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  A few days ago there was a discussion on hanger materials for exhaust
pipes.  The other day I had a chance to sneak around underneath a Cirrus
SR20 parked at our local airstrip.  I was interested in seeing how they hang
those extra-long pipes for their "tuned induction" exhaust.  The straight
portion that extends aft parallel to the belly sisbout three of my handspans
long, which is roughly 27".

   Nifty system:  They have a metal strap about an inch wide sticking out
of each side of the exhaust tunnel, and a strap welded around the bottom
half of the exhaust pipe.  The strap on the exhaust pipe has an ear sticking
out each side for about an inch.  Each strap has a hole in its end and the
straps and the pipe are connected with a spring on each side.  They've
apparently played with the spring rate to get the right balance of flex and
support.

   The same thing could be done on the ES (and other models, I suspect), by
simply bolting the support straps through the fuselage flange with
countersunk screws.  The cowling would then cover those screw heads.  I plan
to contact the parts department at Cirrus to see if I can buy the springs
from them.  Springs seem like a hard thing to find in just the right size,
length, and spring rate.  If I'm successful, I'll post the results.  This
seems like a better system than the reinforced rubber straps that have to be
bolted through the firewall.

Jim Cameron
ES builder

LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
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Please send your photos and drawings to marvkaye@olsusa.com.