From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: EC2/3 Tuning
Message-Id: <40E0116D-4931-4EB5-AAED-E96579F7C6C4@gmail.com>
Date: Tue, 24 May 2022 13:48:23 +0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Hi people.

I have a question about tuning the EC2/3=E2=80=99s and particularly Mode =
#2 'Dynamic Range Adjust'

I have left Mode #2 at the default setting and no problem tuning. =
However here is the thing:

I have some friends that are very experienced pilots (unlike myself) and =
on flying the Glasair they have asked if it is possible to adjust the =
mixture control so that at:=20
1. Full CW rotation sets full rich which in my experience and =
understanding is ~0.85 lambda or 12.5:1 AFM, and
2. Full CCW rotation sets full lean, again I=E2=80=99m thinking ~1.07 =
lambda or 15.8:1

It's really point 1. I=E2=80=99m interested in.

What my friends are asking is that they are confident that behind their =
Lycomings in an emergency they just push that Red knob all the way in =
and get on with flying the aeroplane.=20
In my setup, if I turn the Mixture Knob full rich it would probably make =
the fan stop. My Mixture Knob set at 12 O=E2=80=99clock is about =
Stoichiometric and best power is less than 2 O=E2=80=99clock.

For them, this is a significant safety issue.

But I=E2=80=99m struggling with the description in the Programming =
Guide.

Can anyone confirm that adjusting Mode #2 'Dynamic Range Adjust=E2=80=99 =
will change, well, the 'Dynamic Range' of both the mixture correction =
table and the Mixture Knob.

Could I reduce the Dynamic Range parameter so that once the MCT is set =
correctly I will then have a situation where quickly turning the Mixture =
Control FULL CW the Engine will be at Full Rich.

If it does what I=E2=80=99m thinking/hoping, the adjustments required in =
the MCT will be larger.=20
Currently my MCT adjustment amounts are positive and negative about half =
of the available range (-70 & +60 decimal)
So by reducing the Dynamic Range by approx. half, will I then need the =
full +- 127 decimal range of the MCT and will the Mixture Knob then be =
approx half as sensitive?

I didn=E2=80=99t want to mess up my tune before asking if someone can =
confirm how Mode #2 works.

Thanks

Steve Izett
Renesis 4 port RD1-C EC2 EM3