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Search: Posts Made By: gums
Showing results 1 to 35 of 44
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Forum: Tech Log
12th Jun 2011, 16:56
Replies: 2,070
Views: 612,796
Posted By gums

Mach and THS attitude

Salute!

Somewhere in the cobwebs of this old brain it seems that temperature is a big player to get true mach, especially up high. An SR-71 buddy of mine reminded me of this awhile back, but what...
Forum: Tech Log
11th Jun 2011, 19:26
Replies: 2,070
Views: 612,796
Posted By gums

Caution, warning

From this old curmudgeon, I would wait a bit more until we can look at second-by-second replays of all the data.

Surely, several of us here have misgivings about control law reversion and cockpit...
Forum: Tech Log
10th Jun 2011, 21:15
Replies: 2,070
Views: 612,796
Posted By gums

Some peeks at the "code"

Finally getting some engineering stuff versus the basic things I see in the 'bus manuals.

- We may need to define some terms.

- Smilin' Ed may help us ( a squid golden arm), but the mach...
Forum: Tech Log
10th Jun 2011, 18:38
Replies: 2,070
Views: 612,796
Posted By gums

Super discussion of FBW control laws, yet....

@ ashling:

The snippet I posted of the Viper laws shows function after function related to dynamic pressure/static pressure) so read IAS or CAS or EAS, your call. Not true airspeed. So using the...
Forum: Tech Log
9th Jun 2011, 22:31
Replies: 2,070
Views: 612,796
Posted By gums

Shallow L/D curve and AoA and speed

Well put, Smilin' and PJ. OTOH, I wouldn't call it like balancing a marble on a dinner plate.

The Airbus manuals have a diagram depicting "stall protection", and that graphic looks like that of a...
Forum: Tech Log
9th Jun 2011, 20:51
Replies: 2,070
Views: 612,796
Posted By gums

I'll show you mine, you show me yours

Sorry for poor pic, but I don't have a scanner and didn't wanna drive down to the UPS store.

The graphs at top are the "laws", or functions. lower right are stick pressures versus gee or roll...
Forum: Tech Log
9th Jun 2011, 20:05
Replies: 2,070
Views: 612,796
Posted By gums

Laws, functions, protections, limiters

Sorry if I appear to harp on "too many" laws. It comes from reading and examining all the Airbus manuals I have gotten courtesy of this forum. And I thank you all.

I am gonna take a pic of the...
Forum: Tech Log
8th Jun 2011, 22:38
Replies: 2,070
Views: 612,796
Posted By gums

FBW versus "conventional" one mo' time

I am going with Smilin', Retired and Wolf for several things.

Meanwhile, and for many here that have not flown A FBW system, regardless of the model.....

We must remember that except for the...
Forum: Tech Log
8th Jun 2011, 14:12
Replies: 2,070
Views: 612,796
Posted By gums

Contributions from A33Z - attaboy

I think all of us here appreciate the inputs from A33Z concerning more detail of the control laws, etc. So ATTABOY!

Some of us are still not clear what is taking place with the "trim", however. ...
Forum: Tech Log
7th Jun 2011, 22:28
Replies: 2,070
Views: 612,796
Posted By gums

Forget AoA, worry about speed

Thanks, A33Z.

So if we have the confusers not believing speed, or if they sense low speed, they forget about AoA protection? Does this work if the speed is zero or 1000 kts due to iced up pitots?...
Forum: Tech Log
7th Jun 2011, 16:47
Replies: 2,070
Views: 612,796
Posted By gums

Control laws and mechanical failures

@ Doze: Sorry to cross-reference posts. I apologize.

@ the Bear: It's possible that parts came off the jet or that some systems had mechanical failures ( not computer failures), but I doubt it....
Forum: Tech Log
7th Jun 2011, 15:14
Replies: 2,070
Views: 612,796
Posted By gums

THS trim not immediately commanded

Right on the spot, Doze!

I realize that the THS didn't start moving until later in the sequence of events.

Your AoA protection quote bugs most of we pilots here, as AoA is the primary concern...
Forum: Tech Log
7th Jun 2011, 14:38
Replies: 2,070
Views: 612,796
Posted By gums

Uncommanded nose up trim by pilots

Well, Doze, this is the big question.

How did the THS get trimmed to near the limit?

What happened to AoA protection? And that looks to be a biggie according to the manuals' description of the...
Forum: Tech Log
7th Jun 2011, 13:31
Replies: 2,070
Views: 612,796
Posted By gums

THS versus elevator versus stabilator

Your thinking, Wolf!!! We might all be "thinking" too much, but down deep I feel we're homing in on a quirk with the Airbus design.

To clarify my understanding, it seems the 'bus trims for one...
Forum: Tech Log
6th Jun 2011, 21:26
Replies: 2,070
Views: 612,796
Posted By gums

THS autotrim mechanization

Thanks for the reference, Doze. Already had same for another 'bus variant, but nice to read the real deal.

I still can't see a diagram of how the THS moves with respect to the pilot or autopilot...
Forum: Tech Log
6th Jun 2011, 20:09
Replies: 2,070
Views: 612,796
Posted By gums

THS trim law

Hey, DOZE!!!!!!

Can you show us the law for the THS trim position? Would help a lot of us to understand the first minute or so of the accident.

For example, if I hold a slight back stick to...
Forum: Tech Log
6th Jun 2011, 18:52
Replies: 2,070
Views: 612,796
Posted By gums

Control inputs and feedback

Salute!

Hmmmmmm, PJ's post was there, but I can't find it now. Good charts.

So I shall post two graphs of another FBW stick inputs from my personal Photobucket albuyms that I made myself from...
Forum: Tech Log
6th Jun 2011, 02:31
Replies: 2,070
Views: 612,796
Posted By gums

It's clear....

