Tony

 Yes it is Tony but if you will reread what I said above it is
 working in a different speed range. Did you not read this message
 the first time around?
 It all boils down to this. If you have enough HP to go 600 MPH
 then by all means use a ducted fan. Damn the fuel burn full speed
 ahead. Top speed is the cube root of HP. If you have HP cubed
 go for it. Airliner turbo fans have gobs of HP. In the range
 50,000 and up. They also burn gobs of fuel.
 Here is a picture of a ducted fan turbo charged Mazda 3 rotor aircraft
 that was an abject failure. It has been sitting in a hangar in Ramona
 Ca for the last half dozen years. If a turbo charged 3 rotor won't make
 it work... what will? The guys that designed this are some of the
 top aviation engineers in the country.
 Just a little short on smarts however :) It failed after all.
 Those that fail to learn from history are doomed to repeat it.
 Paul Lamar

  Paul,
What Was the cause of the failure ? Just simply not enough thrust ??
David

Fan too large so engine could not rev to max HP. Needs a gear box.
Air friction in inlet duct. Drag of P-51 type air intake ducts.
Increased frontal area. NACA ducts don't work. Etc., etc..
Forget it. Use a prop and gear box :)
    Paul Lamar