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I may have come up with a scientific angle for debunking the assertion that contrails are a natural phenomena.
The photographic evidence show that the contrails are forming no more than 1/10 of a second behind the engines...
... which I'm hoping is long before the exhaust has a chance to cool and condense.
A picture appearing in a special report on Aircraft Emissions in the June 10th-16th issue of The Economist shows contrails forming quickly enough to obscure the tail of the aircraft presumably traveling at hundreds of miles per hour.
Unfortunately, all employed aeronautical engineers who could give actual measurements of exhaust temperatures have signed nondisclosure agreements similar to the commercial aircraft pilots...
A first course in fluid dynamics should give a first approximation which any third-year engineering student could calculate.
Originally posted by On the radar
Fake Contrails
I may have come up with a scientific angle for debunking the assertion that contrails are a natural phenomena.
Originally posted by Off_The_Street
I am an engineer for The Integrated Defense Systems of The Boeing Company; there are no "non-disclosure agreements" I have ever signed, although we are constrained from discussing either classified or company proprietary information. However, as one of our colleagues pointed out, there is nothing proprietary about basic engineering data regarding enthalpy.
Sometimes contrails will actually take on the characteristics of a natural cirrus cloud and no longer look like contrails after only a half hour or so. Persistent contrails can exist long after the airplane that made them has left the area. They can last for a few minutes or longer than a day. However, because they form at high altitudes where the winds are usually very strong, they will often move away from the area where they were born. When we look up into the sky, we may see old persistent contrails that formed somewhere else but moved overhead because of the wind. An example of several very persistent contrails is shown in the S'COOL cloud chart. Persistent contrails are those most likely to affect climate.