(http://www.moodurian.com/tornado/images/gamemanualcover.png)
The Tornado 332-page game manual (English) PDF is available online at http://vogonsdrivers.com/getfile.php?fileid=1509
Digital Integration's Tornado manual is considered a classic among flight simulator manuals. It was written by the late David Marshall and Nick Mascall. A softcopy PDF manual is a poor substitute for the real thing that you can read until it dog-ears. To get the real deal, you can try Amazon (https://www.amazon.ca/Tornado-Flight-Manual-Spectrum-HoloByte/dp/B002EIFFJW).
There are actually two versions of the Tornado manual. The original version is published by Digital Integration (above image). The second version is published by Spectrum Holobyte.
(http://www.moodurian.com/tornado/images/SpectrumHolobyteTornadoManualCover.JPG)