Ducted fan
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In aeronautics, a ducted fan is a thrust-generating mechanical fan or propeller mounted within a cylindrical duct or shroud. Other terms include ducted propeller or shrouded propeller. When used in ve
Bell X-22
Dirigible airship with ducted fans
Avian Gyroplane with ducted pusher prop (but no tail-boom)
Ducted fan on an Air Cushion Landing Craft
Subsonic aircraft
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A subsonic aircraft is an aircraft with a maximum speed less than the speed of sound. The term technically describes an aircraft that flies below its critical Mach number, typically around Mach 0.8. A
Czech subsonic multi-role combat aircraft Aero L-159 ALCA.
A Spitfire built in 1945 shows off its straight elliptical wing