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Search: Posts Made By: PBL
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Forum: Tech Log
9th Aug 2010, 07:41
Replies: 154
Views: 39,880
Posted By PBL

BOAC, I am not sure what you are quibbling...

BOAC,

I am not sure what you are quibbling about. Of course I have selectively quoted - all quoting is selective.

The FOG in 2.2.8 is addressing loss of lateral stability (wing drop) and says...
Forum: Tech Log
8th Aug 2010, 16:20
Replies: 154
Views: 39,880
Posted By PBL

While looking through the WWW for papers related...

While looking through the WWW for papers related to the 2010 AIAA GNC conference papers on LOC, I came across a RAeS FOG report from 2008 or later (there is no date on it) on upset recovery that I...
Forum: Tech Log
6th Aug 2010, 09:39
Replies: 154
Views: 39,880
Posted By PBL

BOAC, the Toronto session at the 2010 AIAA...

BOAC,

the Toronto session at the 2010 AIAA Guidance, Navigation and Control annual meeting was just one waypoint in a long history of targeted research on LOC.

Any "initiative" started long...
Forum: Tech Log
6th Aug 2010, 07:57
Replies: 154
Views: 39,880
Posted By PBL

Nice post from error_401. It occurs to me...

Nice post from error_401.

It occurs to me that no one (including me) has yet cited the certification requirements, although I have referred to them. The definition of "stall" is in CS 25 201 (d)....
Forum: Tech Log
31st Jul 2010, 18:33
Replies: 154
Views: 39,880
Posted By PBL

Centaurus, I said: Let me...

Centaurus,



I said:

Let me rephrase. The report said on pp 6-7 that when the aircraft stalled "the height remaining ... was insufficient for a recovery". There was lots wrong with their...
Forum: Tech Log
31st Jul 2010, 08:47
Replies: 154
Views: 39,880
Posted By PBL

OK, BOAC, you are concerned about the specific...

OK, BOAC, you are concerned about the specific condition in which a pilot executing a vertical escape manoeuvre of some sort is unaware of the position of the longitudinal trim. There are two ways in...
Forum: Tech Log
30th Jul 2010, 21:34
Replies: 154
Views: 39,880
Posted By PBL

BOAC, I took your proposal seriously enough...

BOAC,

I took your proposal seriously enough to spend a number of hours today trying to figure out if it was true or not. I thought the results I obtained were worth broadcasting, as a contribution...
Forum: Tech Log
30th Jul 2010, 16:17
Replies: 154
Views: 39,880
Posted By PBL

One of the difficulties with making comments...

One of the difficulties with making comments "against" specific people is that what starts out as a legitimate difference in emphasis can turn into an artificial polarity, and I would rather not see...
Forum: Tech Log
29th Jul 2010, 20:48
Replies: 154
Views: 39,880
Posted By PBL

Yes, indeed! In fact, I'm dealing with such...

Yes, indeed!

In fact, I'm dealing with such issues this very week.

PBL
Forum: Tech Log
29th Jul 2010, 17:44
Replies: 154
Views: 39,880
Posted By PBL

I don't work for Airbus, and their flight test...

I don't work for Airbus, and their flight test program is likely proprietary information, so I am not in a position to state authoritatively anything about it at all.



Opinions may differ and...
Forum: Tech Log
29th Jul 2010, 12:55
Replies: 154
Views: 39,880
Posted By PBL

HN39, Your reference 1 will be quite useful...

HN39,

Your reference 1 will be quite useful for those here who don't know what is taken to determine a "full stall". I point out -again - that the flight tests are only performed to determine...
Forum: Tech Log
28th Jul 2010, 14:40
Replies: 154
Views: 39,880
Posted By PBL

The blog post is now there: Understanding...

The blog post is now there: Understanding Aerodynamics of Stalls (http://www.abnormaldistribution.org/2010/07/28/understanding-aerodynamics-of-stalls/)

PBL
Forum: Tech Log
28th Jul 2010, 12:13
Replies: 154
Views: 39,880
Posted By PBL

While the English and their former colonists have...

