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 4557983 for flyrotary@lancaironline.net; Sat, 06 Nov 2010 15:29:58 -0400 Received-SPF: none receiver=logan.com; client-ip=129.72.10.31; envelope-from=SBoese@uwyo.edu Received: from ponyexpress-ht1.uwyo.edu (ponyexpress-ht1.uwyo.edu [10.84.60.208]) by willowsprings.uwyo.edu (8.14.4/8.14.4) with ESMTP id oA6JTJup013938 (version=TLSv1/SSLv3 cipher=AES128-SHA bits=128 verify=FAIL) for ; Sat, 6 Nov 2010 13:29:19 -0600 (MDT) (envelope-from SBoese@uwyo.edu) Received: from ponyexpress-mb5.uwyo.edu ([fe80::9813:248c:2d68:a28b]) by ponyexpress-ht1 ([10.84.60.208]) with mapi; Sat, 6 Nov 2010 13:29:19 -0600 From: "Steven W. Boese" To: Rotary motors in aircraft Date: Sat, 6 Nov 2010 13:29:17 -0600 Subject: RE: [FlyRotary] Re: EM-2 fuel flow readings - Above and Below stagging Thread-Topic: [FlyRotary] Re: EM-2 fuel flow readings - Above and Below stagging Thread-Index: Act9zLz52w/OEm6OTcOMtJJcRJPeeQAGpKNw 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_E1AA3B1AF41D8049B1E3FBD5E225626004E4EE6426ponyexpressmb_" MIME-Version: 1.0 --_000_E1AA3B1AF41D8049B1E3FBD5E225626004E4EE6426ponyexpressmb_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Dennis, If the EM-2 works in a similar way to the discreet component instrument tha= t I made does, the instrument may monitor one injector pulse signal and the= staged on/off condition. When the instrument senses that the transition t= o using all the fuel injectors has occurred, the calculated flow rate is mu= ltiplied by two. If for some reason, the transition back to using just the= primary injectors is not recognized, the fuel flow will still be multiplie= d by two. Since this is probably done in the programming of the EM-2, it's= might not something you could fix. Steve Boese From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Beh= alf Of Dennis Havarlah Sent: Saturday, November 06, 2010 10:06 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: EM-2 fuel flow readings - Above and Below stagging Bill has "seen" the same problem I've seen for several years and could not = get fixed. Fuel flow while operating staged is very low and the EM-2 shows= the correct rate when you first start the engine and you have not operated= above staging. After I open the throttle to above the staging point - take off and fly - a= nd than reduce throttle to below the staging point when descending to land = - my EM-2 fuel flow rate "hangs-up" and continues to show the higher flow r= ate it showed at the higher manifold pressure above staging. I have not fo= und any way to fix this. Bill experienced this when he intentionally went above staging and than red= uced the throttle to below staging on the ground during EC-2 tuning. My staging point is set at 16 in. MP. Dennis H. --_000_E1AA3B1AF41D8049B1E3FBD5E225626004E4EE6426ponyexpressmb_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Dennis,

If the EM-2 works in a similar way to the discreet component instrument that I made does, the instrument may monitor one injector pulse signal and the staged on/off condition. When the instrument senses th= at the transition to using all the fuel injectors has occurred, the calculated flo= w rate is multiplied by two. If for some reason, the transition back to usin= g just the primary injectors is not recognized, the fuel flow will still be multiplied by two. Since this is probably done in the programming of = the EM-2, it’s might not something you could fix.

Steve Boese

From: Rotary motors= in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Dennis Havarlah
Sent: Saturday, November 06, 2010 10:06 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: EM-2 fuel flow readings - Above and Below stagging

Bill has "seen" the same problem I've seen for several years and could= not get fixed. Fuel flow while operating staged is very low and th= e EM-2 shows the correct rate when you first start the engine and y= ou have not operated above staging.
After I open the throttle to above the staging point - take off and fl= y - and than reduce throttle to below the staging point when descending to land - my EM-2 fuel flow rate "hangs-up" and continues to show= the higher flow rate it showed at the higher manifold pressure above staging.&n= bsp; I have not found any way to fix this.

Bill experienced this when he intentionally went above staging and than reduced = the throttle to below staging on the ground during EC-2 tuning.

My staging point is set at 16 in. MP.

Dennis H.

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