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Search: Posts Made By: Owain Glyndwr
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Forum: Tech Log
25th Mar 2013, 08:40
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

Franzl I agree that it was mostly well...

Franzl



I agree that it was mostly well known facts, but although I count myself "a practitioner skilled in the art"(of aerodynamics) I still learned some new things about how stall testing is...
Forum: Tech Log
24th Mar 2013, 17:16
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

Franzl, Your post leaves me wondering .........

Franzl,

Your post leaves me wondering ...... I heard four flight test professionals describing how they go about a delicate task that must be approached carefully. They were talking to the Flight...
Forum: Tech Log
7th Mar 2013, 19:46
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

Most people think of aircraft stability as being...

Most people think of aircraft stability as being the behaviour of the machine left to itself, not gyrations produced by random pilot inputs. The fact that the flight path varied has nothing to do...
Forum: Tech Log
7th Mar 2013, 18:54
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

Nil. There is no such animal. The phugoid is an...

Nil. There is no such animal. The phugoid is an oscillation in airspeed and altitude at more or less constant AoA. If the control system maintains a constant flight path then the conditions for a...
Forum: Tech Log
29th Oct 2012, 08:38
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

The final BEA report on Habsheim says: In...

The final BEA report on Habsheim says:


In section 1.1 Déroulment du vol,



And again in section 1.11.3. Restitution des conversation et des alarmes sonores (CVR)
Forum: Tech Log
2nd Sep 2012, 15:32
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

Hi OK465 Let's see if we can put together...

Hi OK465

Let's see if we can put together some sort of explanation that will reconcile what we have.

Bearing in mind that your original question related to full ND in a developed stall.

If...
Forum: Tech Log
2nd Sep 2012, 09:13
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

@OK465 Boy, do I agree with that one! ...

@OK465

Boy, do I agree with that one!


Va at FL350 and 205t would be about 260 kts CAS. By definition the aircraft would stall at 2.5g at that speed. On my sums the elevator needed in...
Forum: Tech Log
1st Sep 2012, 20:55
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

@OK465 No, I think it is I who may have it...

@OK465

No, I think it is I who may have it wrong :ouch:
I see what you are getting at now. I had been assuming that only the C* gains defaulted to their 330 kt values, but from what you describe...
Forum: Tech Log
1st Sep 2012, 18:41
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

@OK 465 Yes Sorry, I don't...

@OK 465



Yes



Sorry, I don't recognise what you mean by 'SD'
Forum: Tech Log
1st Sep 2012, 17:27
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

@OK 465 Sure - why not? The gains, as...

@OK 465



Sure - why not? The gains, as I tried to explain, relate to the transient response characteristics; that is to say to the first 3 or 4 seconds of any manoeuvre. If the elevator...
Forum: Tech Log
31st Aug 2012, 18:18
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

PJ2 I'm entirely with HN39 on this one....

PJ2


I'm entirely with HN39 on this one. Presumably your instructor was suggesting that since gravity is very slightly less the effective "weight" would be less leading to a slightly lower lift...
Forum: Tech Log
31st Aug 2012, 07:36
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

@HN39 Yes of course - any gee puts the...

@HN39



Yes of course - any gee puts the CL and Cd up and makes deceleration more rapid.
Forum: Tech Log
31st Aug 2012, 06:47
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

OK, A330 has a strapdown sensor so we are talking...

OK, A330 has a strapdown sensor so we are talking same language



That is an important difference, but I don't see how that implies that the 'bus commands an attitude. I see the pitch...
Forum: Tech Log
31st Aug 2012, 03:00
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

Hi gums, That is just my point! The...

Hi gums,



That is just my point! The system tries to achieve one gee. The pitch attitude input to the system is only to account for the fact that in 1g level flight the accelerometer doesn't...
Forum: Tech Log
30th Aug 2012, 21:37
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

@ gums Gums. maybe it is just me, but...

@ gums



Gums. maybe it is just me, but when you write this I keep on thinking that you are inferring that the aircraft is not actually flown to 1g.

If you consider the whole range of genuine...
Forum: Tech Log
30th Aug 2012, 21:25
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

@OK465 I'm not sure if I can explain it...

@OK465

I'm not sure if I can explain it easily, but essentially what I am saying is that the time to achieve the desired level of steady state 'g' will not be radically different whether the C*...
Forum: Tech Log
29th Aug 2012, 16:46
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

@Retired F4 I'm entirely with you...

@Retired F4



I'm entirely with you regarding the relative changes in lateral and pitch control, although I believe the change from S/S demanding roll acceleration instead of roll rate to have...
Forum: Tech Log
29th Aug 2012, 07:57
Replies: 1,064
Views: 186,649
Posted By Owain Glyndwr

As I understand the system it doesn't work quite...

As I understand the system it doesn't work quite like this. The BEA report says:



From all the diagrams I have seen describing how C* works the pitch rate/g mix is a feedback term. S/S movement...
Showing results 1 to 18 of 18


 
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