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Search: Posts Made By: ecto1
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13th Apr 2019, 12:40
Replies: 146
Views: 79,957
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:

-...
13th Apr 2019, 12:02
Replies: 146
Views: 79,957
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...
13th Apr 2019, 11:10
Replies: 146
Views: 79,957
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...
13th Apr 2019, 10:44
Replies: 146
Views: 79,957
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...
13th Apr 2019, 09:55
Replies: 146
Views: 79,957
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...
13th Apr 2019, 00:16
Replies: 5,125
Views: 10,403,272
Posted By ecto1

AOA corrects airspeed and then airspeed corrects...

AOA corrects airspeed and then airspeed corrects AOA?
12th Apr 2019, 23:59
Replies: 146
Views: 79,957
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...
12th Apr 2019, 09:23
Replies: 191
Views: 117,362
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...
12th Apr 2019, 08:54
Replies: 191
Views: 117,362
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: 3,215
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?
12th Apr 2019, 05:59
Replies: 5,125
Views: 10,403,272
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...
9th Apr 2019, 20:16
Replies: 5,125
Views: 10,403,272
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...
9th Apr 2019, 18:15
Replies: 5,125
Views: 10,403,272
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...
8th Apr 2019, 22:05
Replies: 5,125
Views: 10,403,272
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 don´t program it carefully (basically wind speed=error). However, if...
8th Apr 2019, 21:06
Replies: 5,125
Views: 10,403,272
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...
8th Apr 2019, 13:55
Replies: 5,125
Views: 10,403,272
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...
8th Apr 2019, 08:38
Replies: 5,125
Views: 10,403,272
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...
5th Apr 2019, 09:09
Replies: 5,125
Views: 10,403,272
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...
5th Apr 2019, 07:53
Replies: 5,125
Views: 10,403,272
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...
5th Apr 2019, 07:38
Replies: 5,125
Views: 10,403,272
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...
4th Apr 2019, 19:37
Replies: 5,125
Views: 10,403,272
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...
4th Apr 2019, 19:08
Replies: 5,125
Views: 10,403,272
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?
4th Apr 2019, 15:23
Replies: 5,125
Views: 10,403,272
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...
4th Apr 2019, 12:52
Replies: 5,125
Views: 10,403,272
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...
4th Apr 2019, 11:10
Replies: 5,125
Views: 10,403,272
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...
Showing results 1 to 25 of 47
 


 
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