Jet donkey designed to allow aircraft to take off from short runways.
https://diqn32j8nouaz.cloudfront.net...y_fullsize.jpg
More:
https://books.google.com/books?id=KN8DAAAAMBAJ&pg=PA72
Previously:
https://www.homemadetools.net/forum/...684#post186272
https://www.homemadetools.net/forum/...778#post159811
https://www.homemadetools.net/forum/...026#post153229
https://www.homemadetools.net/forum/...466#post127716
https://www.homemadetools.net/forum/...019#post164566
