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Search: Posts Made By: Owain Glyndwr
Showing results 1 to 34 of 34
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Forum: Tech Log
1st Jul 2012, 05:21
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

That inner SAS loop is just an old fashioned...

That inner SAS loop is just an old fashioned pitch damper.
Forum: Tech Log
30th Jun 2012, 07:33
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Hi HN39 I think TurbineD has it right....

Hi HN39



I think TurbineD has it right. Surely the whole point of the C* law is that there is no direct relationship between sidestick and elevator deflections? (and therefore no correlation of...
Forum: Tech Log
18th Jun 2012, 14:56
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

What HN39 has described is standard aerodynamic...

What HN39 has described is standard aerodynamic convention - TE down on the elevator (or THS) is a positive deflection. It would be understood by aerodynamicists anywhere in the world except Grassy...
Forum: Tech Log
25th May 2012, 21:25
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

I take it you don't mean us to take reciprocal...

I take it you don't mean us to take reciprocal literally? Complementary perhaps?

Again, not quite - normal acceleration is just as important

There I don't agree - adopting a default value for...
Forum: Tech Log
25th May 2012, 19:25
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Well I wouldn't be so sure of that - such a...

Well I wouldn't be so sure of that - such a relationship is fundamental airmanship I think.

But anyway, I think you have it a bit wrong - one doesn't calculate AoA from CL but CL from AoA. CL...
Forum: Tech Log
25th May 2012, 16:20
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Dozy, I am usually with you, at least in...

Dozy,

I am usually with you, at least in spirit, in your tussle with Confiture, but I really don't think you need to instruct him on what constitutes a stall :=

It might not be so bad if it...
Forum: Tech Log
20th May 2012, 07:25
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Lyman Well they were at least 250 kts...

Lyman



Well they were at least 250 kts too slow to get any sort of aeroelastic reversal and the sidelip/control deflections never got into the non-linear range let alone stall, and even stall...
Forum: Tech Log
19th May 2012, 07:19
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Sticking my neck out, but this is why I think...

Sticking my neck out, but this is why I think that when he said that he was almost entirely correct.

1. With the wing completely stalled, the ailerons would have been useless - no roll control,...
Forum: Tech Log
15th May 2012, 18:27
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Wasn't that the time he throttled back to idle?...

Wasn't that the time he throttled back to idle? (not shown on HN39's graph)
Forum: Tech Log
15th May 2012, 18:18
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

I'd say that he held it up there deliberately,...

I'd say that he held it up there deliberately, but that's only nitpicking :D

I don't want to spoil the fun, but Clandestino was right when he cautioned against applying 'normal' rules to the...
Forum: Tech Log
15th May 2012, 15:24
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Lyman I think you've got it about face...

Lyman



I think you've got it about face again - +ve sidestick is ND - he's lingering in NU.
Check the DFDR traces for SS sign convention
Forum: Tech Log
9th May 2012, 08:28
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

BUSS/AoA To be strictly accurate the...

BUSS/AoA



To be strictly accurate the actual AoA doesn't need to be compensated for Mach, but if you mean that the surrounding limits are no better than you had on your F4 then yes, I think...
Forum: Tech Log
8th May 2012, 17:58
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Retired F4 I was not unaware that the...

Retired F4

I was not unaware that the numbers were type specific. My point was simply that an AoA instrument for airline use would have to be more sophisticated than that on your F4 and that it...
Forum: Tech Log
8th May 2012, 13:52
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

F4 AoA indication

Retired F4





OK, since I posted my query I’ve found an example of an F4 operational manual on the ‘net.
Short answer is that it wasn’t done with any precision.
The AoA probe...
Forum: Tech Log
8th May 2012, 10:45
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Retired F4 OK, I see how an AoA gauge works...

Retired F4

OK, I see how an AoA gauge works - it doesn't need any calibration to tell you what the AoA is; it's not until you want it to tell you how close you are to stall that calibration comes...
Forum: Tech Log
7th May 2012, 11:00
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

RAeS conference

Here is Part B
Forum: Tech Log
7th May 2012, 10:57
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

RAeS conference

This will be too long for a single post, but I think some of the comments will resonate with some contributors ...

Part A
Forum: Tech Log
29th Apr 2012, 21:50
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Machinbird Sorry, I don't have any...

Machinbird



Sorry, I don't have any inside information, but I do have a downloaded copy of an A330 FCOM which states that for Yaw control in Alternate 2:

Dutch roll damping is provided with...
Forum: Tech Log
29th Apr 2012, 11:31
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

The answer to that I think is that there isn't...

