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Search: Posts Made By: ecto1
Showing results 1 to 35 of 47
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Forum: Rumours & News
13th Apr 2019, 12:40
Replies: 146
Views: 104,502
Posted By ecto1

By the way, that report previously posted: ...

By the way, that report previously posted:

https://www.ucsusa.org/sites/default/files/attach/2015/11/Cleaner-Cars-from-Cradle-to-Grave-full-report.pdf

Is flagrantly ignoring HUGE factors:

-...
Forum: Rumours & News
13th Apr 2019, 12:02
Replies: 146
Views: 104,502
Posted By ecto1

These are no arguments, these are facts,...

These are no arguments, these are facts, painfully learnt by me at work.

There are many more figures that go into the comparison, none of them changing the result.

For example, the weight of a...
Forum: Rumours & News
13th Apr 2019, 11:10
Replies: 146
Views: 104,502
Posted By ecto1

Because in cars, the penalty for overweight is...

Because in cars, the penalty for overweight is zero at constant speed, and very little at variable speed if you compare with a solution without generative braking*.

Drag (the main reason you need...
Forum: Rumours & News
13th Apr 2019, 10:44
Replies: 146
Views: 104,502
Posted By ecto1

I believe that electric flight could be privately...

I believe that electric flight could be privately explored for research purposes. And probably we need test pilots, and we need to train them and this may be a good plane to do it. So far so good, as...
Forum: Rumours & News
13th Apr 2019, 09:55
Replies: 146
Views: 104,502
Posted By ecto1

Yeah, dream all you want. BTDT. When you have 400...

Yeah, dream all you want. BTDT. When you have 400 times less energy per kg, all things considered, no amount of politics will make it a viable alternative for airborne trasport. Period.

You can...
Forum: Rumours & News
13th Apr 2019, 00:16
Replies: 5,109
Views: 13,267,956
Posted By ecto1

AOA corrects airspeed and then airspeed corrects...

AOA corrects airspeed and then airspeed corrects AOA?
Forum: Rumours & News
12th Apr 2019, 23:59
Replies: 146
Views: 104,502
Posted By ecto1

Car battery (varta e44 77Ah) Weight 18 kg. Usable...

Car battery (varta e44 77Ah) Weight 18 kg. Usable energy stored 2.21MJ. 18 kg Jet A1 or gasoline: 803MJ of usable energy.

Going any fancy battery (lithium ion) will do x2 energy x10 price for the...
Forum: Rumours & News
12th Apr 2019, 09:23
Replies: 191
Views: 146,618
Posted By ecto1

I am also quite uncomfortable with the fact that...

I am also quite uncomfortable with the fact that the pilots struggle to attain the pitch up attitude they wanted. Why let stab have more power than elevator by design?

FDR shows unused elevator...
Forum: Rumours & News
12th Apr 2019, 08:54
Replies: 191
Views: 146,618
Posted By ecto1

Speedbrakes being so close to the CP will not...

Speedbrakes being so close to the CP will not induce a big pitch moment in either direction.

They will kill quite a lot of lift, meaning they will cause the aircraft ROC diminish or even turn the...
Forum: Tech Log
12th Apr 2019, 06:09
Replies: 16
Views: 3,821
Posted By ecto1

I cannot believe my eyes. The nacelles combined...

I cannot believe my eyes. The nacelles combined are almost as wide as the body! Can you supply more evidence to torture me?
Forum: Rumours & News
12th Apr 2019, 05:59
Replies: 5,109
Views: 13,267,956
Posted By ecto1

It doesn't need to be detached to cause a reading...

It doesn't need to be detached to cause a reading that match fdr. Just split shaftwill do. Murphy is lazy.

I find it a impossible coincidence to have a bird strike exactly at maximum gs. Torque at...
Forum: Rumours & News
9th Apr 2019, 20:16
Replies: 5,109
Views: 13,267,956
Posted By ecto1

That's called irreversibility. A screw Jack is...

That's called irreversibility. A screw Jack is irreversible. A ball recirculation screw Jack is reversible. The steering of a truck as an example of the latter.

And to the poster who suggested to...
Forum: Rumours & News
9th Apr 2019, 18:15
Replies: 5,109
Views: 13,267,956
Posted By ecto1

trim drift

Another possible actor in this drama.

When boeing says to hold the trim wheel, when one study how the system is build and when one studies the data trace (and the misterious ND changes during...
Forum: Rumours & News
8th Apr 2019, 22:05
Replies: 5,109
Views: 13,267,956
Posted By ecto1

GPS speed could be used to have an approximation...

GPS speed could be used to have an approximation to real airspeed in case your air data is lost. The error would be huge if you donīt program it carefully (basically wind speed=error). However, if...
Forum: Rumours & News
8th Apr 2019, 21:06
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Electrical gremlin highly unlikely in Ethiopian...

Electrical gremlin highly unlikely in Ethiopian event, because the vane readings when the plane dives are there, and spread all over the range. The vane essentially turned into a g-meter, either by...
Forum: Rumours & News
8th Apr 2019, 13:55
Replies: 5,109
Views: 13,267,956
Posted By ecto1

I know some plane computers are properly built...

I know some plane computers are properly built and programmed and that part of the industry works ok. That's exactly what I meant with 《we know how to do it》.

What I meant is that there is a 《all...
Forum: Rumours & News
8th Apr 2019, 08:38
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Fight the normalization of the abnormal

I see more and more posts selecting solutions which are strictly inside the coordinates of what we "know" it is possible. (EG: more training, software patch...) and not seriously mentioning much...
Forum: Rumours & News
5th Apr 2019, 09:09
Replies: 5,109
Views: 13,267,956
Posted By ecto1

I read your post and reflected about it. I see...

