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Search: Posts Made By: MurphyWasRight
Showing results 1 to 23 of 23
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Forum: Tech Log
15th Jun 2011, 16:56
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Also common for higher frequency/critical nets...

Also common for higher frequency/critical nets was the use of twisted pair with one side wrapped to nearby ground pin. This worked fairly well up to 30Mhz or so.
I did manage to get a 66Mhz clock...
Forum: Tech Log
15th Jun 2011, 14:38
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

For those having a hard time beleiving a massive...

For those having a hard time beleiving a massive (true) speed drop from the climb consider a cart on a roller coaster going fast at the bottom of the first drop, as it reaches the top of the next...
Forum: Tech Log
11th Jun 2011, 12:45
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

DJ77: Well the stall warning -is-...

DJ77:


Well the stall warning -is- cancelled if the sensed speed goes below 60Kts and then comes back when > 60Kts so maybe not so obvious to the designers that cancelling an in progress stall...
Forum: Tech Log
8th Jun 2011, 19:13
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

R1: This bring up another data point...

R1:


This bring up another data point that would be of interest:

Over the full range of IAS and other factors taken into account to adjust raw AoA value what is the magnitude of the...
Forum: Tech Log
8th Jun 2011, 14:55
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

NoD: On the other hand there is a huge...

NoD:

On the other hand there is a huge difference between inhibiting initiating a stall warning at <60Kts and arbitrarily -stopping- an existing stall warning when the (sensed) speed goes from 60...
Forum: Tech Log
6th Jun 2011, 22:11
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

DW: What is the nature of the...

DW:


What is the nature of the artificial feel you mention?

If not to the sidestick then where?

Lack of back drive (what the other pilot is doing) is a seperate issue than tactile...
Forum: Tech Log
6th Jun 2011, 18:35
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Thanks for the chart, it shows that there is...

Thanks for the chart, it shows that there is feedback between sidestick position and force that is "local" but that does not provide tactile feedback to the pilot regarding the requested inputs...
Forum: Tech Log
6th Jun 2011, 17:24
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

May well be, any isolated design decision...

May well be, any isolated design decision considered without the full context can often appear sub-optimal.

I was just pointing out no matter if "right or wrong" (given full context) that the...
Forum: Tech Log
6th Jun 2011, 17:07
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

ChristiaanJ: The difference here is not...

ChristiaanJ:


The difference here is not between direct (cable to surface/C172) or artificially generated (input/airspedd/some function = force) feeedback but between tactile feedbback and NO...
Forum: Tech Log
6th Jun 2011, 15:10
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Confiture: No need for mechanicall movement to...

Confiture:
No need for mechanicall movement to keep PNF aware of the control inputs, a vector display would work well. Lenght and direction of vector (line from a central "0" dot) would show the...
Forum: Tech Log
2nd Jun 2011, 22:33
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Mr Optimistic: While true that pitch and...

Mr Optimistic:


While true that pitch and power would likely have worked something else -did- go wrong and the pilots ended up in a confusing situation.

At that poin a raw AoA indicator...
Forum: Tech Log
2nd Jun 2011, 19:47
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Before adding AoA crosscheck to the "pilots tool...

Before adding AoA crosscheck to the "pilots tool kit" it needs to be added to a display somewhere a pilot can access it.

Unless I misread something UAS blanks out the one "proxy" AoA display...
Forum: Tech Log
31st May 2011, 16:14
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

takata: Very interesting point, if the...

takata:


Very interesting point, if the PF was scanning the "gap" between MMO and speed more than absolute values he may well have perceived a jump in airspeed when ALTERNATe mode was entered...
Forum: Tech Log
31st May 2011, 13:38
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

mm43: Any system that pressents...

mm43:


Any system that pressents "conclusions" to a user without access to the underlying raw data is inherently problematic, especially if there are unknown interactions. (Unknown or untrained...
Forum: Tech Log
31st May 2011, 00:20
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Sensor validation: Th 60KT limit may also be...

Sensor validation:

Th 60KT limit may also be an almost arbitrary "safe" limit withe the rational that if airspeed is that low you are not flying anyway?
This would also help eliminate spurios...
Forum: Tech Log
30th May 2011, 19:26
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

JD-EE: The only "fact" is that the PNF...

JD-EE:


The only "fact" is that the PNF (recently asleep) was calling the Captain, whether he was seriously unhappy or just following protocol for any unusual situation is not mentioned in the...
Forum: Tech Log
30th May 2011, 18:02
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

JD-EE: The relief pilot was asleep for a...

JD-EE:


The relief pilot was asleep for a couple of hours not the PIC. The point being that the relief pilot (PNF)) may have been slow to recognize the stall.

BTW: The relief pilot was...
Forum: Tech Log
30th May 2011, 15:12
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Sensor_validation: I totally agree that...

Sensor_validation:


I totally agree that the BEA "note" has more information than may appear if simply read as a document.

The BEA probably has a very good idea of the facts -and- causes of...
Forum: Tech Log
27th May 2011, 21:11
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

CapCafre: A simple question for Airbus...

CapCafre:


A simple question for Airbus pilots:

Until today were you aware that the stall warning could go away if a stall developed to the point that indicated airspeed dropped below 60KT?...
Forum: Tech Log
27th May 2011, 19:02
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Sapgiola: BEA states that the stall...

Sapgiola:


BEA states that the stall warning system AOA sensor is considered invalid below 60KT.

When stall warning sounds there are 2 actions that can cause the warning to stop:

A: Nose...
Forum: Tech Log
27th May 2011, 17:42
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

LW50: Interesting point, could the...

LW50:


Interesting point, could the pilots have been -that- disoriented?
(I have no knowledge/opinion either way.)

If I parsed the narrative correctly (would much rather look at the DFR...
Forum: Tech Log
27th May 2011, 17:28
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

Extraction of actions from narrative

An attempt at extracting a logical flow from the narrative. Ellipses (...)
indicate portions I removed for clarity, items such as inline explanations,times and displayed speeds. <comment> are my...
Forum: Tech Log
27th May 2011, 14:27
Replies: 2,070
Views: 615,850
Posted By MurphyWasRight

spagiola comments: Agree that the...

spagiola comments:



Agree that the report is very light on some details but that does bring up a question in my (obviously not heavy pilot) mind:

Given the lack of feedback/coupling...
Showing results 1 to 23 of 23


 
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