The answer to that I think is that there isn't any Ny accelerometer input to the YD calculation when Alt2 is operative. So as as I know, the sole short term input to the YD in this state is rate of...
Forum: Tech Log
29th Apr 2012, 06:56
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

I really don't see the problem here. Ny is...

I really don't see the problem here.

Ny is computed from an accelerometer mounted near the top of the rear bulkhead.
If it is to be used to estimate sideslip then the reading needs to be...
Forum: Tech Log
28th Apr 2012, 21:08
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Hazelnuts, AF33Zab' posting answers your...

Hazelnuts,

AF33Zab' posting answers your question I think.
They would need dynamic pressure (Vc) and Mach to calculate the rudder deflection correction, so if either of these go NCD the estimated...
Forum: Tech Log
28th Apr 2012, 07:03
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

http://i1081.photobucket.com/albums/j351/OwainGlyn...

http://i1081.photobucket.com/albums/j351/OwainGlyndwr/Pinskeronlaterals.jpg

Dozy


Since the aileron effectiveness is just about zero in fully stalled conditions this has got to be true.;)
But...
Forum: Tech Log
27th Apr 2012, 21:30
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

http://i1081.photobucket.com/albums/j351/OwainGlyn...

http://i1081.photobucket.com/albums/j351/OwainGlyndwr/NASAupsetresults.jpg

MM43,

Sorry, I have to disagree with you on fin and rudder remaining effective at high AoA. In fact the increased...
Forum: Tech Log
26th Apr 2012, 07:26
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Dozy, If he was fighting an overspeed, why...

Dozy,

If he was fighting an overspeed, why would he select TOGA?
Forum: Tech Log
26th Apr 2012, 06:52
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

OK465 Not meant to imply anything more than...

OK465

Not meant to imply anything more than that the simulator aerodynamic model would have been validated up to the stall but not beyond and that (for us) the simulator modelling beyond that is...
Forum: Tech Log
26th Apr 2012, 06:48
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

bubbers44 I'm not trying to - as I...

bubbers44



I'm not trying to - as I said I leave that to others who know more about it. Doesn't stop me having an opinion though!
Forum: Tech Log
26th Apr 2012, 06:45
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Dozy There is a big difference between an...

Dozy

There is a big difference between an uncontrollable nose down pitch when the aircraft stalls in the classic manner and the need to hold back stick in ever increasing amounts as AoA is...
Forum: Tech Log
25th Apr 2012, 19:19
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Lyman Yes, you are missing something. I...

Lyman


Yes, you are missing something. I gave a description of stall on modern airliners is Post #294 of Thread 5.
Franzl


Yeah I agree the lateral behaviour complicates matters. A lot...
Forum: Tech Log
25th Apr 2012, 18:04
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

IIRC, as looking at the traces will tell you, at...

IIRC, as looking at the traces will tell you, at 02:12:45 they were at 10 deg nose down with full up elevator and flight idle power. The aircraft, as I have said before, has no natural nosedown pitch...
Forum: Tech Log
25th Apr 2012, 17:44
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

If you have read my previous posts you will be...

If you have read my previous posts you will be aware that I avoid any comment on what pilots might or might not have done - I leave that to more qualified observers.

The DFDR is not intended for...
Forum: Tech Log
25th Apr 2012, 17:09
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Franzl, Good questions that deserve a...

Franzl,

Good questions that deserve a reasoned reply. Sorry to have got out of sequence, but domestic duties got in the way.

I assume we are not doubting that stuffing the nose down will...
Forum: Tech Log
19th Apr 2012, 20:58
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

OK465 No, it's a senior moment. I picked up...

OK465

No, it's a senior moment. I picked up the wrong values from the spreadsheet. The Mach lines shown are EAS not CAS. doesn't change the other numbers though which are all CAS - these Mach...
Forum: Tech Log
19th Apr 2012, 16:00
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Machinbird None - it is just a performance...

Machinbird

None - it is just a performance calculation in which the crew is assumed to apply pitch at a given rate until the desired steady ND value is achieved, and then to fly constant pitch...
Forum: Tech Log
19th Apr 2012, 09:47
Replies: 1,550
Views: 302,436
Posted By Owain Glyndwr

Recovery trajectories

I'm sympathetic to Dozy's pov that missing new data the subject has been done to death, but we need not expect to see any new factual data ex BEA since their "cartoons" already give much more...
Showing results 1 to 34 of 34


 
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