DENIS SMITH wrote:

I am really fascinated with the idea there might be an
application for a fan propulsion unit for my three
rotor.  I heard of a guy in Florida (Matt Kite?) who
was doing work on a turbine like fan.  It would be
interesting to see what kind of performance would be
available with a potential of 300hp+ turning a fan at
5000rpm!!  DP Smith

First you will be greatly disappointed with the HP at only 5000 RPM.
Two there is a huge tradeoff between low speed thrust and high 
speed thrust as Perry is slowly finding out. What you need is a geared
fan to get the performance up. You need to run the turbo 3R engine at 8000
RPM and the fan at 4000 RPM to get a reasonable amount of efficiency
as my first guess and IMHO. Plan on going at least 350 to 400 MPH to take 
advantage of the high speed eff. of a fan over a prop. 
You won't get as many miles per gallon as a prop plane but it will 
not be as bad as a pure turbo jet. On the other hand you should 
be going faster than a prop and a bit slower than a turbofan jet.

You will also need a very thin fan made from titanium to handle 
rain or carbon fiber with a metal leading edge. IMHO the tips of the 
fans should run at mach 1.2 or so. Count on a lot of differences 
of opinion on all of this. There is a turbo 3R ducted fan in Ramona 
that has flown.

As Perry says, he has been working on this for 13 years so far.

BTW Denis do you have Alturdyne or Paul Ross's phone number
and or address?

Paul Lamar
 
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