> Interesting page, Where can I get more information on using rotary
 > engines in aircraft and cars. I am building a lotus 7 replica that I
 > want to have 500 reliable hp out of. Also I am building an aircraft
 > that I want to create as a ducted fan aircraft. This takes lots of HP.
 >
 > DB
 >
 > 400 HP normally aspirated is no problem for a 3 rotor at 10,000 RPM.
 >
 > 400 HP turbo charged is no problem for a 2 rotor but everything
 > must be right as it is more sensitive to mixture and boost.
 >
 > Ducted fans are horribly inefficient in the 100 to 200 MPH speed range.
 > My guess on top speed with 400 HP would be well under 200 MPH.
 > Of course there would be lots of fuel burn on the order of 200 pounds
 > per hour or 32 gallons an hour. Those that have tried have gone back to
 > props.
 >
 > Paul Lamar

 Thanks for the data.  Yes I agree with the problems of the duct fan.
But there has got to be a way to make that work.  The jets do it and
with enough power a piston engine could too.  (my thoughts)  perhaps a
better thing to do would ba a shrouded fan similar to the RFB Fantrainer.

David

The way to get it to work is increase the cube root of power to drag ratio to the point where you are going 450 MPH or above. Then the ducted fan is the best option as it is on airliners. Airliners have an enormous amount of power.
In the range of several hundred thousand HP. 2,000 pounds of thrust for
a one engine biz jet at 500 MPH or 590 FPS is  about 1,200,000 ft pound seconds
or about 2,000 HP. 550 ft pound seconds is one HP. It will take a couple of turbo charged 1000 HP four rotor engines. The cooling system and fuel burn
would be enormous.

The Fan Trainer had the same problems.

Paul Lamar