Airimages
Topic Author
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Disturbence In A Contrail?

Wed Jul 05, 2006 3:54 am

Hi all,

I just got a mail from somebody who wanted to know something about this pic:


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Click here for bigger photo!

Photo © Jerome Zbinden



"I realised that there was some disturbence caused to the contrails of the top middle group. Can you perhaps explain if you know what caused it."

Unfortunately I don't know it but maybe somebody of you.

Thanks for your help!

Cheers,

Jerome
 
Morvious
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 4:01 am

Looks like the blur tool or something similiar, strange though!
have a good day, Stefan van Hierden
 
jetmatt777
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 4:04 am

If it was an airshow I doubt those would be contrails, more like airshow dust, since this is powder/dust even the slightest amount of wind would cause a disturbance

Just my  twocents 
-Matt  Smile
Lighten up while you still can, don't even try to understand, just find a place to make your stand and take it easy
 
Airimages
Topic Author
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 4:08 am

Yes true, it's not a contrail  Smile
 
Morvious
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 4:13 am

That was not what he was asking for guys =)!!
have a good day, Stefan van Hierden
 
Airimages
Topic Author
Posts: 101
Joined: Tue Feb 01, 2005 8:13 am

RE: Disturbence In A Contrail?

Wed Jul 05, 2006 4:27 am

But this is maybe the answer  Smile

"since this is powder/dust even the slightest amount of wind would cause a disturbance"
 
JeffM
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 5:29 am

Quoting Jetmatt777 (Reply 2):
more like airshow dust,

LOL.....what is "Airshow" dust?
 
jamesbuk
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 5:33 am

Quoting JeffM (Reply 6):
"Airshow" dust?

the smoke that most display teams pour out of the back of the aircrafts.


fool

Rgds --James--
You cant have your cake and eat it... What the hells the point in having it then!!!
 
Gary2880
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 6:03 am

for once i agree with Jeff. most teams say ''Smoke on'' not ''Dust on''  Wink

as for the blurr, no idea really. definatley isnt wind.

did you sneeze on the ccd possibly. almost looks like the kind of effect you may get while shooting through glass, was there maybe a smudge or something like that on your lens/filter that you can remember?

short of that, gawd knows.
Patriotism is the last refuge of the scoundrel :- Samuel Johnson
 
JeffM
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 7:51 am

Quoting Jamesbuk (Reply 7):
the smoke that most display teams pour out of the back of the aircrafts.


fool

Fool?

It's absolutely rediculous that anyone would think that is dust.
 
IngemarE
Posts: 281
Joined: Thu Mar 24, 2005 4:46 pm

RE: Disturbence In A Contrail?

Wed Jul 05, 2006 8:24 am

Quoting JeffM (Reply 9):
It's absolutely rediculous that anyone would think that is dust.

To you or me, or anyone really interested in aviation, it might seem a bit on the "rediculous" side. On the other hand, for those who are not all that "into" it, and that might have come across the term (for example) crop-dusting, it might make perfect sense.

Now, to the issue...
If we are discussing the "anomaly" in the smoke coming from Swedish Air Force's Team60, I would say it's some kind of optical problem. Might be the glass or something stuck on the sensor, but most likely an editing problem. Looks like a small rectangular-shaped piece of the pic has been cut-out and displaced. I've never seen any aerodynamical disturbance like that before and I believe it to be highly unlikely that only 4 of 6 aircrafts in a tight formation experiences a shear, or vortice residue, creating a "hump" like that.

Hmmmm....
Anyway, Good night folks! I'm off to bed!  zzz 
In thrust I trust.
 
eadster
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RE: Disturbence In A Contrail?

Wed Jul 05, 2006 9:09 am

Quoting JeffM (Reply 6):
LOL.....what is "Airshow" dust?

Exactly! I've never ever heard someone call it dust - I thought everyone knew it was smoke!

That from looking at it, is not an atmospheric effect, caused by turbulence, windshear, or just wind, as it would be evident on all trails from that formation.

So I'm guessing it is a fault in photo editing or a blemish on the lens used.

[Edited 2006-07-05 02:09:56]
 
jamesbuk
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RE: Disturbence In A Contrail?

