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Search: Posts Made By: gums
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Forum: Tech Log
22nd Apr 2014, 21:00
Replies: 813
Views: 153,889
Posted By gums

@ Doze The AF447 was not in the...

@ Doze



The AF447 was not in the "primary" control laws. And seems that the crew at Habsheim did something to avoid the "primary" laws for their slow, high AoA pass.

It appears that the...
Forum: Tech Log
11th Apr 2014, 15:18
Replies: 813
Views: 153,889
Posted By gums

@ vilas I don't disagree with you about...

@ vilas

I don't disagree with you about AF447. My concern is that it appears some 'bus drivers seem to feel that they can't stall the jet, and then the lack of certain "protections" in the...
Forum: Tech Log
10th Apr 2014, 21:45
Replies: 813
Views: 153,889
Posted By gums

@ Barking It is interesting that we are...

@ Barking

It is interesting that we are still here talking about the FCS implementation and such after such a long time.

The point is that many heavy pilots have never flown their planes to...
Forum: Tech Log
22nd Mar 2014, 02:36
Replies: 813
Views: 153,889
Posted By gums

Agree with Chris and Doze. He was too fast,...

Agree with Chris and Doze.

He was too fast, and had to keep power low to finally reach max AoA or whatever some want to call it. Then was slow getting the power back in.

As with others here, I...
Forum: Tech Log
21st Mar 2014, 21:23
Replies: 813
Views: 153,889
Posted By gums

Yo! Direct hit, Doze. It all...

Yo!

Direct hit, Doze.



It all comes back to a poorly executed, poorly planned/practiced "display".

Sheesh.
Forum: Tech Log
19th Mar 2014, 20:50
Replies: 813
Views: 153,889
Posted By gums

I do not disagree that lift must change for a...

I do not disagree that lift must change for a flight path change.

The point is that the change in lift does not have to be due to even a tenth of a gee or a knot or two. And it only has to change...
Forum: Tech Log
19th Mar 2014, 04:12
Replies: 813
Views: 153,889
Posted By gums

Salute! It's good for some to realize that...

Salute!

It's good for some to realize that you do not have to increase speed/AoA to climb or descend.

Now, ya gotta be gentle with the throttle(s), but a well-trimmed plane (or one with max AoA...
Forum: Tech Log
15th Mar 2014, 22:18
Replies: 813
Views: 153,889
Posted By gums

Gotta tellya, Confit, that until I see the actual...

Gotta tellya, Confit, that until I see the actual FCS charts/functions for modes and such, I'll stay with Doze and others that the plane gave everything it was "programmed " do.

My problem is with...
Forum: Tech Log
13th Mar 2014, 19:28
Replies: 813
Views: 153,889
Posted By gums

dragging it out, heh?

C'mon, Confit.

The jet and its FCS worked as advertised. And then the laws of physics and aero came into play.

It could be that 'bus folks did not do enough testing at altitude to examine all...
Forum: Tech Log
12th Mar 2014, 21:32
Replies: 813
Views: 153,889
Posted By gums

I thot Doze or another contributor tried to...

I thot Doze or another contributor tried to duplicate the stall/recovery for AF447 in the sim.

Unless early flight tests showed a poor pitch co-efficeint at a high AoA, as we had in the Viper,...
Forum: Tech Log
7th Mar 2014, 03:20
Replies: 813
Views: 153,889
Posted By gums

Thank you, Doze. What I wanted to confirm. I...

Thank you, Doze. What I wanted to confirm. I feel we are on the same page, and I have actual experience flying the "limiters" or "protections" in a FBW system.
Forum: Tech Log
6th Mar 2014, 20:54
Replies: 813
Views: 153,889
Posted By gums

Forgive me, but I can't find the reference to a...

Forgive me, but I can't find the reference to a re-enactment of the crash, Doze. Where?

