Hi Mark,

    I saw that a while back on the web.  Certainly looked interesting (but
heavy and expensive to make).  Also, while I am not absolutely certain about
this. It seems from what I have read,  most of these type variable manifolds
are based on the "Organ Pipe" or "Helmholtz Resonator" theories or some
combination/mix.  The things they have in common is the resonance effect
from a tube "tuned" to a selected frequency.  Said resonance effect
promoting air flow when engine operating RPM is on the "resonance".

The type below change the place the "resonance" effect takes place so that
they can continously vary it to match the operating RPM.  They basically do
this by varying the "effective length" of the intake tubes.  However, the
EDDIE is not based on any resonant effect.  About the only thing I see the
two having in common is the speed of sound.

That is not to say that such a variable intake would not be useful as part
of a basic induction system to promote airflow at different rpms, its just
not the EDDIE. IMHO

Ed Anderson
----- Original Message -----
From: "Mark Steitle" <msteitle@mail.utexas.edu>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Sent: Wednesday, September 24, 2003 2:25 PM
Subject: [FlyRotary] Re: DIE the short Answer


>
> >
> >What we really need is two telescopic tubes which slide into each other
with
> >O rings for a seal. The mechanism would be somewhat like a trombone for
> >similar reasons, but it would have to be accurately machined.
> >
> >John
>
> Or, how about copying BMW's design?
>
> Mark S.


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