I read your post and reflected about it. I see your point. We musn't have knee jerk reactions. But open your mind for a second:

Disregarding AOA for speed calculation (for example) will contradict...
Forum: Rumours & News
5th Apr 2019, 07:53
Replies: 5,109
Views: 13,267,956
Posted By ecto1

I've read and imagined the "hipersensitive trim"...

I've read and imagined the "hipersensitive trim" theory for short blips before the final dive.

I think it is plausible. I think not enough electric trim force is plausible also.

All we need to...
Forum: Rumours & News
5th Apr 2019, 07:38
Replies: 5,109
Views: 13,267,956
Posted By ecto1

I think there is a reasonable consensus (lest's...

I think there is a reasonable consensus (lest's say 50% chances) that vane shaft broke, keeping AOA vane attached or not, and subsequent alarms and checklists (both useful and useless) threw the crew...
Forum: Rumours & News
4th Apr 2019, 19:37
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Yeah, from 2.1 to 2.3 units, I know. It...

Yeah, from 2.1 to 2.3 units, I know.

It could very well be that the initial blip moved the trim slightly and then stopped, they released and try again but no avail. Each square in the FDR is 3...
Forum: Rumours & News
4th Apr 2019, 19:08
Replies: 5,109
Views: 13,267,956
Posted By ecto1

That the trim wheels didn't move because electric...

That the trim wheels didn't move because electric trim is not powerful enough at such high speed?
Forum: Rumours & News
4th Apr 2019, 15:23
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Sim pilots also put Sully plane back on a runway....

Sim pilots also put Sully plane back on a runway.

In this and many other scenarios, figuring out what to do is a lot more challenge than doing it. That sim test is worth nothing if you know which...
Forum: Rumours & News
4th Apr 2019, 12:52
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Disregarding your choice of words, which I...

Disregarding your choice of words, which I believe is unfortunate, we all agree that you need both things to fail (engineering and training) for most accidents to happen.

I also believe that the...
Forum: Rumours & News
4th Apr 2019, 11:10
Replies: 5,109
Views: 13,267,956
Posted By ecto1

You are of course right. My suggestion would be:...

You are of course right. My suggestion would be: Every freshly build plane must comply with the same rules, regardless being a new design or not. Improving a plane shouldn't imply regulatory...
Forum: Tech Log
4th Apr 2019, 09:57
Replies: 146
Views: 70,671
Posted By ecto1

Scifi, you are 100% right. That would be...

Scifi, you are 100% right.

That would be the way to go. More intelligent software. 100 times more than 737's, still 100 times less than any os or car.

But that I think is scifi in the...
Forum: Rumours & News
4th Apr 2019, 09:49
Replies: 5,109
Views: 13,267,956
Posted By ecto1

You are both right. But Boing introduced a very...

You are both right. But Boing introduced a very "clever" sentence in the AD:

"Electric estabilizer trim can be used to neutralize control column pitch forces before moving the stab trim cutout...
Forum: Rumours & News
4th Apr 2019, 07:49
Replies: 5,109
Views: 13,267,956
Posted By ecto1

PF wins, see FDR traces. On a different...

PF wins, see FDR traces.

On a different topic, failure of control column deflection cutoff override to always closed would mean that if the trim thumb button is pressed nose down, or fails to that...
Forum: Rumours & News
4th Apr 2019, 00:17
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Gums, Yeah, simple FBW gives you that. But...

Gums,

Yeah, simple FBW gives you that. But each philosofy has pros and cons, as you know.

You cited a big pro of simple (closed loop control of pitch rate, for instance) FBW. It will follow...
Forum: Rumours & News
3rd Apr 2019, 22:45
Replies: 5,109
Views: 13,267,956
Posted By ecto1

This is my understanding also, based on the...

This is my understanding also, based on the schematic posted before:

https://www.pprune.org/tech-log/615709-737max-stab-trim-architecture-9.html#post10433110
...
Forum: Rumours & News
3rd Apr 2019, 22:10
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Yes, that is also my impression.

Yes, that is also my impression.
Forum: Rumours & News
3rd Apr 2019, 22:09
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Yes, we do. We are talking 3 sets of switches in...

Yes, we do. We are talking 3 sets of switches in series here: 1) thumb (normally open), 2) control column "extreme deflection" (normally closed) and 3)pedestal cutouts (normally closed).

What I...
Forum: Rumours & News
3rd Apr 2019, 18:45
Replies: 5,109
Views: 13,267,956
Posted By ecto1

Not a very good lesson learned from lion.

I think the procedure should be:

If Trim is bad and you didn't put it there (memory item, but quite intuitive).

1. Bring it back to something reasonable with column switches.
2. Then cut it.
...
Forum: Rumours & News
3rd Apr 2019, 00:39
Replies: 908
Views: 1,097,943
Posted By ecto1

MCAS will never help any pilot in real life. Too...

MCAS will never help any pilot in real life. Too slow.

https://youtu.be/rxPa9A-k2xY

(For those who would like to see instead of visualize what "too slow" means, I posted a link here, guess it...
Forum: Tech Log
3rd Apr 2019, 00:09
Replies: 146
Views: 70,671
Posted By ecto1

I don't particulary fancy the theory of a...

I don't particulary fancy the theory of a mechanical offset because of loose bolt (slipping shaft). People do know how to manufacture square shafts and splines and keyed shafts and safety wire and...
Showing results 1 to 35 of 47
 
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