Mailing List flyrotary@lancaironline.net Message #20332
From: George Lendich <lendich@optusnet.com.au>
Subject: Inlet plenum
Date: Sun, 17 Apr 2005 11:25:33 +1000
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
To All,
I have been thinking about the problems with getting a bent tube fitting close enough to the engine for an over engine installation on the inlet manifold.
 
My solution was to use a laser cut shaped bend, from flat material and have a square OR rectangular tube. The top and bottom being flat material is easily bent to fit the laser cut material. I figured this to be the best next thing to a perfectly fitting tube - more area as well.
 
Next I thought about a plenum and thought how a box shaped plenum would do.
 
Then I thought if I'm having a box why not build the square shaped tubing into the internals of the box. I ended up with a Box with an approx size of 6"x8" with a passage measuring ( centreline) approx 16.5".
 
As we're looking for a tuned intake between 18" to 21", I figure I'm not far off the mark and a small straight tube ( square or round) running from the box containing the butterflies and injectors, would make up the difference.
 
So what do you chaps think about this arrangement - does it have some merit OR are there problems I'm not seeing.
 
George ( down under)
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