Ducted Propellers and Ducted Fans

If you take a propeller and put it inside a duct you can get better performance. But why? And why don’t we see ducts on all propellers?

How ducting a propeller increases efficiency and thrust
The Segway of Airplanes (Hiller Flying Platform)
Will Ducting Your RC Props Increase Thrust?
Ducted Wind Turbine Doubles Performance at Clarkson University
DUUC aircraft with the innovative ‘Propulsive Empennage’ concept
Ducts – more thrust and efficiency?

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