Thu Jul 06, 2006 3:59 am

Quoting JeffM (Reply 9):
JeffM

Dude it was a light hearted joke, i guess you cant really get across jokes on the internet can ya?!?!

Ive heard a few people call it dust mainly smoke and also trails.

Rgds --James--

P.S. Its definitely a editing fault because the sky in the background of that area also looks similar (smudged)
You cant have your cake and eat it... What the hells the point in having it then!!!
 
Airimages
Topic Author
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RE: Disturbence In A Contrail?

Thu Jul 06, 2006 4:09 am

The smoke looks on the original photo like this and my lens should be ok, never seen something like that on other photos.

Regards,

Jerome
 
jetmatt777
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RE: Disturbence In A Contrail?

Thu Jul 06, 2006 6:47 am

Quoting JeffM (Reply 9):
It's absolutely rediculous that anyone would think that is dust



Quoting JeffM (Reply 6):
LOL.....what is "Airshow" dust?



Quoting jetmatt777 (Reply 2):
powder/dust

That should explain.

Quoting IngemarE (Reply 10):
To you or me, or anyone really interested in aviation, it might seem a bit on the "rediculous" side. On the other hand, for those who are not all that "into" it, and that might have come across the term (for example) crop-dusting, it might make perfect sense.

Don't worry Im interested in aviation. Im not a half way into aviation person. I spend all day on A.net or Flight Sim.  SmileAnd see below:

I called it powder/dust because it actually isn't smoke. Is it from a flame, its powder. The reason I called it powder/dust is because when you go to an airshow and a plane thats trailing "smoke" swoops low to the ground do you see the "smoke" rise? No. You see it slowly fall to the ground. I don't know of any smoke that goes down.

Quoting Gary2880 (Reply 8):
for once i agree with Jeff. most teams say ''Smoke on'' not ''Dust on''

Okay, is it smoke though? See above.

Hope that helps the confusion  Wink

-Matt  Smile
Lighten up while you still can, don't even try to understand, just find a place to make your stand and take it easy
 
IngemarE
Posts: 281
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RE: Disturbence In A Contrail?

Thu Jul 06, 2006 7:09 am

Quoting Jetmatt777 (Reply 14):
Don't worry Im interested in aviation. Im not a half way into aviation person. I spend all day on A.net or Flight Sim.

If I have offended you in any way; I'm sorry!

...and what is it exactly they use!? Well, I know for sure in most cases it used to be diesel, that was sprayed into the exhaust gases.
Not too long ago though, I was at an airshow where the speaker for the Breitling team "bragged" about them being the "enviromentaly friendly" display team, because they use parafin instead of the good ol' "diesel solution". It smelled like old(ish)-style candles.
In thrust I trust.
 
jetmatt777
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RE: Disturbence In A Contrail?

Thu Jul 06, 2006 7:17 am

Quoting IngemarE (Reply 15):
If I have offended you in any way; I'm sorry!

Nah. Don't sweat it.
Lighten up while you still can, don't even try to understand, just find a place to make your stand and take it easy
 
JeffM
Posts: 7569
Joined: Sat May 07, 2005 3:32 am

RE: Disturbence In A Contrail?

Thu Jul 06, 2006 8:16 am

Quoting Jetmatt777 (Reply 14):
Im not a half way into aviation person. I spend all day on A.net or Flight Sim.

Well, why didn't you say you were an expert!?!

...and by the way...it is smoke, not dust or powder.
 
jetmatt777
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RE: Disturbence In A Contrail?

Thu Jul 06, 2006 8:52 am

Quoting JeffM (Reply 17):
Well, why didn't you say you were an expert!?!

...and by the way...it is smoke, not dust or powder.

I'm sorry Jeff for having my own oppinion.
Lighten up while you still can, don't even try to understand, just find a place to make your stand and take it easy
 
JeffM
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Joined: Sat May 07, 2005 3:32 am

RE: Disturbence In A Contrail?

Thu Jul 06, 2006 9:36 am

Quoting Jetmatt777 (Reply 18):
I'm sorry Jeff for having my own oppinion.

No need to be sorry for having an opinion....I'm just telling you what the stuff actually is. There is a difference.

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