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From: "Ian Dewhirst" <ianddsl@magma.ca>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Tracy's and Bruce's style intakes
Date: Tue, 10 May 2005 20:40:13 -0400
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Hi Rusty, I am working on much the same idea.  I am making it out of plastic
on a CNC milling machine - once I am happy I will redo the flanges and
injector holders in aluminium. I have the injectors firing into the air
horns, and I have a drain tube at the rear so that if the injectors leak the
fuel will go down the pipe and out of the bottom of the cowl.  I am making
the plenum as two parts with a long rectangular filter in the lower part and
the throttle body on the bottom.  From what I have seen when cost is not a
deciding factor auto makers / tuners tend to go favout air horns projecting
into an ample plenum as opposed to the "log" manifold.  With the injectors
pointing into the air horns low speed trottle response and idle is going to
be less then optimum however mid / high speed performance should be good. --
Ian


 -----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]On
Behalf Of Russell Duffy
Sent: Tuesday, May 10, 2005 8:15 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Tracy's and Bruce's style intakes


Greetings,

I guess I'm leaning toward building a new intake, and I'm thinking of
following what Tracy has done, which is also similar to the intake that
Bruce is selling.  This certainly seems like the easy way to go, especially
if I make it square like Tracy's.  Does anyone have any better pics of
either of these?   I've seen the pics on Tracy's page, and also the one that
I think Bob White posted to the list.

At first, it would seem wrong to make this square, but since Tracy used air
horns inside the box, that seems to make it OK to me.  The box itself is
just a big plenum, or reservoir of air, so if it's big enough, I'm guessing
the shape doesn't matter that much.

Bruce's, seems to be more conservatively sized.  The main "log" portion is
about the sized of the TB, and the pipes go off the rounded body of the
intake.  If I'm not mistaken, I've seen this sort of shape on intakes for
cars in the past, so it must work OK.

One thought that comes to mind is to make the intake body like Tracy's, but
with the injectors inside the box, pointing into the intake tubes, ala Jerry
Hey.  It would be nice to have all the injectors contained in the box in
case one decides to leak.

Sorry for the rambling, just looking for ideas.

Cheers,
Rusty (single rotor on the way from the Ebay guy)