forum: Tech Log
13th Mar 2014, 08:26
Replies: 813
Views: 153,888
Posted By HazelNuts39

That is not what I said in post #622 based on the...

That is not what I said in post #622 based on the graph in the report. In the simulation the airplane gained 10 ft and that is equivalent to 1 kt of airspeed.The graph is a computer/plotter generated...
Forum: Tech Log
12th Mar 2014, 21:17
Replies: 813
Views: 153,888
Posted By HazelNuts39

The reports states that the wind was 5kt at the...

The reports states that the wind was 5kt at the time of the accident. Comparison of the recorded airspeed and groundspeed shows variations of +/- 2kt of airspeed that can only be explained by...
Forum: Tech Log
9th Mar 2014, 22:39
Replies: 813
Views: 153,888
Posted By HazelNuts39

I see no reason to doubt the accuracy of the...

I see no reason to doubt the accuracy of the simulator used by Bechet. He gained less than 10ft height in the five seconds after he went to full throttle and full back stick. That is equivalent to...
Forum: Tech Log
6th Mar 2014, 22:32
Replies: 813
Views: 153,888
Posted By HazelNuts39

IMHO, since you want to 'get your facts in a...

IMHO, since you want to 'get your facts in a row', that doesn't refer to Bechet, who was president of the Commission of Inquiry.
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