X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-ew0-f52.google.com ([209.85.215.52] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTP id 4556658 for flyrotary@lancaironline.net; Fri, 05 Nov 2010 12:28:02 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.215.52; envelope-from=rwstracy@gmail.com Received: by ewy1 with SMTP id 1so1954954ewy.25 for ; Fri, 05 Nov 2010 09:27:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=JEb5gqWg3TXaIrZz/Rt2ZEBCWEVKH3vXwxON8HttmUA=; b=cZI+iBlWWbARst70ld8z46wQIa/6XYMdkPxQE/f87QaBVbhTGz8BAwkCZE2xZOMftK lXSNPN1d1utVcTA1EHJOWZFwyIkBfJw51IjdgjtANDnMHHFnvq8H282fDV50PogqYmsH haHYoeZtvemqCdmzGt+C2vhLRGFPRX0/5E5fE= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=iG3Xr0XU4LrBoMPweHZ060u0p1LjneupAY7e4MRdI7TNizptAjNoaR074FHOqsq+m6 AE0BDBY8eu5K3oOmx/5lYE/oEGsIQxIng1qOFvrZQm/3meRlSesqv0W5er5apU4pXSFm sNHMjB1neXNnrlQV+Z41d2OstcuzfXIHJwqdE= MIME-Version: 1.0 Received: by 10.216.11.201 with SMTP id 51mr1258112wex.72.1288974444051; Fri, 05 Nov 2010 09:27:24 -0700 (PDT) Sender: rwstracy@gmail.com Received: by 10.216.21.145 with HTTP; Fri, 5 Nov 2010 09:27:23 -0700 (PDT) In-Reply-To: References: Date: Fri, 5 Nov 2010 12:27:23 -0400 X-Google-Sender-Auth: lr4PnAKHNhD0JnKELBvYsbKeSm8 Message-ID: Subject: Re: [FlyRotary] Re: Fuel Useage error? From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016364c7bd1dcc0c1049450bf8d --0016364c7bd1dcc0c1049450bf8d Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Great data as always Steve, thanks! Most builders never dig into the details far enough to notice them but the latest version of both the EC2/3 and EM2/3 have parameters for compensating for the staging flow factors being discussed. Mode 6 is the EC2/3 factor. The EM2/3 has a similar factor for calibrating the difference in fuel flow between staged & non staged. Tracy On Fri, Nov 5, 2010 at 11:58 AM, Steven W. Boese wrote: > Ed, > > > > The default staging threshold of my EC2=92s that were updated in February= of > this year is a value of 21 which corresponds to a staging MAP of 20.5=94 = Hg. > This is in a region where it is more likely to encounter the fuel flow er= ror > than the staging MAP of 15=94 Hg that you are using. It seems to me that= it > is useful to know that the error exists and to be aware of the conditions > where it might become a problem. > > > > It is my intention to conduct flight testing specifically designed to > further verify the magnitude of the error. It would be nice if I found t= hat > no error exists, but that seems very unlikely. > > > > Steve > > > > > > *From:* Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] *O= n > Behalf Of *Ed Anderson > *Sent:* Friday, November 05, 2010 9:23 AM > *To:* Rotary motors in aircraft > *Subject:* [FlyRotary] Fuel Useage error? > > > > Ok, Steve, > > > > I think that answer my question to you about why my total fuel consumptio= n > measure by my PW integration system did not seem to reflect the magnitude= of > the errors we had discussed. > > > > Since I seldom (if ever - except during taxi/landing) operate near or bel= ow > my staging point in flight - and I do not appear to be getting (at least > the magnitude) error when I compare my instruments "Fuel Used" amount wit= h > what I measure when I fill up the tanks. My manifold pressure in flight > rarely drops below 20-22 " hg. > > > > One reason is I generally run with my throttle wide open to reduce pumpin= g > loses and I tweak the mixture to keep it running smoothly - so my staging > point (around 15" Hg) is only seen on the ground and while in the landing > pattern. Since I spend very little time in those regimes, I am seldom ne= ar > or below my staging point. > > > > So that could explain why I am apparently not seeing the difference you > data indicates > > > > Ed > > > > > > > > > > > > Edward L. Anderson > Anderson Electronic Enterprises LLC > 305 Reefton Road > Weddington, NC 28104 > http://www.andersonee.com > http://www.eicommander.com > --0016364c7bd1dcc0c1049450bf8d Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable Great data as always Steve, thanks!

Most builders never dig into the= details far enough to notice them but the latest version of both the EC2/3= and EM2/3 have parameters for compensating for the staging flow factors be= ing discussed.=A0 Mode 6 is the EC2/3 factor.=A0 The EM2/3 has a similar fa= ctor for calibrating the difference in fuel flow between staged & non s= taged.

Tracy

On Fri, Nov 5, 2010 at 11:58 AM= , Steven W. Boese <= SBoese@uwyo.edu> wrote:

Ed,

=A0

The default staging threshold of my EC2=92s that were updated in February of this year is a value of 21 which corresponds to a staging MAP of 20.5=94 Hg.=A0 This is in a region where it is more likely to encounter the fuel flow error than the staging MAP of 15=94 Hg that you are using.=A0 It seems to me that it is useful to know that the error exists and to be aware of the conditions where it might become a prob= lem.

=A0

It is my intention to conduct flight testing specifically designed to further verify the magnitude of the error.=A0 It would be nice if I foun= d that no error exists, but that seems very unlikely.

=A0

Steve

=A0

=A0

From:= Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Ed Anderson
Sent: Friday, November 05, 2010 9:23 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Fuel Useage error?

=A0

Ok, Steve,

=A0

I think that answer my question to you about why my total fuel consumption measure by my= PW integration system did not seem to reflect the magnitude of the errors we h= ad discussed.

=A0

Since I seldom (if ever - except during taxi/landing) operate near or below my stag= ing point in flight - and =A0I do not appear to be getting (at least the magnitude) error when I compare my instruments "Fuel Used" amount with what I measure when I fill up the tanks.=A0=A0 My manifold pressure in flight rarely drops below 20-22 " hg.=A0

=A0

One reason is I generally run with my throttle wide open to reduce pumping loses and I tw= eak the mixture to keep it running smoothly - so my staging point (around 15&qu= ot; Hg) is only seen on the ground and while in the landing pattern.=A0 Since I spend very little time in those regimes, I am seldom near or below my stagi= ng point.

=A0

So that could explain why I am apparently not seeing the difference you data indicates

=A0

Ed=A0

=A0

=A0

=A0

=A0

=A0

Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com


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