Great! Alex,  Sounds like you are familiar with the theories (and
complexities)  that appear to be the most suitable ( in my opinion).  I do
have a somewhat complex model of the Helmholtz that I adapted for the
rotary.  I also have my own analysis and derivation of the equations and
factors used by the Mazda engineers to implement their Dynamic Effect Intake
Supercharging effect for the NA 13Bs.

Rather than clutter up the list with stuff I have presented in the past,
I'll send you a brief summary of my mathematical analysis and derivation of
the equations off line.  Its only a couple of pages long.  The full
derivation runs past 20 pages (only for those that really want to abuse
themselves).

In the mean time I will see where I misplace the Helmholtz Spreadsheet.

Ed

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC
----- Original Message -----
From: "Alex Madsen" <madsena@rose-hulman.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, May 07, 2004 9:58 PM
Subject: [FlyRotary] Re: Intake manifold tuning


>
> I appreciate your concern. I am aware of the complexities of intake
> design such as Finite Amplitude Waves and the Inertia. What I am looking
> for is a starting point because all the lengths and diameters are
> interrelated in their effect on tuning.
>
>  I am specifically looking for the Helmholtz and Ohata model equations
> that have been adapted for the rotary. If on one has them then I will
> take the time to modify them from 4-stroke myself (I have the 4-stroke
> equations).
>
> Alex Madsen
>
>
>