X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from willowsprings.uwyo.edu ([129.72.10.31] verified) by logan.com (CommuniGate Pro SMTP 5.3.10) with ESMTPS id 4556616 for flyrotary@lancaironline.net; Fri, 05 Nov 2010 11:59:25 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.31; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht2.uwyo.edu (ponyexpress-ht2.uwyo.edu [10.84.60.209]) by willowsprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id oA5FwUiS005267 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Fri, 5 Nov 2010 09:58:47 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-mb5.uwyo.edu ([fe80::9813:248c:2d68:a28b]) by ponyexpress-ht2 ([10.84.60.209]) with mapi; Fri, 5 Nov 2010 09:58:42 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Date: Fri, 5 Nov 2010 09:58:37 -0600 Subject: RE: [FlyRotary] Fuel Useage error? Thread-Topic: [FlyRotary] Fuel Useage error? Thread-Index: Act8/WgAWiC8DQkMQLCLzdeXIdywqQAAvuqg Message-ID: References: In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/alternative; boundary="_000_E1AA3B1AF41D8049B1E3FBD5E225626004E4EE62E5ponyexpressmb_" MIME-Version: 1.0 --_000_E1AA3B1AF41D8049B1E3FBD5E225626004E4EE62E5ponyexpressmb_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Ed, The default staging threshold of my EC2's that were updated in February of = this year is a value of 21 which corresponds to a staging MAP of 20.5" Hg. = This is in a region where it is more likely to encounter the fuel flow err= or than the staging MAP of 15" 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 condition= s where it might become a problem. It is my intention to conduct flight testing specifically designed to furth= er verify the magnitude of the error. It would be nice if I found that no = error exists, but that seems very unlikely. Steve From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf 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 consumption = measure by my PW integration system did not seem to reflect the magnitude o= f the errors we had discussed. Since I seldom (if ever - except during taxi/landing) operate near or below= 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 with = what I measure when I fill up the tanks. My manifold pressure in flight r= arely drops below 20-22 " hg. One reason is I generally run with my throttle wide open to reduce pumping = loses and I tweak the mixture to keep it running smoothly - so my staging p= oint (around 15" Hg) is only seen on the ground and while in the landing pa= ttern. Since I spend very little time in those regimes, I am seldom near o= r below my staging point. So that could explain why I am apparently not seeing the difference you dat= a indicates Ed Edward L. Anderson Anderson Electronic Enterprises LLC 305 Reefton Road Weddington, NC 28104 http://www.andersonee.com http://www.eicommander.com --_000_E1AA3B1AF41D8049B1E3FBD5E225626004E4EE62E5ponyexpressmb_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Ed,

 

The default staging threshold of my EC2’s that were updated in February of this year is a value of 21 which corresponds to a staging MAP of 20.5” Hg.  This is in a region where it is more likely to encounter the fuel flow error than the staging MAP of 15” H= g 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 prob= lem.

 

It is my intention to conduct flight testing specifically de= signed to further verify the magnitude of the error.  It would be nice if I f= ound that no error exists, but that seems very unlikely.

 

Steve

 

 

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

 

Ok, S= teve,

 

I thi= nk 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.

 

Since= I seldom (if ever - except during taxi/landing) operate near or below my stag= ing point in flight - and  I 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.   My manifold press= ure in flight rarely drops below 20-22 " hg. 

 

One r= eason 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.  Sinc= e I spend very little time in those regimes, I am seldom near or below my stagi= ng point.

 

So th= at could explain why I am apparently not seeing the difference you data indicates

 

Ed 

 

 

 

 

 

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

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