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Search: Posts Made By: bjornhall
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Forum: Tech Log
23rd Sep 2010, 17:20
Replies: 2,054
Views: 1,235,733
Posted By bjornhall

Just because I am so curious, what speed and...

Just because I am so curious, what speed and profile would be used when flying the circuit? I came across a figure somewhere saying minimum V2+50 (with 250 kts suggested); was that maintained all the...
Forum: Tech Log
15th Sep 2010, 19:46
Replies: 108
Views: 31,626
Posted By bjornhall

Robert, that is honestly a rather interesting...

Robert, that is honestly a rather interesting question you're bringing up. :)

What is the stall speed of the Concorde?

Some Nasa engineer in a Usenet forum some 10 years ago told me it was in...
Forum: Tech Log
15th Sep 2010, 06:49
Replies: 108
Views: 31,626
Posted By bjornhall

There is a little too much misinformation on this...

There is a little too much misinformation on this thread by now... Let's not agree on things that are not factual. This is a rather straightforward event, and there is no need to confuse matters with...
Forum: Tech Log
14th Sep 2010, 16:54
Replies: 148
Views: 81,761
Posted By bjornhall

Let's make this a tad more complicated still. ;) ...

Let's make this a tad more complicated still. ;)

From "thrust (force) = drag (force)", does it follow that "power (developed by engine) = power (lost due to drag)"? Or, for that matter, is the...
Forum: Tech Log
12th Sep 2010, 22:40
Replies: 52
Views: 8,436
Posted By bjornhall

But the main reason for the 'north' direction to...

But the main reason for the 'north' direction to change is not system errors but simply the rotation of the earth, and that will be the same. So you should see roughly the same effect in the air as...
Forum: Tech Log
11th Sep 2010, 08:14
Replies: 108
Views: 31,626
Posted By bjornhall

However; could this have played out any...

However; could this have played out any differently? Possible (right...) alternative outcomes:

Miracle outcome #1: The crew rejects at some 190 kts and roll onto the grass doing at least 100 kts....
Forum: Tech Log
11th Sep 2010, 07:47
Replies: 108
Views: 31,626
Posted By bjornhall

This kind of stuff should not be left unanswered:...

This kind of stuff should not be left unanswered:



It was about one ton overweight. A lot on a C172, 0.5 % on a Concorde. It had no influence on anything. Not good, but not a factor.


...
Forum: Tech Log
11th Sep 2010, 07:17
Replies: 108
Views: 31,626
Posted By bjornhall

I think the final two findings in the report are...

I think the final two findings in the report are interesting:

Many pieces of the aircraft found along the track indicate that severe damage to the aircraft’s structure was caused in flight by the...
Forum: Tech Log
10th Sep 2010, 10:04
Replies: 108
Views: 31,626
Posted By bjornhall

The aircraft was not on fire before V1; in fact,...

The aircraft was not on fire before V1; in fact, it was perfectly safe to fly at V1. The information available to the crew did not tell them the aircraft would be unsafe to fly; what they did know is...
18th Aug 2010, 19:50
Replies: 198
Views: 31,786
Posted By bjornhall

Those "predictable 3G" might be expected when...

Those "predictable 3G" might be expected when landing on a flat, unobstructed, suitably firm surface (provided the darned thing actually works, etc etc, see previous post). But once you pull the...
17th Aug 2010, 20:44
Replies: 72
Views: 9,905
Posted By bjornhall

I agree with the part that if a wing drops...

I agree with the part that if a wing drops uncontrollably, trying to raise it is not the ideal thing to do! :ok: Recover from the stall first, then level the wings.

But if one does try to do it...
17th Aug 2010, 20:38
Replies: 198
Views: 31,786
Posted By bjornhall

The usual error of trying to draw conclusions...

The usual error of trying to draw conclusions from statistics using only mean values. One needs higher order moments as well in order to draw any kind of meaningful conclusions from the data itself...
17th Aug 2010, 19:43
Replies: 72
Views: 9,905
Posted By bjornhall

Doing some substantial googling, one finds a...

