Massive screw compressor.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...y_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...or_cutaway.jpg
Previously:
https://www.homemadetools.net/forum/...247#post138544
https://www.homemadetools.net/forum/...244#post141921
