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Search: Posts Made By: Owain Glyndwr
Showing results 1 to 35 of 45
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Forum: Tech Log
18th Apr 2014, 05:29
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

@HN39 I must say I admire your patience and...

@HN39

I must say I admire your patience and tolerance - and I wholly agree with your analysis!
Forum: Tech Log
10th Apr 2014, 07:12
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

@ OK465 I take your point, but I do wonder if...

@ OK465
I take your point, but I do wonder if we aren't being a little harsh when we judge a 1988 presentation by the standards of reproduction equipment available today.

The four "simulator"...
Forum: Tech Log
7th Apr 2014, 19:24
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

@roulis I have to say that I share DW's...

@roulis

I have to say that I share DW's puzzlement when trying to understand your point. From previous postings:
Forum: Tech Log
2nd Apr 2014, 07:42
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Looking at the totality of the evidence from the...

Looking at the totality of the evidence from the four graphics presented in the BEA report it seems to me that the situation is as follows:

The HAP mode of the EFCS has no knowledge of what the...
Forum: Tech Log
31st Mar 2014, 18:07
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

OK465 Excuse my jumping back a couple...

OK465



Excuse my jumping back a couple of posts, but what I was actually describing as interesting was, starting from 114 kt, the sequential increases in thrust, airspeed, pitch and height....
Forum: Tech Log
31st Mar 2014, 14:30
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

OK465 That's the way I read it. A quick sum...

OK465

That's the way I read it. A quick sum suggests that at 118kt (the end of the simulator run) 2 CFM56s at full chat would give a nose up pitch equivalent to about 10 deg up elevator.

For...
Forum: Tech Log
30th Mar 2014, 07:36
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

@OK465 Actually, if you have access to a...

@OK465

Actually, if you have access to a development simulator you wouldn't involve pilots at all; you would simply set up the initial conditions and feed in the actual control movements...
Forum: Tech Log
18th Mar 2014, 06:01
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Where I said OG out

Where I said



OG out
Forum: Tech Log
17th Mar 2014, 19:57
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

If you don't like if, change it to when. As...

If you don't like if, change it to when.

As for the rest, you are distorting my words to suit your own purposes. I made no mention of Valphamax, those are your words. I made no mention of flight...
Forum: Tech Log
17th Mar 2014, 12:50
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Yes because if you generate a situation where...

Yes because if you generate a situation where speed decays whilst in alphaprotect and trying to fly at alphamax you will not get to or remain at alphamax so your equalities break down.



So when...
Forum: Tech Log
17th Mar 2014, 06:35
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

You are wrong there. They know that to make a...

You are wrong there. They know that to make a correct demonstration of alphamax it is necessary to have enough thrust not only to maintain altitude but also to maintain speed. If that is not so the...
Forum: Tech Log
16th Mar 2014, 23:17
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

The short answer is no - or at least nothing...

The short answer is no - or at least nothing really convincing, just a couple of thoughts.

There may be two effects with opposing trends involved; the effect of height at more or less constant AOA...
Forum: Tech Log
16th Mar 2014, 22:45
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

An interesting interpretation of the laws of...

An interesting interpretation of the laws of aerodynamics; but I was taught that to maintain constant speed in level flight (constant altitude) thrust has to be set equal to drag and since drag...
Forum: Tech Log
16th Mar 2014, 08:07
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

HN39 There is also an unknown effect...

HN39



There is also an unknown effect coming from any difference between static pressure position errors established in free air (up to alphamax) and those which would apply at the same AOAs in...
Forum: Tech Log
16th Mar 2014, 05:52
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Let me first say that I strongly object to it...

Let me first say that I strongly object to it being suggested that I would present disinformation!
Now let me repeat what I have said previously - the AOA was held down by the phugoid damping term...
Forum: Tech Log
26th Feb 2014, 07:56
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

@Conf_iture If you want to so...

@Conf_iture



If you want to so speculate feel free....



It was of course poor judgement on the part of a pilot that produced the problem in the first place.
Forum: Tech Log
24th Feb 2014, 06:52
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Everything that is except time and space for the...

Everything that is except time and space for the system to do its job
Forum: Tech Log
24th Feb 2014, 06:47
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Originally posted by Con_fiture 5 ft gain -...

Originally posted by Con_fiture
5 ft gain - maybe; but it is a bit speculative isn't it? At a pitch attitude of 17 deg the elevator hinge and the lowest point of the gear are at the same height, so...
Forum: Tech Log
23rd Feb 2014, 16:24
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

@ Chris Scott I stand corrected :O So...

