From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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To: flyrotary@lancaironline.net
Subject: EC3/EM3 data point
Message-ID: <5c121055-bba2-13c1-a451-5e9cd66dad44@verizon.net>
Date: Fri, 29 May 2020 21:43:38 -0400
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Data point from Tracy: Even though the manual states: "The EC3 sends 
engine information over a serial link to the EM2 engine monitor (if 
used) *including engine speed *and many other parameters.", he early on 
abandoned using that. Too much jitter on the signal from the early 13B 
due to gear lash in the mechanical CAS. And from there on he just kept 
using the injector 1 pulse for RPM (and fuel flow).

So EM2/EM3 always requires some tach input.

Finn


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    <p>Data point from Tracy: Even though the manual states: "The EC3
      sends engine information over a serial link to the EM2 engine
      monitor (if used) <b>including engine speed </b>and many other
      parameters.", he early on abandoned using that. Too much jitter on
      the signal from the early 13B due to gear lash in the mechanical
      CAS. And from there on he just kept using the injector 1 pulse for
      RPM (and fuel flow).<br>
    </p>
    <p>So EM2/EM3 always requires some tach input.</p>
    <p>Finn<br>
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