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Add to the RMI encoder the option of a backup
heading source. For about $300, you can add a compass module that gives
heading readouts on the instrument. I've found it much more accurate than
my wet compass. Additionally, all of the air data can be sent via serial
stream to your GPS in a wide range of formats. I'm told that sending this
data to the Garmin GPS's will enable you to get a wind readout. (Sadly, my
Apollo GPS lacks the algorithm to make that computation).
As an aside, I saw the panel for Steve Fossett's
non-stop around the world jet that Burt Rutan built for him in Aviation
Week. In addition to Chelton displays and Tru Trak auto pilots, he
has an RMI encoder to provide backup readouts of all of his pitot static
instruments.
Of all the goodies I put in my panel, this has to
be the best bang for the buck I have. I use the TAS readout
regularly, the density altitude readout on hot days, and use the heading
readout to set and check the compass card on my HSI. I also used the gray code
altitude output for my mode C on the XPDR, saving me the extra cost of an
encoding altimiter. A comparable Shadin Air Data Computer costs thousands
of dollars and the only capability it has that the RMI doesn't is fuel flow
data.
Skip Slater
N540ES
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