This is a 2" by 6" aluminium extrusion about 4 inches long. This is
very similar to what I am doing with the ignition stuff so I am all
set up to machine the covers.

There is an aux board the same size as the MM board mounted below
the MM.

So far there are two VR sensor circuits and eight high current
drivers for four coils and four injectors on the aux board. The next
thing on the aux board will be two manifold pressure sensors. One
for the front rotor and one for the rear.

The back panel has the connectors for the VGA, the PC keyboard, the
USB connector and the 12 VOLT power connector.

The front panel will have two DB15's one for output and one for
input. Also a slot for the 65 gig SD card.

So far all through hole.
-----------------------------------------------------

Here is my latest iteration of the PC board. I added an RS232 9 pin
D-sub-min. Matt Boiteau is using that.

The surface mount manifold pressure sensors are on the right, 29 psi
so this board will work with turbo's. I am thinking of adding  EGT
sensor circuits.

EGT sensors respond slowly so It mind be possible adjust the mixture
in cruise.

Of course they could be displayed on the EFIS part.

Anybody have any other things they would like added?

I should have this running on the RV4 in a few weeks.


Paul Lamar


I would want egt circuits.

I have a friend with an RV7 that is slightly tail heavy. I machined
a prop plate for him, 3/4 inch thick and weighs just under 14 lbs.
There is a bit more vibration with this plate so it needs to be
balanced. Anybody have any advice on balancing such a thing?

Also if anybody wants to see my machinery/capabilities please visit
my website:  www.cimmfg.us

Randy 113A Mill St.  Silver Cliff CO  81252 Cimarron Mfg.
<http://cimmfg.us/

Mount it on a shaft and roll it on parallel bars.Unfortunately if it
is not symmetrical around a centre plane it may be out of dynamic
balance. In that case you need a dynamic balancer.

BTW Randy my NC covers are on hold until I get a bit more money. I
am making a few on my cheap Chinese mill by hand  with my poor man's
DRO :)

Paul Lamar
Paul, a dynamic balancer is something else you could run on a Maximite,
especially if you have a crank position sensor. You will need one more
analog input, in this case for an accelerometer. There are very cheap
strain gage accelerometers available now with preamp and signal
conditioning. You need one of these bolted to the engine block as close
as possible to the prop hub. You will get a waveform that you can
calibrate in Gs or inches per second, and as it's repetitive you can do
a running average which can be then with the crank sensor. The distance
between 0 degrees at the crank and the peak of acceleration shows you
where the heavy blade or part of the rotating machinery is. Dynamic
balancers have come down a lot in price in recent years but you could do
this for a few dollars. If you run an fft on the accelerometer waveform
you can see all the other rotating components. There are 3-axis
accelerometer chips that are also very cheap, you could plot the
vibration in all directions.

David Josephson


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