Ducted Fan

Ducted+Fan
A ducted fan RC Vehicle ? ?

When using a ducted fan method to get trust, if you make the inlet of the air as big as the propeller and the outlet of air smaller, would you have more trust? Or if you made the inlet smaller .. vice versa? Or is it best to just leave it both inlet/outlet the same size?
Thanks,

You generally have the inlet larger than the outlet, and approximately the same size as the largest compressor fan blade diameter -- or a bit larger.

That's the way I have seen *every* design of a ducted fan -- from airplane fanjets to this thing:

http://www.moller.com/

.

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