Paul,

Attached is a copy of my first real data log taken today.  One pressure
sensor per rotor, no trigger though.  I revved it a couple of times
which you should be able to spot by the closer sine waves.  Bottom line
is it confirms a serious mismatch in airflows.

Mark


The plenum is too small. One rotor is getting all the air.
Go back to your original plenum. I think you will notice an increase
in engine smoothness.


You need to up the sample rate to 1000 samples per second and limit
the time it is on to 30 seconds or less. That is more  than enough
data to tell you  what is going one.  The curves will be more like
sin waves and smoother.

The three  audio waves in the intake manifolds are 120 degrees out
of phase. That won't become real clear until you up the sample rate
to 1000 samples per second or higher.

If you put a five volt zener diode on the CAS signal you can feed
that into one of the analog channels. It does not matter which one
but AI3 would be fine.



Paul Lamar



Cool data.

I concur on the sampling rate to a faster rate. I don't know that you need 1000..  Something like 2x what's currently there would probably do it. I suspect much of the lumpiness will go away with proper sampling.


Matt-

At over 6000 RPM it is essential.

Paul Lamar