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发表于 2013-8-19 06:39:32
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Airplanes leaving a trail of smoke......?
Sometimes, airplanes leave a trail of smoke on the sky, usually at a great height. My Question is, what sort of planes are they, any usual passenger jetliner or some other type of planes? Can someone tell me, and better so, provide photographs of such planes so that I can identify it later.
Best Answer - Chosen by Asker
What you are seeing is not smoke. It is a contrail as was said earlier. It is formed because the compressors in the jet engine compress a lot of air volume into an small chamber and the water vaper gets compressed into drops of water that are shot out of the back of the engine. The reason you see it at high altitueds is because the temp up there is around -40, those drops of water/vapor freeze instantly and form a cloud that you see witch is reall thousands of water particles frozen. And to answer the other part only jet engines can do this because they have compressors, props do not so they cant make contrails. So if you are flying in a jet when the temp is a lot below freezing you will have a contrail. In some parts of alaska and siberia. The temp is already -20 and when planes take off they leave a contrail right there on the ground. I saw some videos of it its pretty cool.
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airline pilot in training |
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楼主: moonbay
IP卡
狗仔卡
发表于 2013-8-19 01:51:05
显身卡
他可以约，我可以接受，也可以拒绝。你猜，老满该如何应对？ 
发表于 2013-8-19 03:59:25
