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> From: Rob Logan <Rob@Logan.com>
> To: lancair.list@olsusa.com
> Subject: Aerosance's FADEC
> Message-ID: <3C3A28FA.304A98F@Logan.com>
>
> as a FADEC depositor I hafta speak up but yes, I'm bias too.
< SNIP >
> 4) software upgradable to 92UL or whatever when blue stuff is
> unavailable. (software is more adjustable than fixed mags :-)
> This is an important point if you wanta fly your plane 5 years
> from now. I would want them to work on the 92UL software
> anyway, as 92UL is still a moving target.
>
I am very excited about this FADEC stuff, and would like to keep
stirring the pot to air as much information about the system as
possible. I just decided on the IO-550 engine this week (rather than the
IO-540), even though I have been working on my Legacy for six months
now! I was finally forced into a decision bcecause Lancair is getting
ready to ship my motor mount and cowl.
The fact that the software is upgradeable opens up all kinds of
possibilities. As has been previously stated, the mixture settings for
LOP below 2300rpm and ROP above 2300 is a conservative design decision
made by Aerosance. I attended a seminar on Lycoming's EPIC fuel
injection at OSH this year. They actually set the mixture for LOP once
the computer has decided you are in cruise mode. Cruise mode is entered
when the MAP and RPMs have stabilized, and you haven't change the
throttle setting for 60 seconds. Additionally, they have a two-position
switch on the panel for economy and power modes of operation (the
computer overrides the switch when necessary to keep you from hurting
the engine).
Could some of these concepts be incorporated into the Aerosance system?
As a software engineer who works on embedded computer systems, I would
imagine that almost every aspect of this system's behavior could be
altered by simply modifying the software. Are these units field
upgradeable? Most modern computerized systems (like the Garmin 530) can
be hooked up to a serial cable and a new program flashed into
non-volatile memory to fix software bugs or add features. This is
actually a benefit for the manufacturer since authorized dealers can do
the work without sending the units back to the factory.
My wish would be for Aerosance to offer many different mixture mapping
programs, where you could pick and choose you performance features.
Crossing the Atlantic? Download the long range economy cruise program,
and run LOP at low rpms all the way. Flying from New York to Oregon for
the Lancair labor day fly-in? Download the high speed cruise program for
the cross-country trip, then install the Reno race settings upon
arrival.
Finally, my question: What is Aerosance's position on all of this? Some
of you who have dealt with them may have a feeling for their willingness
to support the experimental community. Understandably, they are
concentrating on the certified market first, but once that is done,
would they be willing to make changes? As the sytem becomes more mature,
will they tweak the mixture settings to improve fuel consumption at
higher power settings?
Thanks for listening,
Adam Molny
Ronkonkoma, NY
Legacy kit #151
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