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Search: Posts Made By: henra
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Forum: Tech Log
6th Aug 2011, 09:49
Replies: 1,998
Views: 510,826
Posted By henra

Hmmm, where did you find this situation in the...

Hmmm, where did you find this situation in the plots ????

Where was any indication the PF was trying to get the Nose down ??
In contrary the Nose descended a couple of times despite continued NU...
Forum: Tech Log
3rd Aug 2011, 22:27
Replies: 1,998
Views: 510,826
Posted By henra

Agreed ! Was imprecise on my part. ...

Agreed !
Was imprecise on my part.

Although the measured Airspeed was very likely a consequence of the AoA exceeding certain values leading to collapse of the flow around the pitot and not so...
Forum: Tech Log
3rd Aug 2011, 19:53
Replies: 1,998
Views: 510,826
Posted By henra

Hmm, I somehow understand your frustration about...

Hmm, I somehow understand your frustration about this unfortunate systems behaviour, but by all means the Stall warnings were not bogus when they sounded. Even at that time the A/C was still deeply...
Forum: Tech Log
27th Jul 2011, 19:32
Replies: 1,998
Views: 510,826
Posted By henra

Wouldn't there have been also ECAM messages in...

Wouldn't there have been also ECAM messages in case b) or c) if during the correlation window of 10s the speeds would have fallen more than 30kts (which was very likely the case) ?
Forum: Tech Log
25th Jul 2011, 21:59
Replies: 1,998
Views: 510,826
Posted By henra

It got nowhere. The only energy that got...

It got nowhere. The only energy that got converted into heat was the 1/2*m*(0,25m/s)^2 during braking on the ground.
With regard to the air the remaining 1/2*m*(30m/s)^2 is still in the glider....
Forum: Tech Log
25th Jul 2011, 21:39
Replies: 1,998
Views: 510,826
Posted By henra

Thanks mm43 ! That would give us a TAS of...

Thanks mm43 !

That would give us a TAS of 489kts at M0,80 and 500kts at M,82.
Looking at the setting of the RTLU at the time of the beginning of UAS a Mach speed of roughly M0,80 seems likely....
Forum: Tech Log
25th Jul 2011, 20:17
Replies: 1,998
Views: 510,826
Posted By henra

That is EXACTLY the point I was trying to make. ...

That is EXACTLY the point I was trying to make.

It was my point about change of state of the reference system in reply to his remark:


My point being that for the problem of loss of...
Forum: Tech Log
25th Jul 2011, 19:59
Replies: 1,998
Views: 510,826
Posted By henra

One last admission from my side to end this...

One last admission from my side to end this energy discussion:
When I simply enter the 275 kts into the simplified formula of an E6B calculator I get 467,5 kts as TAS.
When calculating considering...
Forum: Tech Log
25th Jul 2011, 19:19
Replies: 1,998
Views: 510,826
Posted By henra

Hmm, I don't want to sound rude, but did you...

Hmm, I don't want to sound rude, but did you really understand my example ?

And yes, the square of the speed before the bleed minus the square of the speed after the bleed is exactly the kinetic...
Forum: Tech Log
25th Jul 2011, 18:59
Replies: 1,998
Views: 510,826
Posted By henra

Dutch_M, you need to be aware that you have to...

Dutch_M, you need to be aware that you have to determine the kinetic energy always with regard to the relvant reference system.
For an aircraft that is the air surrounding it.

To make it easier...
Forum: Tech Log
24th Jul 2011, 21:15
Replies: 1,998
Views: 510,826
Posted By henra

I used the factor of 1,8 (1,798) for standard ISA...

I used the factor of 1,8 (1,798) for standard ISA conditions at 35kft.
Differences to that standard factor may result from temperature differences.
Please note: the BEA value was GS. The...
Forum: Tech Log
24th Jul 2011, 08:27
Replies: 1,998
Views: 510,826
Posted By henra

In fact if you want to be exact, grity is right....

