Ok, I hate to sound dumb here, but this chart is way over my  head. I'm
    sure it provides everything I need to know, but I don't know what
    questions to ask of the chart. To start, is there a problem  with the
    displacement shown on the turbo spreadsheet? The spreadsheet  says that
    the 13B displacement is 159.6 cubic inches. That sounds way to
    high. I
    looked up the displacement in "cubic centimeters" and converted  it:
    13B = 1308 cc = 79.788 cubic inches
    20B = 1962 cc = 119.682 cubic inches

    I'm in Dallas and do most of my flying in 90-100 degree F. My  field
    altitude is 600ft. I usually fly under 15k altitude. I just  want to
    know how to select a turbo that will help me maintain 350 hp up  to about
    18k altitude on those hotter that hell Texas Summer days. Can  anyone
    give me the "Cliff Notes" or "Turbos for Dummies" version
    Don

    No Don it is indeed 159 c.i. equivalent. The three rotor is 240  c.i.
    roughly. That is how much air they pump in one rev at 100% VE. I
    am not sure which spread sheet you are looking at but it is  probably
    Dave Leonard's. Can you help Don out Dave?

    You will also need that Turbochargers book Don. I hope you save
    messages :)

    Paul Lamar


    Eh yeah, Im not going there... that is too close to the old "is  it a
    4-piston, 6-piston, or 2-piston equivalent?" :-)

    Lets just use 159 c.i. and leave it at that :-)

    (ok, each chamber is used once per rev instead of once every  other rev
    like in a typical piston engine... so double the equivalent  volume)

    --

    David Leonard

    Turbo Rotary RV-6 N4VY
    N4VY.RotaryRoster.net
    www.RotaryRoster.net
    leonardiniraq.blogspot.com

    So you went there after all :)

    Paul Lamar ...No rotor no motor.


    Okay,

    I'm going to chip in here as well. I use the actual  displacement in
    my spreadsheet, 80 ci (1300cc) for the 2 rotor, 120 ci for the
    3-rotor etc.

    Of course, with the rotary there is one combustion event per rotor
    for each 360 degrees rotation of the engine shaft, which is double
    that of a piston engine. So the effective displacement is double.

    Regards,

    Gordon.

I am going to have to add a section to my web site on this subject.
It keeps turning up like a bad penny :)

Here is what Ansdale said about it and he did not obviously put it
to bed back in 1969 :)

Paul Lamar

Yeah, I was just struck by a moment of melancholy when I realized
that Vance wasn't the one spearheading the objections..... He's missed.

Chris Cosman

Yes. Vance died unconvinced.

Here is my latest Ansdale patch work on the issue.