Item 1277
DESIGN: UniCopter ~
Pusher Prop - Type - Ducted Fan
Notes:
This involves a small diameter and high velocity device that is located very close behind the fuselage. It is therefor not a valid choice.
"The ducted propeller, though less efficient then the open propeller, is selected for the attack aircraft for reduced external noise and better protection from trees and wires when operating nap-of-earth." ~ from ABC Development Status and Design Considerations for Several Military Applications.
My thinking is that the duct may play a roll in the UniCopter's rear supports, as well.
Outside Web Sites:
http://www89.pair.com/techinfo/MassFlow/App.pdf
Ducted-Fan Engine Acoustic Predictions Using a Navier-Stokes Code, , June 1998, -> http://techreports.larc.nasa.gov/ltrs/PDF/1998/jp/NASA-98-jsv-clr.pdf
http://www.cds.caltech.edu/~milam/research/dfan/df.htm
http://www.cds.caltech.edu/courses/2001-2002/cds110b/lecture/cds110b-lecture3.pdf
http://www.kulikovair.com/k965/page3.htm
http://halfdome.arc.nasa.gov/publications/files/Abrego2_AHS02.pdf Have printout.
http://rotorcraft.arc.nasa.gov/publications/files/Abrego2_AHS02.pdf Have hard copy.
The Ducted Propeller for STOL Airplanes
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Last Revised: November 26, 2008