Merry Christmas!

Been away from the shop a bit.  Christmas with the family, shopping, work etc.  There are important things in life besides airplanes I suppose :)  That doesn't stop me from doing reasearch.  Okay, you can call it browsing if you like.

I wanted to share a website I found called experimentalavionics.com

One of the biggest decisions to be made with my build is what avionics I want in my panel.  This of course is guided by the three points of mission, cost and simplicity in that order, although they aren't mutually exclusive either.  Simplicity generally leads to lower cost.  Mission needs vs wants can also directly influence cost up or down.  With a bit of work, the following items can be built very inexpensively, with off the shelf parts and instructions found online.

My aircraft mission is simple enough.  I don't need to go fast or high (the Zenair 750 isn't pressurized nor is it a speed demon) and I won't be flying IFR (instrument flight rules).  I do want good communications (it's actually what I do for a living!) and the ability to navigate outside the normal ATC coverage areas to some of those good fishing/camping spots.

I'm using a converted Corvair automobile engine.  Instrumentation for this is simple too.

The idea of building my own EMS (Engine Monitoring System) from open source electronics/software fits both my budget and interests in learning.  I have learned enough electronics skills over the years to build it (thanks to Mom and Dad for starting my learning in basic electronics by buying me this when I was a kid).  Whether this becomes my primary engine instrumentation or a back up to the traditional analog engine guages will be decided later after I do some more research.  It might look something like this:

A nice, easy to read display suitable for the 6 cylinder Corvair engine.  The bonus is how much panel space I'd save and the ability to datalog the information for testing mods or diagnosing trends.  Alarm annunciators (flashing warning lights or audio) can easily be added for any parameter that goes out of range.  Cool!

The other panel items such as primary flight instruments (altimeter, VSI, etc) require more thought.  I like traditional instruments for their familiar simplicity.  For the same reasons as the EMS, a EFIS (Electronic Flight Information System) has an intriguing draw, but I'll likely have something like this as my backup instruments:

Again, easy to read, simple and space saving.  6 instruments and a clock all in one place.

A couple of cons that I'll need to consider are temperature operating range and failure modes.  It gets real cold where I'll be keeping the plane when it's built (unless I win the lottery, then it's heated floor hanger all the way!)  

As for failure modes, how comfortable am I putting all indicators in one place, where a single failure may result in losing everything at once.

The website that I linked above also includes preliminary discussions on intercoms for pilot/passenger communication and a WiFi based AHRS (Attitude Heading Reference System) that could link wirelessly to a tablet for navigation.  Perhaps someone will adapt the AHRS to be an inexpensive ADS-B out module!

Lots to think about...  

Happy New Year everyone :)