Quote:
Originally posted by Seahawk
In helicopters, they have addressed, as you correctly named (I did not), "blade tip vortices" with ducted tail rotors...sometimes called a finistron.
The interesting aspect to me is that finistrons are in line with the direction of the vehicle. The propeller in the link
is not. For every ring or hoop (shroud), there is an added drag coefficient that might impact the props benefits.
I wish I understood German!
Thanks again for the post.
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I think the only application for the "Fenestron", from Latin from fenestra, window, is in the French
Aerospatiale/Eurocopter
365 Dauphine used by the Coast Guard.
http://www.shastalake.com/images/boatingsafety/coastguard-009.jpg