Ed;
I know you have posted this mathematical stuff before to this list, but
there are new members all the time, and some may not have been interested
when this was first posted, but they may have become more willing to follow
the math more closely.

Might I suggest a posting of the relevant files to a web site.  Easy to
reference and centralized , and the latest corrected version always
available are just a few advantages.

I am sure there are a bunch of us capable of hosting these files, but I will
go further to suggest as forum such as
www.canardaviation.com/fourm
you could post the files in a thread there, or if you would prefer a new
forum could be created.  It would be easy to reference and you can edit an
attached file to the latest version at any time.

Please do not let the canard bias your decision.
We have no problem with those that choose to make their planes backward.  :)
Again, any host will due.  If I may be of assistance please ask.

----- Original Message -----
From: "Ed Anderson"
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Friday, May 07, 2004 11:13 PM
Subject: [FlyRotary] Re: Intake manifold tuning


> 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