I also go with 'bird and others that another degree of AoA would only have increased drag unless the power...
Forum: Tech Log
3rd Mar 2014, 20:42
Replies: 813
Views: 153,889
Posted By gums

Thank you, 'bird. Exactly right, Confit....

Thank you, 'bird.


Exactly right, Confit. And 'bird. The spool up was very late, regardless of what the pilot intended. It was too damned late. The big fans take lots longer to spool up in the...
Forum: Tech Log
28th Feb 2014, 16:03
Replies: 813
Views: 153,889
Posted By gums

Thank you, Rouli. Well stated. I flew two...

Thank you, Rouli. Well stated.

I flew two jets with AoA limiters, and I never failed to notice what was happening, nor did I depend on the limiters to "save" me because I flew into a dire...
Forum: Tech Log
26th Feb 2014, 22:07
Replies: 813
Views: 153,889
Posted By gums

Thank you, Rouli. I jump back in from the...

Thank you, Rouli.

I jump back in from the peanut "light" gallery.

Good grief, we can go over all the control laws for years. As Doze and I and others seem to agree, it wasn't the control laws...
Forum: Tech Log
23rd Feb 2014, 01:22
Replies: 813
Views: 153,889
Posted By gums

@ Nuts Yeah, my understanding of the...

@ Nuts



Yeah, my understanding of the plots was an 8 degree FPA or so. No biggie. I fully understand the relationships between AoA and lift and velocity.

My concerns are that many folks...
Forum: Tech Log
22nd Feb 2014, 20:59
Replies: 813
Views: 153,889
Posted By gums

@ Nuts I can see "trimming" to a CAS/AoA,...

@ Nuts

I can see "trimming" to a CAS/AoA, but not a mach or TAS. For a small altitude delta, the TAS or mach would not vary much. I only flew 2 jets that had a "mach hold" using otto ( F-102A and...
Forum: Tech Log
22nd Feb 2014, 19:44
Replies: 813
Views: 153,889
Posted By gums

I am with OG on discussion, protocol and such. ...

I am with OG on discussion, protocol and such.

@Nuts

How can you "trim" to TAS?
Secondly, what is happens to phugoid phenomena when thrust is greater than drag? I would imagine it would be...
Forum: Tech Log
21st Feb 2014, 19:15
Replies: 813
Views: 153,889
Posted By gums

Good points, Okie. I also remind folks of...

Good points, Okie.

I also remind folks of Sioux City and the Carmel accidents where the crews used only power once they established a "trimmed" AoA/airspeed that the plane "liked".

I gotta...
Forum: Tech Log
21st Feb 2014, 14:27
Replies: 813
Views: 153,889
Posted By gums

Interesting graph, Nuts Although the...

Interesting graph, Nuts

Although the magnitude of the phugoid seems a bit large, we still see a very rapid increase in FPA and climb rate.

I bet that the pilot would have donated vital parts of...
Forum: Tech Log
18th Feb 2014, 22:56
Replies: 813
Views: 153,889
Posted By gums

Great inputs and insight from Nuts and Doze. ...

Great inputs and insight from Nuts and Doze.

As far as Okie's comments about flying at the edge of the envelope.....

It seems to me that a functional 'bus could be flown to the "limiters" at a...
Forum: Tech Log
18th Feb 2014, 16:54
Replies: 813
Views: 153,889
Posted By gums

TNX for the reference. I agree, hard to...

TNX for the reference. I agree, hard to accurately interpret, but look like the duplication follows the actual parameters well. So the crash was inevitable, huh?

Secondly:


From looking at...
Forum: Tech Log
17th Feb 2014, 21:28
Replies: 813
Views: 153,889
Posted By gums

I thot I saw a reference to a 'bus driver that...

I thot I saw a reference to a 'bus driver that tried to duplicate the crash. At a safe altitude, of course, and with lottsa prior planning. Reference requested.

I must also point out that...
Forum: Tech Log
16th Feb 2014, 20:32
Replies: 813
Views: 153,889
Posted By gums

Thank you, Okie. From Okie's posts...

