Perry Mick wrote:

Paul:

I've reached a point where we can look at some real world data to see
how (in)efficient my ducted fan is.  If I'm using a normally aspriated
13B turning 5200 RPM to go 125 knots, how fast does George go in his
Eracer when he throttles back to 5200 RPM?  That would be an interesting
comparison.  I'm sure he's still going faster than 125 knots at that
point.  Also, I don't think I have the optimum prop/duct combo yet.
I also don't have the optimum prop/duct combo to get the maximum
potential out of the NA 13B (6000-6500 RPM).

--
Perry J. Mick
Mick Duckt N7XR
http://www.mickaircraft.com/duckt.htm

You are between a rock and a hard spot Perry. As you up the RPM 
the the tips go faster and the duct eff. goes down.
Your only salvation is make that fan out of titanium and let it
go supersonic.
 
Paul Lamar
 
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