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From: "Eric Parlow" <ericparlow@hotmail.com>
To: lancair.list@olsusa.com
Subject: TCM-5
Date: Thu, 19 Oct 2000 16:39:51 GMT
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Jim,
Q--  I, too, am interested in when the FADEC will be ready for the IO-550.  
For exptl use, we don't need certification, so .... ?
A-- FAA TC in six months.  We will not have the engine "MAP" complete until 
the certification testing is complete.  This mean sales for experimental use 
will follow the TC.

Q--How will the FADEC unit handle LOP operation,which is one of the nice 
features of the IO-550?
A--I will post a separate description of how FADEC will operate.  It is out 
of the manual and is LONG.

Q--I was pretty happy with my last one (ES #1), but I never did quite figure 
out the routine for jiggering the mixture in a long descent, with a flipover 
to ROP operation at some point down low.  I also wonder how the FADEC 
algorithms will be built to handle these sorts of things.
A-- The FADEC description should address this but bring out more questions!

Q--Anyway, I notice that Cirrus are using an extended exhaust pipe, which 
they claim gives a bit of a performance boost, and probably reduces cockpit 
noise, too.  Any thoughts on this?
A--The SR-20 (IO-360-ES) uses an extended exhaust pipe.  They also have a 
big muffler to complicate the issue.  They do see an improvement.
I question if it due due to "Tuning" and not the lower pressure where the 
exhaust exits.  No information on the noise.  I would expect it to be 
quieter also.

Q--Is TCM working on the exhaust end at all?
A--No, Most naturally aspirated exhaust are supplied by the airframer.  We 
do give backpressure limits.  I plan to test the final production exhaust 
for the SR-22 (IO-550-N7B) on the dyno.

ERic--

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