OK I get the feeling nobody is going to guess what I have in mind.

Absolutely the cheapest way to do an EFIS is use voice synthesizing
technology.  No expensive LCD, LED or PDA at all.
Although bar graph LEDs are a very cheap way to go but they do take
up space on the instrument panel and suck power.

Everybody that flies an airplane has a head set.

"Your EGT on rotor one is 1400 degrees."
"Your EGT on rotor two is 1450 degrees."
"Your coolant temp is 220 degrees."
"Your oil pressure is 80 psi."
"etc., etc., etc.."

You could push one of several buttons each with different info on
the stick or on the instrument panel to get the info when you
wanted it or allow the system to inform you when something went
out of preset limits. If something started changing too
fast it could warn you automatically.

It could also work as a stall warning.

"PUSH THE STICK YOU ARE GOING TO STALL!"
"PUSH THE STICK YOU ARE GOING TO STALL!"
"PUSH THE STICK YOU ARE GOING TO STALL!"


The possibilities are infinite. The cost and panel space are minimal.

http://www.rcsys.com

Paul Lamar

  I have an engine monitor from Audio Flight Avionics. Fits in a single
standard instrument hole and has a single line LCD display. All parameters
scroll through the display at a rate set by the user or the user can set
the display to show any of the parameters wanted. High and low limits are
fully programmable and any time a parameter goes out of limits that
parameter pops up on the LCD and the monitor anounces via the
intercom/headset what parameter failed.

  My monitor handles:
RPM
MP
Coolant temp
Coolant pressure
Oil temp
Oil pressure
Fuel pressure
EGT (2)
Volts
Amps
Also has built in user programmable timers and Hobbs.
And has a remote 4 line x 40 character LCD that can be installed wherever
is convenient.

  I paid $800 with all sensors a few years ago. Unfortunately Audio Flight
Avionics is no longer in business. I thought it was a great bang for the
buck unit.

Mike Wills

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