Thank you, Okie.

From Okie's posts previously, I assume he had experience in a FBW system before the AB320 came on line. The Block 10 comment is the clue, and I flew Bk1,5,10 and 15.

The...
Forum: Tech Log
16th Feb 2014, 16:34
Replies: 813
Views: 153,889
Posted By gums

Power required versus power available

Guess I had a different aero course and pilot training courses than those here.

I can't find a single reference to the effect that we must increase lift to climb, with the notable exception of...
Forum: Tech Log
14th Feb 2014, 22:50
Replies: 813
Views: 153,889
Posted By gums

Yeah, Chris, we are on the same page. I did...

Yeah, Chris, we are on the same page.

I did not mean to challenge techniques and such, just point out that "power" was the problem at the flyby, and not the flight control laws and such.
Forum: Tech Log
14th Feb 2014, 20:45
Replies: 813
Views: 153,889
Posted By gums

C'mon, Chris. The potential rate of climb is...

C'mon, Chris.

The potential rate of climb is a simple function of power available versus power required for your configuration.

My light plane training was the pitch attitude and then power for...
Forum: Tech Log
13th Feb 2014, 20:26
Replies: 813
Views: 153,889
Posted By gums

Thanks 'bird and Nuts We pilots must...

Thanks 'bird and Nuts

We pilots must remember that rate of climb is the delta between thrust available and thrust required for the AoA and weight and...... ( power required)

It's why the nasal...
Forum: Tech Log
13th Feb 2014, 14:36
Replies: 813
Views: 153,889
Posted By gums

Well, we get to replay the incident over and...

Well, we get to replay the incident over and over......

Before I return to the "monitor mode", I think Doze summarized the whole thing, and it wasn't "flare mode" or altimeter settings or anything...
Forum: Tech Log
11th Feb 2014, 14:50
Replies: 813
Views: 153,889
Posted By gums

From the "light" peanut gallery @ Doze and...

From the "light" peanut gallery @ Doze and Chris....

Yep, Doze, "pride" gets in the way one or two times, but usually only once. Our aviation mistress is harsh in that regard.

The "press on"...
Forum: Tech Log
28th Jan 2014, 23:06
Replies: 813
Views: 153,889
Posted By gums

Thanks, Chris. Way I see it as well, with...

Thanks, Chris.

Way I see it as well, with more to add.

Fer chrissakes, if you are trying to impress the folks watching, least you could do was to have made a few practice runs ahead of time. ...
Forum: Tech Log
12th Jan 2014, 18:07
Replies: 813
Views: 153,889
Posted By gums

@ 'bird: Sorry, I needed to make it clear...

@ 'bird: Sorry, I needed to make it clear that I could have duplicated the crash, as even with max back stick, my jet would only hang at 27 deg AoA and 1 gee. No way to command a higher AoA or...
Forum: Tech Log
10th Jan 2014, 21:58
Replies: 813
Views: 153,889
Posted By gums

Thanks, Conf I'll have to dig out my FCOM...

Thanks, Conf

I'll have to dig out my FCOM stuff from the AF447 files and see how that throttle works.

Of course, a few practice flyby runs may have shown any problems with the throttle...
Forum: Tech Log
10th Jan 2014, 14:58
Replies: 813
Views: 153,889
Posted By gums

@conf WRT to my comment about getting max...

@conf

WRT to my comment about getting max performance when commanding max performance in the Viper....



Which features compromise the pilot's command for max performance?

I also wonder if...
Forum: Tech Log
9th Jan 2014, 19:58
Replies: 813
Views: 153,889
Posted By gums

While I disagree with 'bird about using "direct...

While I disagree with 'bird about using "direct law", I find a flaw in your logic, Doze.

You point out two factors that are essential to understanding the final outcome.

- "improvised" ???? ...
Showing results 1 to 35 of 35


 
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