Can you help?

FIRE

My father has for many years asked me about the planes that travel over his house in Raheny.

I got a pic today and after finding this forum, I told him I'd ask here.

Basically, what he wants to know is.....

1) Are they commercial flights or something else that fly over using vapour.
2) Why do they use this vapour?



The picture might explain it better. All these flights were going either East to West or West to East, and flying on the same flight path as the planes coming into dublin Airport.

Appreciate any help.

kleefarr

Contrail

FIRE

kleefarr wrote: »

Contrail

Many thanks for that link kleefarr.

Foggy43

FIRE wrote: »

1) Are they commercial flights or something else that fly over using vapour.
2) Why do they use this vapour?

1. They are mostly commercial flights and may even a few military flights can also pass over.
2. That trail is the result of hot exhaust gas hitting extremly cold air. Also some oil added. The GE90's on the B777's will loose 12 pints of engine lubricating oil on a Heathrow New York flight. The Rolls Royce Trent, also on the B777 will loose none.

*Kol*

I would doubt the oil has any effect on the contrail? Not at that quantity anyway. That's only 6 cans of oil over the whole flight.

kleefarr

FIRE wrote: »

Many thanks for that link kleefarr.

Your welcome.

Guill

Thats fine, only 6 cans of oil, phew. Very comfotring to know.

*Kol*

Guill wrote: »

Thats fine, only 6 cans of oil, phew. Very comfotring to know.

Lol. I dont know the tank capacity of the GE90 (Foggy will probably know). I would say its at least 25 to 30 cans from empty to fill it so using 6 on a flight is not a huge issue. It's enough to be putting in after every flight though. It must be a GE90 thing. As Foggy said it would be more likely that no oil or maybe 1 or 2 cans would be needed after a flight of that length for other engine types.

View Profile

I was told that most jet engines can run perfectly well for hours without any engine oil.

Obviously a different case for piston engine's.

*Kol*

View Profile wrote: »

I was told that most jet engines can run perfectly well for hours without any engine oil.

Obviously a different case for piston engine's.

They will run with no oil but only once, after that it would be a very expensive shop visit to tear the engine down to replace all the bearings. I would say that the engine may not run for hours without oil as the temperatures involved in the hot section would probably cause the bearings in that area to fail without lubrication.

FOGOFUNK

*Kol* wrote: »

They will run with no oil but only once, after that it would be a very expensive shop visit to tear the engine down to replace all the bearings. I would say that the engine may not run for hours without oil as the temperatures involved in the hot section would probably cause the bearings in that area to fail without lubrication.

Even without ignition, the engines can only windmill for about an hour in a flight before needing bearing replacements.

On JT9D's anyway.

Davy

Was a thread after a thing on the gerry ryan show about something similar.
http://www.boards.ie/vbulletin/showthread.php?t=2055564065

https://www.youtube.com/watch?v=I2sZiYY9QA8

FIRE

Davy wrote: »

Was a thread after a thing on the gerry ryan show about something similar.
http://www.boards.ie/vbulletin/showthread.php?t=2055564065

https://www.youtube.com/watch?v=I2sZiYY9QA8

Thanks for that Davy, thats very interesting. He was asking me why they were criss-crossing.

Delta Kilo

FIRE wrote: »

Thanks for that Davy, thats very interesting. He was asking me why they were criss-crossing. My brother is into conspiracy theories, I'll ask him has he heard anything.

Ah please dont start a debate on chemtrails and conspiracy theories...its so old and silly at this stage. Have a look at www.flyinginireland.com and you'll get any answers you need.

FIRE

Delta Kilo wrote: »

Ah please dont start a debate on chemtrails and conspiracy theories...its so old and silly at this stage. Have a look at www.flyinginireland.com and you'll get any answers you need.

No. As you can see my original post is just an innocent question. I didnt know anything about those chemtrails.

Im not trying to discuss them, just the answer from Davy was interesting and from that video they mentioned Conspiracy theories.

I have the answer for my father what they are and anything else about chemtrails will NOT be discussed on here by me anyway.

Steyr

FIRE wrote: »

He was asking me why they were criss-crossing.

Because the Aircraft are at different altitudes and going in different directions, there are alot of Airports/destinations in the world to land at.:cool:

Danbo!

Conspiracy theorists, look away now!!



Taken from Flickr... More here

diverdriver

Good:D Aerial noughts and crosses. The crosses win!

fabbydabby

This topic was addressed and fully explained by aviation enthusiasts, private and commerical pilots on flyinginireland:

http://www.flyinginirelandmagazine.com/forum/viewtopic.php?t=4082&start=0

FIRE

Steyr wrote: »

Because the Aircraft are at different altitudes and going in different directions, there are alot of Airports/destinations in the world to land at.:cool:

Nah...... he was thinking along the lines of the Red Arrows I did my best to explain about the Airports/destinations in the world.

Foggy43

Stee wrote: »

Conspiracy theorists, look away now!!



Taken from Flickr... More here

But...but....but...my gandmother told me it was Santa Claus and his helpers watching us making sure we were very good and earn our presents at Christmas :eek: