Just added a new post to contrailscience.com:
http://contrailscience.com/how-big-is-the-gap-between-contrails-and-engines/
It was inspired by a YouTube message exchange from Harold Saive, in which he indicated he though this video was proof of spraying, becaue there was no visible gap between the engines and the contrails:
This was the most "no gap" it gets:
![](https://www.metabunk.org/data/MetaMirrorCache/contrailscience.com_skitch_Stunning_Video_of_Commercial_Aircra7e28607123aa4e2c7033e0034d89c6b3.jpg)
There is a gap though, it's just very short, like this:
![](https://www.metabunk.org/data/MetaMirrorCache/contrailscience.com_skitch_Short_Gap_20120929_135631.jpg)
Plus the video is shot from a bit of an angle (nose to tail), so it looks even shorter.
http://contrailscience.com/how-big-is-the-gap-between-contrails-and-engines/
It was inspired by a YouTube message exchange from Harold Saive, in which he indicated he though this video was proof of spraying, becaue there was no visible gap between the engines and the contrails:
This was the most "no gap" it gets:
![](https://www.metabunk.org/data/MetaMirrorCache/contrailscience.com_skitch_Stunning_Video_of_Commercial_Aircra7e28607123aa4e2c7033e0034d89c6b3.jpg)
There is a gap though, it's just very short, like this:
![](https://www.metabunk.org/data/MetaMirrorCache/contrailscience.com_skitch_Short_Gap_20120929_135631.jpg)
Plus the video is shot from a bit of an angle (nose to tail), so it looks even shorter.
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