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Message
Right on, Rusty! In fact after some
research I discovered one reason why the intake manifold I just replaced (which
had tubes inside tubes ala the slide trombone) did not work well. You could
adjust it - with a hammer {:>). I always thought that extruded tubing
was the most dimensionally precise - that would be like the 6061 (which is what
I had used). It turns out - NOT SO!. Drawn Tubing is the most
dimensionally precise (of any tubing commonly available). It turns out
that is 6063-T382 tubing commonly used in making telescoping antennas,
etc.
Then it becomes a challenge to come up with an
alignment method that keeps the upper and lower part of the tubes fairly
precisedly aligned. Otherwise, just the slightest bit of "cocking" will
jam the tubes. I had been working on a 4 tube inflight adjustable intake
manifold, when after much work and frustration(there, there's that word again),
just had to admit it was unlikely to ever work (for long) in the under the cowl
environment. Perhaps with a real machine shop instead of one with a
old Sears lathe and chinese drill press, I could have done it (thats about to
change - getting a real metal working mill/lathe), but, I decided to put that on
the junk heap and try something different.
In any case, the EDDIE study indicated that for my
system that combining the primary and secondary runners after they exit the
block not only would probably not hurt things, it might help. Well, it
certainly simplified the tube alignment problem and we will see about its affect
(if any) on performance.
Ed Anderson
----- Original Message -----
Sent: Wednesday, September 24, 2003 11:48
AM
Subject: [FlyRotary] Re: DIE the short
Answer
We somehow have to keep the lower pressure in the manifold (at
idle for
example) from sucking the rubber tubes closed. So the
concept is ..err great, err, but needs some more work on the
details{:>)
Two words- slide
trombone :-)
Rusty (I'll just turn up the
boost)
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