Thank you, desitter.

I have seen some members here with an almost childlike faith in the sfwe and control logic.

From an old, grizzled pilot that flew the very first fully FBW system in a...
Forum: Tech Log
4th Jun 2011, 20:41
Replies: 2,070
Views: 612,796
Posted By gums

TOGA actions by the system?

I am having trouble finding all the things the plane does if the pilot moves the throttles to the 'TOGA" position. There may be another switch/button, but only one I can find is the throttle...
Forum: Tech Log
4th Jun 2011, 19:11
Replies: 2,070
Views: 612,796
Posted By gums

Protections

I am glad that we got a good input from PJ on the high speed phenomena.

I would take my chances any day about going too fast versus stalling in a large plane. I am not sure if the 'bus has the...
Forum: Tech Log
4th Jun 2011, 15:24
Replies: 2,070
Views: 612,796
Posted By gums

Airbus Flight Safety mag

Sorry, Opto, but I can't access the directory for past issues. I had to save the file and then upload it to my personal domain so's all here could read, learn, think, theorize, et al

Maybe a 'bus...
Forum: Tech Log
4th Jun 2011, 13:41
Replies: 2,070
Views: 612,796
Posted By gums

AoA rules!!! Not speed

Thanks for the link Franz, it should help more here to consider stall recovery and recognition and corrective actions.

The first graphic in the file shows the curve for a typical straight wing,...
Forum: Tech Log
3rd Jun 2011, 20:20
Replies: 2,070
Views: 612,796
Posted By gums

It ain't "simply"

from a recent contributor:

First of all, I do not know of a single FBW system that acts in the same manner as the "old" hydraulic control systems we got used to starting in the 1950's. No...
Forum: Tech Log
3rd Jun 2011, 17:35
Replies: 2,070
Views: 612,796
Posted By gums

A paradigm shift

Salute!

Well put, PJ.

Seems to this old pioneer with the first completely FBW system that we need to separate the functions that protect the airframe and those that make the plane easy to fly...
Forum: Tech Log
3rd Jun 2011, 15:04
Replies: 2,070
Views: 612,796
Posted By gums

AoA, stall and philosophy

1) Whew! Glad some folks corrected/confirmed my geometry concerning flight path and AoA.

Every airplane since the one I checked out in back in early 1904 ( Wilbur was my IP), has depended upon...
Forum: Tech Log
3rd Jun 2011, 02:07
Replies: 2,070
Views: 612,796
Posted By gums

Great graphic, Tailspin

Yeah, Tailspin, just show for the impact velocities BEA has published.

I also got the same numbers using an AoA of 40+/- and pitch of 16 and vertical of 10,000 feet per minute

For Garrison: He...
Forum: Tech Log
3rd Jun 2011, 01:56
Replies: 2,070
Views: 612,796
Posted By gums

AoA and pitch attitude one mo' time

Sorry, all, I misplaced two of the vectors in my explanation. So I'll stick with my story, and only place I find a no-kidding AoA and pitch attitude and both velocity vectors was the one I quoted...
Forum: Tech Log
2nd Jun 2011, 23:14
Replies: 2,070
Views: 612,796
Posted By gums

AoA versus velocity vector, etc

Sorry Garrison, but you must add the pitch attitude to the AoA to get the descent angle.

At impact, we know the BEA figures for 107 knots horizontal and vertical. Another contributor came up...
Forum: Tech Log
2nd Jun 2011, 03:41
Replies: 2,070
Views: 612,796
Posted By gums

Control inputs and stability

@Gray

We went thru this ( relaxed static stability and c.g. and....), and even posted charts and graphs and testimonials. I had to back off of some thoughts once some of the 'bus manuals were...
Forum: Tech Log
2nd Jun 2011, 00:31
Replies: 2,070
Views: 612,796
Posted By gums

High speed stall amd mach

Great points, JT the Moderator.

It could be that the term bandied about refers to mach effects such as I related from the Yeager discussion.

If we exceed the "critical" mach, we can see things...
Forum: Tech Log
1st Jun 2011, 22:33
Replies: 2,070
Views: 612,796
Posted By gums

Stall dynamics/stall displays

@ PJ

- can't answer first question, so we need to have somebody who has gotten close to the edge or even exceeded it to tell us. I can't believe the 'bus aero is so great that some type of...
Forum: Tech Log
1st Jun 2011, 03:36
Replies: 2,070
Views: 612,796
Posted By gums

Auto trim and HUD displays

@ Galaxy:

The Viper "auto trim" seems identical to that of the Airbus except for the bank angle and pitch attitude corrections. Actually, not a bad idea for a heavy, but a bit clumsy for the...
Forum: Tech Log
31st May 2011, 14:19
Replies: 2,070
Views: 612,796
Posted By gums

HUD display

The flight path marker in the A-7, F-16, F-15, F-18 and Space shuttle shows inertial velocity vector. Watch the space shuttle landing tonight and you'll see it NASA TV should use a lot of the HUD...
Forum: Tech Log
30th May 2011, 21:14
Replies: 2,070
Views: 612,796
Posted By gums

little known facts

Well, well, well.

As someone asked the 'bus drivers some posts ago, how many realized that AoA was considered invalid if airspeed below 60 knots? Oh!!! Sheesh, the airspeed is deemed invalid. ...
Forum: Tech Log
30th May 2011, 17:08
Replies: 2,070
Views: 612,796
Posted By gums

c.g./THS effectiveness/elevator effectiveness/ etc

I can't conclude that the 'bus THS and the elevator were "blanked" or rendered ineffective to to the downwash or vortices from the main wing without seeing more data. Flight test results would be...
Showing results 1 to 35 of 44
 
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