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Search: Posts Made By: gums
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Forum: Tech Log
11th Aug 2011, 04:11
Replies: 1,998
Views: 510,070
Posted By gums

Maybe a good time for philosophy while we wait

Well thank you, De Sitter, and hope I am one of the 'real" pilots.

So maybe we take a break and actually discuss philosophy involved with the design considerations and the training and the...
Forum: Tech Log
10th Aug 2011, 15:51
Replies: 1,998
Views: 510,070
Posted By gums

My point about force versus deflection is that...

My point about force versus deflection is that the stick felt more like what we were used to. We trimmed off pressure not stick deflection. the thing only moved about 1/8 th inch.

Unless the...
Forum: Tech Log
10th Aug 2011, 14:42
Replies: 1,998
Views: 510,070
Posted By gums

Force versus movement for trim

Interesting about trim feel, and it could have played a role in Viper stick implementation.

The thing uses stick force per gee or roll rate, so it was real easy to trim off the control pressure to...
Forum: Tech Log
8th Aug 2011, 21:58
Replies: 1,998
Views: 510,070
Posted By gums

AP disconnect and autotrim

You are correct, TK.

And seems to me that the 'bus AP disconnect is very benign.

The problem we dinosaurs have is we still see things like "overspeed/mach" inputs and such versus simply letting...
Forum: Tech Log
8th Aug 2011, 17:53
Replies: 1,998
Views: 510,070
Posted By gums

Autotrim, THS. "hand flying"

Many previous planes had "beeps" or other indications that the autopilot or the "autotrim" ( hate that word) was moving the HS. In fact, an infamous crash near Indianapolis caused by LOC and ice...
Forum: Tech Log
7th Aug 2011, 15:43
Replies: 1,998
Views: 510,070
Posted By gums

Pitch control and longitudinal stability

Hats off the Rudderrat for pointing out one of the unusual characterisctics of the FBW concepts that emphasize Gee versus AoA for pitch laws.

The stability that Smilin'Ed describes can be...
Forum: Tech Log
4th Aug 2011, 23:39
Replies: 1,998
Views: 510,070
Posted By gums

control stick feedback

Since the late 60's the only feedback to the control stick/yoke has been artificial. Exceptions were the planes with mechanical linkage to the control surface actuators, and even those had little...
Forum: Tech Log
4th Aug 2011, 16:34
Replies: 1,998
Views: 510,070
Posted By gums

control "feel" and mach versus stall

For the subsonic wing shape you can "feel" buffet and "stiffening" of the stick at the critical mach, whether via artificial control stick mechanisms or just "in the seat of your pants". You can...
Forum: Tech Log
4th Aug 2011, 04:01
Replies: 1,998
Views: 510,070
Posted By gums

data reduction

Thank you TK and Shad. Makes my day.

We must be careful looking at the recorded data unless we have put the test vehicle and recorders thru similar environments and exerted a lotta effort to...
Forum: Tech Log
4th Aug 2011, 03:26
Replies: 1,998
Views: 510,070
Posted By gums

You are correct, Dozy, the crew never said that. ...

You are correct, Dozy, the crew never said that. I was being sarcastic about the system design that "protects" hapless pilots from getting into trouble. Do we have "pinball wizards" or real pilots...
Forum: Tech Log
4th Aug 2011, 01:36
Replies: 1,998
Views: 510,070
Posted By gums

stall warning, displays, AoA sensors, BEA comments

Thank you, Wozzo, very interesting press release. Seems that some BEA investigators are concerned about some of the same things that several here are, as well. And it's not all strictly pilot...
Forum: Tech Log
1st Aug 2011, 22:29
Replies: 1,998
Views: 510,070
Posted By gums

back to the "technical" stuff

- First of all, and to A33Z, what's the document you are using for elevator deflection per "g"? And for the c.g. versus elevator moment arm? etc.

About 95% of the military FBW jets have the...
Forum: Tech Log
30th Jul 2011, 01:12
Replies: 1,998
Views: 510,070
Posted By gums

Spag's cvr transcript translation

Thanks to all for potential links and such.

Reading Spag's translation makes me cry.

Remember, the plane "protects" you.

Makes me cry again.

Over 3 minutes to see what's happening and...
Forum: Tech Log
30th Jul 2011, 00:11
Replies: 1,998
Views: 510,070
Posted By gums

Some report stuff in English, please

Salute!

I still cannot find any official BEA report in English.

I realize that I am a primitive Anglo from the Colonies, but PLZ.

Would be nice to see what the other few dozen folks here...
Forum: Tech Log
27th Jul 2011, 15:24
Replies: 1,998
Views: 510,070
Posted By gums

stick and momentum

- We never had a left-handed side stick.
- We never had problems with lefties using a stick mounted just above and to the right of one's right knee

Many of us were worried about our newbies ( ...
Forum: Tech Log
27th Jul 2011, 03:18
Replies: 1,998
Views: 510,070
Posted By gums

side stick? no biggie

There is no big deal using the side stick.

