My primary runners
are 0.049 6063 T832 Drawn alum 1 .25” in diameter. My secondary
runners are of the same tubing but 1.5” in diameter. Below is best
source for this Drawn aluminum tubing that I
found.
http://www.texastowers.com/aluminum_.htm
In my case I wanted
them adjustable by having the top half made of larger tubing – in fact I got
the special aluminum tubing used for telescoping antenna elements so the
bottom and top would slide together smoothly. If you don’t plan to
do that then 6061 T6 will work just fine.
I cut off the heavy
cast aluminum tubing of an 86 N/A upper manifold, milled a shallow recess
around the air hole, set the thin lightweight tubing down in it and brazed it
with HTS-2000 (the only aluminum brazing rod I’ve ever had any success
with). You could possibly tig weld it – but I had somebody try with a
Mig welder and the thin tube and heavy casting (manifold), just didn’t come
out well.
http://www.aluminumrepair.com/
Hope this was
helpful
Ed
From:
Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Rino
Sent: Sunday, October 04, 2009 12:21
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Intake
runners
Ed
could you please tell me the diameter of your intake runners, primary and
secondary.
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