Three rotors are getting very expensive but that would be the best
    for the Viking.
    The problem is the FAA will not approve it until Mistral gets the
    300 HP 3 rotor certified
    any day now.


    You can also do it your self and save a couple of thou. I recommend
    P-port engines
    which up the HP with no penalty in weight or fuel burn per HP generated.

    Paul Lamar ...No rotor no motor.


    The Viking will be an experimental I am using parts to build a new plane
    from scratch. I also have one that I am flying though.

    I will concentrate on the Cougar for now.

    I looked all over and do not know the difference or what makes an engine
    a P-Port.

    Either of these? 13B RESI, or 13B DEI.

    Dan


    Read this Dan.
    http://www.rotaryeng.net/intake.html

    Also here is a video on p-ports.
    http://www.youtube.com/watch?v=LkKw72dZ2yc

    Paul Lamar ...No rotor no motor.


OK now I am getting it. Using the picture below of the two P-Ports side
by side. The two on the left are stock (used with the sliding fuel
injection) the two on the right are modified with the SS pipes for a
carb application.

Dan


Correct Dan. Mazda made some p-port rotor housing for sale to the car racers.
Just about every Mazda engine in professional car racing uses p-ports.
Most recently an RX8 won the Daytona 24 hour using a p-port engine.
The engine used to win Lemans also had a p-port.

Here are some airplanes flying that also have P-ports.
The last RV4 airplane is similar to the airplane that Everett Hatch,
Steve Beckham and Allan Tolle used to set the all time record for time
to climb from a dead stop to 3,000 feet. It beat dozens of airplanes
from Warbirds to jets. It also went 238 MPH in the Sun 100 race.

Having said all that current stock RX8 engines are side ports to reduce
emissions and improve the low speed low power fuel consumption for car use.
The penalty, from the aircraft point of view, is less peak power and a very
complicated intake manifold.