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Search: Posts Made By: Owain Glyndwr
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Forum: Tech Log
22nd Jan 2019, 09:14
Replies: 9
Views: 1,693
Posted By Owain Glyndwr

DFDR readout

underfire - Then I am left wondering whether there is a difference between NTSB and BEA practice. In the AF447 final report it is specifically stated that positive pedal position is left and positive...
Forum: Tech Log
21st Jan 2019, 17:45
Replies: 9
Views: 1,693
Posted By Owain Glyndwr

DFDR readout

As underfire says, clockwise is positive and counterclockwise negative, but you need to connect that with direction of view.
Normally this follows the right hand rule - hold out your right hand with...
Forum: Tech Log
24th May 2018, 07:20
Replies: 14
Views: 1,488
Posted By Owain Glyndwr

These are the CS25 requirements which define...

These are the CS25 requirements which define Vd/Md

(b) Design dive speed, VD. VD must be selected so that VC/MC is not greater than 08 VD/MD, or so that the minimum speed margin between VC/MC and...
Forum: Tech Log
21st May 2018, 07:42
Replies: 15
Views: 3,106
Posted By Owain Glyndwr

Agree with those sentiments. Flap loads (on all...

Agree with those sentiments. Flap loads (on all parts) will increase as square of speed with a small correction for the effect of the aoa reduction that goes with the extra speed.
There isn't much...
Forum: Tech Log
3rd Mar 2018, 08:38
Replies: 7
Views: 2,977
Posted By Owain Glyndwr

Thanks for the invite PA, but I don't think I...

Thanks for the invite PA, but I don't think I have much to say that isn't already well described and illustrated in Aerodynamics for Naval Aviators (fig. 3.9 about p. 220)

Only thing I might add...
Forum: Tech Log
9th Nov 2017, 08:27
Replies: 35
Views: 7,340
Posted By Owain Glyndwr

MZFW is a structural limit, nothing to do with...

MZFW is a structural limit, nothing to do with performance or handling. The wing design load for many aircraft is a 2.5g manoevre at MTOW and fwd CG. The wing has to carry this load but the inertia...
Forum: Tech Log
26th Oct 2017, 10:35
Replies: 48
Views: 7,787
Posted By Owain Glyndwr

It is pretty clear from the article being...

It is pretty clear from the article being criticised that the weight gains quoted are their estimate of the savings in their estimate of the skin weight based on their understanding of the static...
26th Aug 2017, 15:28
Replies: 27
Views: 4,249
Posted By Owain Glyndwr

Neither did I say it did, merely that the gear...

Neither did I say it did, merely that the gear collapsed, but in his post#5 PEI said he was looking for accident/incident reports, and if you are trying to build up a total picture then near misses...
24th Aug 2017, 17:01
Replies: 27
Views: 4,249
Posted By Owain Glyndwr

@ PEI I can repeat the Boeing data with no...

@ PEI

I can repeat the Boeing data with no problem as I have the reports stored. Sorry, the URL addresses were googled “on the fly”, and I don’t have the motivation to do it again. You should have...
24th Aug 2017, 11:55
Replies: 27
Views: 4,249
Posted By Owain Glyndwr

OK it seems to have been confusing, so I have...

OK it seems to have been confusing, so I have deleted the post . I was only trying to help!
24th Aug 2017, 08:51
Replies: 27
Views: 4,249
Posted By Owain Glyndwr

Is this what you are looking for? 3-Jan-08...

Is this what you are looking for?

3-Jan-08 Atlas Blue 737-400 Deauville, France Landing BEA Rapport cn-x080103

15-Jan-08 Air France A300-600 Paris, France Landing BEA tf-w080115
...
Forum: Tech Log
11th Aug 2017, 09:45
Replies: 1,646
Views: 389,594
Posted By Owain Glyndwr

@OK465 I agree with you! At our age carping...

@OK465

I agree with you! At our age carping can be a waste of valuable time :-)
I was surprised by your remark on the effect of airspeed decay rate on deterrent buffet level. I think I have read...
Forum: Tech Log
10th Aug 2017, 09:22
Replies: 1,646
Views: 389,594
Posted By Owain Glyndwr

There appears to be some misunderstanding of the...

