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Vapour trail.
Posted: Sat Jul 15, 2006 9:09 pm
by oldherbaceous
I was taking a bit of advice from Submariner today, had an hour laying down in the shade of the oak tree over the allotment today. I was watching the swallows darting about catching flies, when i noticed the planes flying over at a fair few thousand feet up.
What i couldn't understand was why some of the planes had vapour trails and some hadn't, they looked the same height and seemed to be travelling at about the same speed.
I know the ones without vapour trails can't have electric motors, because they can't have exstension
leads that long, do they
If anybody knows the answer could you let us know.
Kind regards Old Herbaceous.
When i'm not fishing i'm mendig my nets.
Posted: Sun Jul 16, 2006 6:20 am
by Weed
Good morning OH
I always thought, rightly or wrongly, it was the planes that flew in the higher stratusphere that produced trails ....although they may look similar heights from down here I would say there is a signicant difference once you get up there
Anyway you are thinking too deeply
Posted: Sun Jul 16, 2006 6:23 am
by sandersj89
Posted: Sun Jul 16, 2006 7:20 am
by Carole B.
I think Weed is right,it's when they get up to the really cold stuff and moisture from the engines forms ice crystals which is ,I believe,what we see. Unless someone was pulling my leg many years ago.......
Posted: Sun Jul 16, 2006 8:48 am
by Geoff
What ever causes them there are far to many of them. I would put an internationally enforced 100% duty on aviation fuel and use the revenue to fund the United Nations. Most flights are unnecessary.
Posted: Sun Jul 16, 2006 9:54 am
by oldherbaceous
Thanks for the answers, i didn't think they could have exstension leads.
Weed your quite right about the deep thinking, i should leave that to someone else.
The swallows were far more interesting anyway.
Kind regards Old Herbaceous.
Theres no fool like an old fool.
Posted: Sun Jul 16, 2006 10:42 am
by Clive.
Always at least 8 or 9 vapour trails in the sky high above here heading East/West..over the top I assume, Stateside/Europe...sometimes including C5 Galaxy transports...which have a very characteristic whine to their engine note..
Somewhat lower...The 1942 Stearman biplane (G-AROY) that I was watching performing yesterday was good to see....
....Auster (G-ALFA) and 2 Spitfires (MK356 & MJ627)last weekend
Skylarks too...birdy type...not C175
Clive.