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:

There is a gap though, it's just very short, like this:

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:

There is a gap though, it's just very short, like this:

Plus the video is shot from a bit of an angle (nose to tail), so it looks even shorter.
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