There appears to be some misunderstanding of the character of high altitude/high Mach No stalls on current transport aircraft. On designs using supercritical wing sections on which upper surface flow...
Forum: Tech Log
25th Jul 2017, 15:11
Replies: 35
Views: 21,439
Posted By Owain Glyndwr

John, You said you had never seen any...

John,

You said you had never seen any authoritative reference to bank. You will find one in Appendix G of Torenbeek's "Synthesis of Subsonic Airplane Design" where he writes:

>It is generally...
Forum: Tech Log
27th Jun 2017, 13:56
Replies: 21
Views: 6,546
Posted By Owain Glyndwr

Gundernak, Sorry, but you have it completely...

Gundernak,

Sorry, but you have it completely wrong. It is UPWASH not downwash that makes the change, which is not "massive" - probably about 4 or 5 degrees at full flap; and if you introduce a...
Forum: Tech Log
23rd Jun 2017, 12:02
Replies: 21
Views: 6,546
Posted By Owain Glyndwr

@Gundernak, Introducing pitch tends to...

@Gundernak,

Introducing pitch tends to confuse the issue. Pitch is the sum of AOA and flight path angle. Stall depends ONLY on AOA and it is better to confine discussion to that parameter .
You...
Forum: Tech Log
23rd Jun 2017, 06:24
Replies: 21
Views: 6,546
Posted By Owain Glyndwr

@ Gundernak AOA is usually defined as the...

@ Gundernak
AOA is usually defined as the angle between the upstream freestream velocity and a fixed airframe reference axis. Since wings are often twisted across the span and this twist varies...
Forum: Tech Log
8th Jun 2017, 05:14
Replies: 1,646
Views: 389,594
Posted By Owain Glyndwr

@tdracer You have a slight advantage over me in...

@tdracer
You have a slight advantage over me in that I only spent 37 years on the design side, but I would have been laughing along with you. With the caveat that it was allowing the aoa to develop...
Forum: Tech Log
31st May 2017, 13:18
Replies: 35
Views: 7,171
Posted By Owain Glyndwr

Yes, I understand that removing the furnishings...

Yes, I understand that removing the furnishings could move the empty CG forward, but why would that be a problem?
Forum: Tech Log
31st May 2017, 11:20
Replies: 35
Views: 7,171
Posted By Owain Glyndwr

When I googled A320 P2F I found the following...

When I googled A320 P2F I found the following extract from "Air Cargo World":

>The technical challenge for EFW was resolving the issue of where to put the cargo door without aggravating the A320’s...
Forum: Tech Log
25th May 2017, 10:16
Replies: 126
Views: 24,959
Posted By Owain Glyndwr

Maybe we do need a sidestick shaker? ...

Maybe we do need a sidestick shaker?

Actually, I think that would be a good idea!
Forum: Tech Log
25th May 2017, 04:47
Replies: 126
Views: 24,959
Posted By Owain Glyndwr

@Quagmire You will note that I have removed...

@Quagmire

You will note that I have removed the post that offended you, but I would say that the private comments I received were supportive.
At various times in your campaign you invited...
Forum: Tech Log
24th May 2017, 20:49
Replies: 126
Views: 24,959
Posted By Owain Glyndwr

@T29B OK, accepted,, I have deleted the...

@T29B
OK, accepted,, I have deleted the offending post
Forum: Tech Log
24th May 2017, 08:03
Replies: 126
Views: 24,959
Posted By Owain Glyndwr

@Quagmire There are many points in your...

@Quagmire

There are many points in your postings with which I disagree, but here are just a few:
As a general point, making fundamental system changes on the basis of a single scenario is poor...
Forum: Tech Log
29th Mar 2017, 09:15
Replies: 26
Views: 18,655
Posted By Owain Glyndwr

scifi Dave Reid is perfectly correct, "Air...

scifi
Dave Reid is perfectly correct, "Air speed" without an adjective is meaningless.
Technically, a pitot static system measures a quantity known as Equivalent Airspeed which is the airspeed...
Showing results 1 to 25 of 463
 


 
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