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From: "Steven W. Boese" <SBoese@uwyo.edu>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Date: Thu, 26 Nov 2009 22:08:58 -0700
Subject: RE: [FlyRotary] Re: Ground isn't ground
Thread-Topic: [FlyRotary] Re: Ground isn't ground
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Tracy,

One of the EC2's was updated 01/30/2009 and the other was updated 05/04/200=
9.  While there is a difference in these two EC2's as to how they determine=
 which regions of the MAP table to use, they both are similar with regard t=
o the low RPM coil dwell times.

Abnormally short (or long) dwell times are observed from the minimum RPM th=
at the EC2 generates signals up to the "threshold" at around 1200 RPM.  Abo=
ve that threshold, dwell times are consistently in the range of 4-5 ms. =20

Steve Boese

________________________________________
From: Rotary motors in aircraft [flyrotary@lancaironline.net] On Behalf Of =
Tracy Crook [tracy@rotaryaviation.com]
Sent: Thursday, November 26, 2009 8:05 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Ground isn't ground

Steve, I was looking at the wrong image (the one you sent of the CAS & dwel=
l at cranking speed of ~150 rpm.)  .  I must have missed this other one whe=
n you posted it.   I'll take a look at the 1200 rpm dwell behavior again.  =
 I never noticed that.  Possibly because 1200 is well above cranking speed =
but below my idle speed of 1600 rpm.

Do you recall the date of your last EC2 update?  The low rpm dwell algorith=
m has changed a few times.

Tracy