In fact if you want to be exact, grity is right. The equilibrium of drag and thrust is only valid for one speed. So when the AC slows down in the climb, the 1g drag decreases. Therefore the thrust of...
Forum: Tech Log
21st Jul 2011, 17:50
Replies: 1,998
Views: 510,826
Posted By henra

Hmm, I'm afraid you've got a little quirk in your...

Hmm, I'm afraid you've got a little quirk in your calc.

Energy loss is 1/2 (V1^2 - v2^2) which is quite a different thing from 1/2 (v1 - v2)^2.

You might want to recalculate with the adapted...
Forum: Tech Log
21st Jul 2011, 17:22
Replies: 1,998
Views: 510,826
Posted By henra

Not wanting to nitpick, just for the sake of...

Not wanting to nitpick, just for the sake of correctness, it has to be noted that the 275kts and 215kts were IAS.
For any kind of energy calculation you have to take TAS.
In this case that would be...
Forum: Tech Log
20th Jul 2011, 20:00
Replies: 1,998
Views: 510,826
Posted By henra

I find the report quite telling. Working in a...

I find the report quite telling. Working in a bigger company myself I háve the feeling I don't need too much reading between the lines to get an idea of the general 'culture'.

Surely it does not...
Forum: Tech Log
18th Jul 2011, 20:50
Replies: 1,998
Views: 510,826
Posted By henra

If someone tries to tell me that the 727 has a...

If someone tries to tell me that the 727 has a better accident statistic than a modern Airliner, that is exactly the second where I throw the paper away instantly.

FWIW the 747 has a much much...
Forum: Tech Log
17th Jul 2011, 15:02
Replies: 1,998
Views: 510,826
Posted By henra

Yes but in reality manual flying at cruise in bad...

Yes but in reality manual flying at cruise in bad Wx will almost always be the result of an AP handing back a potentially already mistrimmed AC after it reached its limits, read rather after the fact...
Forum: Tech Log
14th Jul 2011, 18:10
Replies: 1,998
Views: 510,826
Posted By henra

I know. The point I was trying to make was that...

I know.
The point I was trying to make was that it was the Flight Law that was determining the position of the control surfaces and not the AP.
Therefore my reference to Normal Law to make this...
Forum: Tech Log
13th Jul 2011, 22:12
Replies: 1,998
Views: 510,826
Posted By henra

Not necessarily. I don't know the exact...

Not necessarily. I don't know the exact implementation of the C* law by Airbus. If it were a straightforward pitch rate law below a certain speed this would be the case but I'm sure it is not exactly...
Forum: Tech Log
13th Jul 2011, 20:56
Replies: 1,998
Views: 510,826
Posted By henra

Dozy, Without judging what is better I...

Dozy,

Without judging what is better I would like to try and point out the difference:
With the THS at a given position there is a speed to which the aircraft will return by itself if you let go...
Forum: Tech Log
13th Jul 2011, 20:38
Replies: 1,998
Views: 510,826
Posted By henra

With regards to inertia, I agree. Regarding...

With regards to inertia, I agree.
Regarding Control surfaces I tend to disagree.
As I already stated the AP disconneting will not so much be the factor here.
The AP makes requests to the FCPC's...
Forum: Tech Log
12th Jul 2011, 22:42
Replies: 1,998
Views: 510,826
Posted By henra

The Question is not so much what the positon of...

The Question is not so much what the positon of the control surface are upon AP disconnect but rather how the change from Roll Normal Law (Rate command) to Roll Direct Law (Deflection) is handled in...
Forum: Tech Log
11th Jul 2011, 22:27
Replies: 1,998
Views: 510,826
Posted By henra

But being on an aviation forum I find it waaaay...

But being on an aviation forum I find it waaaay more relevant and interesting to find out what went wrong and why than assigning blame to any of the involved parties. There are other professions who...
Forum: Tech Log
11th Jul 2011, 21:57
Replies: 1,998
Views: 510,826
Posted By henra

bearfoil, please bear in mind that the gap...

bearfoil,

please bear in mind that the gap betwen Alpha = 2,5° (Cruise AoA) and Alpha = 4° (Stall Warning) is not really much if you are forcing the aircraft from level flight to a RoC of...
Showing results 1 to 24 of 24


 
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