While the English and their former colonists have persisted with the adaptation of a mercantile system of units to science, I am not at all in accord with the suggestion to because I hold it...
Forum: Tech Log
26th Jul 2010, 12:49
Replies: 154
Views: 39,880
Posted By PBL

What I was hoping it would tell you is that...

What I was hoping it would tell you is that C_L_Max occurs at different angles of attack depending on Mach number. Which shows (if you take C_L_Max to represent the point of stall) that the point of...
Forum: Tech Log
23rd Jul 2010, 10:12
Replies: 154
Views: 39,880
Posted By PBL

To surprise you even more, here is a recent...

To surprise you even more, here is a recent diagram from Boeing (http://www.boeing.com/commercial/aeromagazine/aero_12/attack_fig4.html) showing clearly that C_L_Max is dependent on Mach number.
...
Forum: Tech Log
20th Jun 2010, 16:27
Replies: 154
Views: 39,880
Posted By PBL

I don't think so. I am much more inclined to cut...

I don't think so. I am much more inclined to cut out of the discussion. I am getting tired of expounding basic aerodynamics and being told it's all wrong.

PBL
Forum: Tech Log
20th Jun 2010, 09:28
Replies: 154
Views: 39,880
Posted By PBL

Curiouser and curiouser, said Alice. It...

Curiouser and curiouser, said Alice.

It varies with dynamic pressure. Maybe I can mention the term EAS and leave the rest to you?



What an extraordinary view. It appears to me to conflict...
Forum: Tech Log
20th Jun 2010, 06:51
Replies: 154
Views: 39,880
Posted By PBL

No, it's not correct. The angle of attack at...

No, it's not correct. The angle of attack at which a high-performance wing will stall is a function of the speed of the air flowing over it, exactly contrary to what DFC said in hisher first...
Forum: Tech Log
19th Jun 2010, 14:48
Replies: 154
Views: 39,880
Posted By PBL

Why, I wonder, didn't someone like BOAC pick up...

Why, I wonder, didn't someone like BOAC pick up on this?



That is so wrong. It must be corrected.

The angle of attack at which a modern commercial jet stalls at 0.8M is something around half...
Forum: Tech Log
16th Jun 2010, 15:29
Replies: 154
Views: 39,880
Posted By PBL

Guiones, I don't participate in these forums...

Guiones,

I don't participate in these forums to engage in silly word games. I participate to engage in discussion about matters of mutual interest in aeronautics. So one last word from me on this...
Forum: Tech Log
16th Jun 2010, 09:32
Replies: 154
Views: 39,880
Posted By PBL

Oh, dear, here we go again. Guiones, the...

Oh, dear, here we go again.

Guiones, the advice I give to most people who are tempted to think I contradict myself is that it is most likely to be a clear indication to themselves that they have...
Forum: Tech Log
14th Jun 2010, 03:24
Replies: 154
Views: 39,880
Posted By PBL

Giuones and others, I seem to have trouble...

Giuones and others,

I seem to have trouble explaining myself and getting my points across. Since my career is partly based on explaining myself and getting my points across, I find this situation...
Forum: Tech Log
13th Jun 2010, 18:11
Replies: 154
Views: 39,880
Posted By PBL

I find it hard to believe that anyone with an...

I find it hard to believe that anyone with an understanding of aerodynamics would disagree with anything I said, but it seems to have happened. Sorry.

If there is a pusher, the pusher will kick in...
Forum: Tech Log
13th Jun 2010, 11:29
Replies: 154
Views: 39,880
Posted By PBL

Yes, let's indeed not confuse stall with approach...

Yes, let's indeed not confuse stall with approach to stall. Here is an example of such confusion:


If you have a stick pusher on your airplane, then you are doing approach-to-stall recovery,...
Forum: Tech Log
12th Jun 2010, 17:05
Replies: 154
Views: 39,880
Posted By PBL

I don't think that is quite what is going on. I...

I don't think that is quite what is going on. I take it you are speaking of an unaccelerated stall, at Vs1g. C_L increases right up to the stall break, but after a certain AoA it is likely that it...
Showing results 1 to 25 of 25


 
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