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taketheredpill
"Contrail persistence is nothing new or abnormal - there is ample evidence of them in WW2, and some from before then."
If you cite evidence then it is normally customary to show it. Without proof of what you claim, it’s hearsay, the weakest form of proof there is. I know of photos out there too, but they are photos. You cannot claim that you know how high in the atmosphere these planes were. Was this evidence something you heard of one of your friends when you were discussing how you would debunk these “believers”? If this evidence is ample as you say, then add the links – show me what you are referring to so I can at least reply.
I’ll try to reply anyway. The first international all-jet passenger flight from London to Paris on 23 November 1946 ( that was able to fly at altitudes conducive to forming contrails – by the “official” atmospheric standards) was in 1946- a Avro Lancastrian, operated by BSAA.
taketheredpill
reply to post by network dude
No, I don't know about the changes to jet engines recently - I am a nurse. Could you enlighten me? Thanks.
According to a previously established thermodynamic theory, contrails are expected to form at a threshold
temperature that increases with the overall efficiency of the aircraft propulsion. As a consequence, aircraft with
modern engines, with higher overall efficiency, cause contrails over a larger range of cruise altitudes. To validate
this theory, an experiment was performed in which contrail formation was observed behind two different four engine
jet aircraft with different engines flying wing by wing. Photographs document the existence of an altitude
range in which the aircraft with high engine efficiency causes contrails whereas the other aircraft with lower
engine efficiency causes none. For overall efficiencies of 0.23 and 0.31 and an ambient temperature lapse rate of
12 K km¡ 1, the observed altitude difference is 80 m. This value would be larger (200m) in a standard atmosphere
with smaller temperature lapse rate (6.5K km¡ 1 ). In a standard atmosphere, an increase of overall efficiency from
0.3 to 0.5, which may be reached for future aircraft, would cause contrails at about 700 m lower altitude.
taketheredpill
"Contrail persistence is nothing new or abnormal - there is ample evidence of them in WW2, and some from before then."
If you cite evidence then it is normally customary to show it.
Without proof of what you claim, it’s hearsay, the weakest form of proof there is.
That would be different winds (potentially speed and direction) at different altitudes.
taketheredpill
reply to post by network dude
Sure - I concur with what you are saying. However, it is not possible for a contrail to stay, as if magnetised, in the sky while other clouds blow right through. How, on gods green earth, is that possible?
These videos were taken by myself. Notice how the trail cuts through the clouds.
Please explain if you can. I wonder if, in fact these are the result of the following patent - for whatever reason I do not know, one can only suspect.
Generation of magnetic fields
Did you not see that the clouds were both above and below the trail and that the clouds blew through the trail ? So are you telling me that for that tiny strip of sky, the wind was completely absent. Do you actually expect me to buy that? Come on, you seem like an intelligent person - that sounds utterley ridiculous.