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What Atmospheric Conditions Cause This?  
User currently offlineZSOFN From United Kingdom, joined Jun 2005, 1413 posts, RR: 5
Posted (10 months 3 weeks 1 day 8 hours ago) and read 2958 times:

Hi all,

I landed in Munich on SQ327 last week (77W) and noticed a large amount of water vapour being generated over the wings on final approach:

http://www.youtube.com/watch?v=ReJOhVv4N6U

I've noticed this before particularly on videos of landings at ZRH and AMS, so I was wondering if there was a particular temperature or humidity range in the atmosphere in that causes this?

N.B. Ignore some of the rather inane chatter between my friends & I during the video..!

4 replies: All unread, jump to last
 
User currently offlineairbuster From Netherlands, joined Mar 2007, 443 posts, RR: 0
Reply 1, posted (10 months 3 weeks 1 day 8 hours ago) and read 2934 times:

What i believe happens is that with very moist/damp air being accelerated over the wing the temperature drops and cold air can hold less moisture than hot air, therefore you see a release of moisture over the wing.

Something like that.



FLY FOKKER JET LINE!
User currently offlineoly720man From United Kingdom, joined May 2004, 6729 posts, RR: 11
Reply 2, posted (10 months 3 weeks 1 day 7 hours ago) and read 2898 times:

What you see is the expansion of the air as it accelerates over the wing. As it expands the temperature decreases and if the temperature is reduced sufficiently, to the dew point or below, any water vapour in the air will condense and you'll see it as clouds over the wing.

When this happens will depend on the speed of the aircraft, the size of the aircraft (to some extent) and any manoeuvre g loading as well as atmospheric conditions.

Go fast enough


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Photo © Stuart Freer - Touchdown-aviation



Humidity and the dew point temperature relative to ambient temperature are the main atmospheric factors, though.

Judging by this, people are looking for a definitive answer.

http://www.aviationplatform.com/surv...ect%20over-wing%20condensation.pdf



wheat and dairy can screw up your brain
User currently onlinenomadd22 From United States of America, joined Feb 2008, 1864 posts, RR: 0
Reply 3, posted (10 months 3 weeks 1 day 7 hours ago) and read 2897 times:

Quoting airbuster (Reply 1):
What i believe happens is that with very moist/damp air being accelerated over the wing the temperature drops and cold air can hold less moisture than hot air, therefore you see a release of moisture over the wing.

Something like that.

You get less that ambient temperature and pressure on top of the wings so air at close to 100% humidity can't hold the water anymore.



Andy Goetsch
User currently offlineZSOFN From United Kingdom, joined Jun 2005, 1413 posts, RR: 5
Reply 4, posted (10 months 3 weeks 9 hours ago) and read 2460 times:

Quoting oly720man (Reply 2):
Humidity and the dew point temperature relative to ambient temperature are the main atmospheric factors, though.

Perfect - thanks! I knew the theory of why condensation occurs but I think that's the key piece of info above. Wasn't necessarily looking for exact ambient temperatures etc necessarily.


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