1. Leifer

    Leifer Senior Member

    Here is a recent eBay purchase of mine, showing contrails from a 1951 USAF book/pamphlet.
    It describes using "vapor trails" (contrails) as a means to help determine aircraft type.

    (I have two videos back-to-back, one with reading the text, one without reading text.)

     
    Last edited: Jun 26, 2015
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  2. Mick West

    Mick West Administrator Staff Member

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  3. Leifer

    Leifer Senior Member

    1951013.

    1951012.

    1951016.

    1951015.

    1951017.

    1951014.

    regarding pic #5....it's likely this is not from one photograph, and is perhaps a montage of 3 photographs , melded together......in order to gather an overall idea. That is my hunch.
     
    Last edited: Jun 26, 2015
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