For the three decades prior to the year Cagiva bought Ducati and decided to focus almost exclusively on the V-twin layout, the company also produced a variety of singles and parallel twins. Read about the abandoned Ducati prototype engines, here.
Nothing, just a guy with a HUGE screwcompressor. They are commonly used to replace piston compressors where large volumes of high pressure air are needed. You will find these big boys mostly in industrial applications.