Mailing List flyrotary@lancaironline.net Message #9578
From: Marvin Kaye <marv@lancaironline.net>
Subject: Re: [FlyRotary] Re: Trail and error and error
Date: Thu, 08 Jul 2004 19:32:22 -0400
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
"John Slade" <sladerj@bellsouth.net> wrote:

"
the amount of pressure involved, solid AL tubing is preferred,
and the blue hose is braided silicone
 Marv. I used the same stuff, but it blew off a couple of times with the
 boost pressure. I learned that you need a rib around the end of the pipe and
 the clamp needs to be flat and clear of the rib."

I agree.  All of our intercooler connecting tubes are ribbed, as are the compressors and the I/C's themselves.  The tube between the compressor and I/C on the right side of the Eagle install needed to be shortened, so we welded the tube directly to the I/C, and rather than try to form a bead for the compressor side, we tigged one on and then smoothed it with a dremel.   It's all worked well in ground runs thus far, but we've yet to run it up to full power.  (At 2500rpm and about 20"MAP we were making enough wind with that Aero Composites prop to completely rearrange the interior of the neighbor's garage.)

  
" What's that orange tube coming out of the bottom of the intercooler? "

That's the hot side bleed air for cabin pressurization, goes directly to the air mix box that's mounted on the firewall   There are also sonic nozzles (what the orange scat hooks to) on the outfeed tubes of the I/C's for pressurized cool air.  They go from there to the 3rd I/C and then to the air mix box. (It feeds the cabin with about 5psi differential pressure and provides for an 8kft cabin at about FL250.  You can see the 3rd I/C (mounted above the gearbox) and the air mix box (sorta... it's in there <G>... on the firewall) in the attached photos.  Inside the cabin the output from the mixer box goes through a flap valve that directs the air either to the defrosters or floor vents or both.

     <Marv>

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