@ Chris Scott

I stand corrected :O

So that means that the recorded RA height was close to being the lowest point on the aircraft? Still well below tree height though
Forum: Tech Log
23rd Feb 2014, 10:26
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

awblain Don't get me wrong, we are on the...

awblain

Don't get me wrong, we are on the same wavelength. I am only pointing out a mechanism whereby the observed AOA restriction can be explained. Whether it made any difference is another...
Forum: Tech Log
23rd Feb 2014, 07:12
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

It's not really irrelevant to Habsheim because...

It's not really irrelevant to Habsheim because although the longer term effects of the 'tweak' could not affect the motion very much in the short time available the speed feedback that provides some...
Forum: Tech Log
22nd Feb 2014, 19:01
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Dear Roulis I would be very happy to work...

Dear Roulis

I would be very happy to work towards a better mutual understanding between engineers and pilots - I have been trying to do that all my working life.
But I have found that one...
Forum: Tech Log
22nd Feb 2014, 17:24
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Initial conditions are irrelevant - the system...

Initial conditions are irrelevant - the system must be stable for any initial condition and in any atmospheric conditions.

If you want confirmation that phugoid oscillations between two kinetic...
Forum: Tech Log
21st Feb 2014, 12:06
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Linktrained A fine distinction! As a...

Linktrained

A fine distinction!

As a non-pilot I would have said he was flying too low and left it too late. so I suppose my answer is "both".

The BEA report gives the average tree height as...
Forum: Tech Log
21st Feb 2014, 07:02
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Fizz, I didn't think Dozy and I were saying...

Fizz,

I didn't think Dozy and I were saying the same thing, because he was suggesting that the phugoid damping logic was changed and I am suggesting that it wasn't.
Nice to know that you agree...
Forum: Tech Log
21st Feb 2014, 05:25
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

True, but if you have read the Bilbao report you...

True, but if you have read the Bilbao report you will also have been aware that the modification was a deletion of the phase advanced AOA term that was part of the logic that triggered entry into the...
Forum: Tech Log
20th Feb 2014, 20:39
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

I am really unsure what point you are trying to...

I am really unsure what point you are trying to make here. AFAIK the same alphaprot law applies no matter what the atmospheric conditions.

Could you please explain what relevance the conditions...
Forum: Tech Log
19th Feb 2014, 13:14
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

@Confiture Well of course the elevator...

@Confiture

Well of course the elevator doesn't have an intention to deliver anything; it is merely the servant of the control laws. So far as those are concerned the behaviour is not really...
Forum: Tech Log
19th Feb 2014, 07:23
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

If I may throw in a few thoughts: The...

If I may throw in a few thoughts:

The natural phugoid period is approximately 0.23*Vkts TAS, that is about 28 seconds at 120 kts. If you are looking at a transition period of say 3 seconds that is...
Forum: Tech Log
23rd Jan 2014, 12:43
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

@Hn39 That makes sense. Those...

@Hn39



That makes sense. Those additional tests (with an increased alphamax so that it didn't interfere with the testing) would have come first to establish what alphamax might be and the...
Forum: Tech Log
21st Jan 2014, 15:39
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

Hi rrr Possibly, but it could be any number...

Hi rrr

Possibly, but it could be any number of reasons, and with absolutely zero knowledge of the VFW laws I would rather not speculate.

I would add though that the time history as shown is not...
Forum: Tech Log
13th Jan 2014, 18:57
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

No not at all.

No not at all.
Forum: Tech Log
12th Jan 2014, 18:20
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

A33zab Yes, thanks for that link and graph....

A33zab

Yes, thanks for that link and graph. I see that for quite a time the elevator was moving downwards and the AOA dropping even though the sidestick was being held fully back. Hmmmm!
Forum: Tech Log
7th Jan 2014, 19:06
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

rrr It is not unusual for the software...

rrr



It is not unusual for the software used on flight test airplanes to be more flexible than the production version. This is to allow gains etc to be tweaked easily for test purposes. So it...
Forum: Tech Log
4th Jan 2014, 11:35
Replies: 813
Views: 153,888
Posted By Owain Glyndwr

rrr OK, but in Conf 3 the zero lift AOA...

rrr

OK, but in Conf 3 the zero lift AOA Would be -6.5 deg

In earlier stall demonstrations Vsmin was taken as the minimum speed measured in the stall and stall recovery - this usually...
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