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1. 11:06 PM - EFIS 1 and SL-30 (Dean Psiropoulos)
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| Subject: | EFIS 1 and SL-30 |
--> Avionics-List message posted by: "Dean Psiropoulos" <deanpsir@easystreet.com>
Years ago:
Actually not as long ago as one might think, aircraft instruments were
electro-mechanical devices (as opposed to TV screens). These
electro-mechanical instruments were driven by analog electronics (instead of
digital computers) and those interfaces were mainly resolver and synchro (as
opposed to RS232 and USB). Resolvers are rotational sensors that are driven
by the little knobs on aircraft mechanical instruments (ie. Omnibearing
selector on the VOR head). Synchros are the little "motors" inside aircraft
mechanical instruments that drive airspeed and altimeter (on old Boeing 727s
for example).
These little critters are something akin to stepper motors that are used in
computer printers today. They are 3 phase devices that can be driven to a
precise position to facilitate accurate pointing of the hands on an airspeed
indicator (on large commercial aircraft, our mechanical airspeed indicators
are of course driven by the pitot static system) or.....sense the
positioning of a knob when someone inputs data into a 727's autopilot for
example. Resolver and synchro use is much more prevalent on large
commercial aircraft however it does filter down into the GA arena (quite a
bit on biz jets, very little on piston singles).
Bottom line for your EFIS dilemma is that you will NOT be able to use a
conventional electromechanical VOR/ILS indicator with the SL-30 set to the
serial mode. You'll need a VOR/ILS indicator that outputs/accepts serial
data in the format that the SL-30 uses it. It may be possible that you can
rig up some kind of relay where you can flip a switch and transfer the
signal to an electromechanical VOR/ILS indicator if the EFIS dies but I
haven't looked into this. And since I bought the Dynon instead of the Blue
Mountain, I won't be needing to solve this problem for my airplane (I also
won't have the cool HSI you all have either). Let us know what you finally
do to solve this one. Thanks.
Dean Psiropoulos
RV-6A, 24907
Canopy is finally on!!!!
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