A few thousand, well maybe hundreds, of pilots have flown the Viper since the mid 70's. Our ops chief demanded we all have one ride in the back seat of...
Forum: Tech Log
26th Jul 2011, 20:43
Replies: 1,998
Views: 510,070
Posted By gums

Overspeed warning

Yeah, Doze, and PJ has corrected me.

Consider me "corrected", heh heh.

Looking for a plausible reason to command a pitch change, especially after the pilot stated he had assumed manual control...
Forum: Tech Log
26th Jul 2011, 18:05
Replies: 1,998
Views: 510,070
Posted By gums

mach and stall

Thx, PJ, good review.

Gotta admit, that after a few years in straight wing planes I was then spoiled by sturdy subsonic wings and true supersonic wings. My straight wing jets "stalled" as you...
Forum: Tech Log
26th Jul 2011, 02:09
Replies: 1,998
Views: 510,070
Posted By gums

Yeah, 'nuts, the stall AoA for the Airbus may...

Yeah, 'nuts, the stall AoA for the Airbus may have something more to do with mach than I am familiar with. Most jets I flew stalled at an AoA, whether supersonic or subsonic. The supersonic regime...
Forum: Tech Log
25th Jul 2011, 22:51
Replies: 1,998
Views: 510,070
Posted By gums

How to enter a deep stall

I am amazed at all the kinetic energy and OAT and such discussion here for last two days.

The profile of AF447, as we know it, and regardless of control laws or pilot inputs, resembles the classic...
Forum: Tech Log
24th Jul 2011, 20:13
Replies: 1,998
Views: 510,070
Posted By gums

Weather or....

With all due respect, Wally, all of us, as pilots and SLF's, have flown thru bad weather. Sometimes we didn't have a choice due to the mission, and I feel most of us avoided obvious bad weather.
...
Forum: Tech Log
24th Jul 2011, 04:54
Replies: 1,998
Views: 510,070
Posted By gums

"cause" and "contributing factors"

This accident/crash will be one that lives in the books for a long time - many lessons-learned. And the "cause" will not be a simple pilot error or airplane problem.

Without posting 1,000 words,...
Forum: Tech Log
16th Jul 2011, 21:51
Replies: 1,998
Views: 510,070
Posted By gums

recoverable, training, aero stuff

First - A33'a tidbit scares the hell outta me.



Deja vu one more time. Exactly what the Viper did if the confusers all failed ( in our case, it was total power loss to them, and the FCS folks...
Forum: Tech Log
15th Jul 2011, 17:14
Replies: 1,998
Views: 510,070
Posted By gums

To J T the Mod - a FBW thread?

I suggest we interested parties crank up a thread in the Tech Forum specifically devoted to FBW systems - philosophy, real engineering crapola, human factors, experience from several folks here when...
Forum: Tech Log
15th Jul 2011, 03:46
Replies: 1,998
Views: 510,070
Posted By gums

Viper stabilators

For DJ77, et al:

- The stabilators, or horizontal stabilizers/elevators, moved +/- 21 degrees.
- They had a symmetrical airfoil, and...
- They were interchangeable from one side to the other
-...
Forum: Tech Log
14th Jul 2011, 14:45
Replies: 1,998
Views: 510,070
Posted By gums

maintaining the stall

Excellent presentation by Owain, just peachy.

I also wonder about recovery possibilities if the THS was moved to the opposite position/angle from that which existed all the way down to the ocean....
Forum: Tech Log
14th Jul 2011, 02:49
Replies: 1,998
Views: 510,070
Posted By gums

c.g. and longitudinal stability

And yes, TK, I have been here recently.

Good points Harry, no problem with you jumping in.

As the c.g. moves back to the center of aero pressure, or so called neutral point, the jet has less...
Forum: Tech Log
13th Jul 2011, 18:56
Replies: 1,998
Views: 510,070
Posted By gums

pitch moments, gee and tranducers

I welcome the "fresh blood" to the fray. Attaboy.

- Although the pitch moment chart I posted is for another aircraft, it illustrates two points ( one positive, one negative) that result in little...
Forum: Tech Log
12th Jul 2011, 21:03
Replies: 1,998
Views: 510,070
Posted By gums

THS and deep stall characteristics

Owain seems to have a decent description of some of the factor involving the THS and its effects upon all the moment arms.

I refer all to my graph of the Viper pitch moments ( will find the post...
Forum: Tech Log
11th Jul 2011, 23:21
Replies: 1,998
Views: 510,070
Posted By gums

autotrim, stall warning, stable stall, et al...

Hard to keep up, and I am a very fast reader.

- Zorin asked about the autotrim, and others have tried to figure it out. From what I see of the tech manuals and inputs from other contributors, it...
Showing results 1 to 30 of 30


 
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