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Originally posted by Aloysius the Gaul
Those are actually pretty good pics for an "average" camera.
Regarding the one that looks like it is spraying from the tail - hot air coming out of the engines takes a while to cool and condense - that is why there is always a gap between the engines and the contrails they generate.
contails spread out and form clouds because the ice crystals they contain are good nucleation sites for other ice to form if the air is supersaturated - ie ice requires something to actually form on down to -42 deg C (ie at -42 water will spontaneously freeze without a nucleation site) - so without nucleation the atmosphere can actually contain a lot more moisture down to -42 than it can if there is nucleation - eg see the Wiki page on cloud physics - en.wikipedia.org... especially the section on supersaturation, and the Bergeron process
the difficulties of photographing a/c and guessing heights are covered on this page - if you know sufficient data about your camera you can use image size as a rough and ready guide to altitude.
Originally posted by weedwhacker
reply to post by gemineye
Those are all perfectly normal contrails and cirrus clouds.
What's the question??
You have excellent, good long-lens shots of airplanes as well....with the clear-cut signs of normal, everyday contrails forming in the engine exhaust, just as one expects to see, when the relative humidity and temperature are conducive to formation.
SO, again....what's the question here??
...but maybe you should put your glasses on ....
/...hey are coming directly out of something in the tail...
Originally posted by Aloysius the Gaul
reply to post by ParkerCramer
Well science often is quiet technical!! But I reckon the wiki articles I linked to are in reasonably plain language.
The reason that particular photo loks the way it does is probably nothing more than the angle you took the shot on - here's a great shot showing how such things can happen...poor stork!
Originally posted by ParkerCramer
I thought pilots were suppose to have 20/20 vision???
if you were of the mind, and if you haven't already done it, there are a couple of websites that let you see ATC screens, with most call signs, elevations, etc, in view.
Originally posted by ParkerCramer
Do you have any thoughts on the photos in this post??