Doing some substantial googling, one finds a number of references to the rudder-only method on "my personal thoughts of flight instruction/stall training" type sites...

Whereas all authoritative...
12th Aug 2010, 10:37
Replies: 72
Views: 9,905
Posted By bjornhall

Yes, I think we more or less agree, when I am...

Yes, I think we more or less agree, when I am saying the wings do not need to stall at the same time I mean not exactly at the same time. A small asymmetry, such as one wing being slightly more...
12th Aug 2010, 10:09
Replies: 72
Views: 9,905
Posted By bjornhall

We are into the fine tuning parts of the...

We are into the fine tuning parts of the discussion here... ;) Everyone probably knows and agrees that a large aileron input close to the stall will often make that wing stall, and that an aileron in...
11th Aug 2010, 22:08
Replies: 72
Views: 9,905
Posted By bjornhall

barrow, just because you haven't understood...

barrow, just because you haven't understood something doesn't make it less true...

Go up in an airplane and do some experimentation on your own then. You should be able to discover that what you...
Forum: Tech Log
11th Aug 2010, 16:14
Replies: 8
Views: 2,293
Posted By bjornhall

This is something I haven't been able to look up...

This is something I haven't been able to look up so been meaning to ask: What are the BRNAV requirements regarding redundancy? E.g., do you need two GPS units and if one fails you are non-BRNAV due...
11th Aug 2010, 12:42
Replies: 72
Views: 9,905
Posted By bjornhall

You are closer to a spin if you stall with wings...

You are closer to a spin if you stall with wings level and a side slip than if you stall with a wing drop and no side slip.

Spin requires stall, departure (i.e. none or negative roll damping,...
10th Aug 2010, 18:33
Replies: 72
Views: 9,905
Posted By bjornhall

The only way to create a rolling moment with the...

The only way to create a rolling moment with the rudder is to induce a sideslip. Rhetorical question: Would we rather stall in coordinated or uncoordinated flight?

The scenario: Reduce the...
Forum: Tech Log
10th Aug 2010, 11:56
Replies: 7
Views: 1,228
Posted By bjornhall

The reference is the book mentioned in the...

The reference is the book mentioned in the original post... Here is a more specific link:
More About Energy and Power [Ch. 7 of See How It Flies]...
Forum: Jet Blast
27th Jan 2010, 19:40
Replies: 60
Views: 6,174
Posted By bjornhall

What seems to be temporarily forgotten in the...

What seems to be temporarily forgotten in the present society is that quite independently of what goals the shareholders have in mind, companies are means to other ends. If the shareholders' aim for...
26th Jan 2010, 06:48
Replies: 14
Views: 1,170
Posted By bjornhall

8. There will be no windows on aircraft, since...

8. There will be no windows on aircraft, since nobody will have time to look outside anyway.

9. Private aviation will generally come to a standstill, once it is realized that if you're gonna play...
16th Jan 2010, 10:58
Replies: 12
Views: 4,133
Posted By bjornhall

Wouldn't this one fit the new British carriers...

Wouldn't this one fit the new British carriers rather nicely? Should be a lot cheaper than the F-35. Of course, capability would be lower too; depends on what one needs and can afford I suppose...
11th Jan 2010, 13:50
Replies: 50
Views: 4,889
Posted By bjornhall

Generally, those who say things like "long live...

Generally, those who say things like "long live common sense", have no idea what common sense even is.

Common sense is knowledge already acquired and internalized.

Which takes us right back...
10th Jan 2010, 19:15
Replies: 50
Views: 4,889
Posted By bjornhall

Hi PD, Thanks for the offer! I also use...

Hi PD,

Thanks for the offer! I also use other formal risk assessment and mitigation methods in project management, and I agree that taking such methods directly from engineering and management...
Showing results 1 to 25 of 480
 


 
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