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