X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 28 Dec 2005 01:17:58 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m21.mx.aol.com ([64.12.137.2] verified) by logan.com (CommuniGate Pro SMTP 5.0.5) with ESMTP id 902799 for lml@lancaironline.net; Tue, 27 Dec 2005 12:15:36 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.2; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m21.mx.aol.com (mail_out_v38_r6.3.) id q.207.ff4d744 (3866) for ; Tue, 27 Dec 2005 12:14:42 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <207.ff4d744.30e2d082@aol.com> X-Original-Date: Tue, 27 Dec 2005 12:14:42 EST Subject: N320WH Destroyed, No Injuries, idle power descent? X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1135703682" X-Mailer: 9.0 Security Edition for Windows sub 5300 X-Spam-Flag: NO -------------------------------1135703682 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Interesting commentary about descents from high altitude at idle and the failure to enrich the mixture causing a loss of power when the throttle is opened. Hmmmmmm..... Page 3-11 of my 1989 copy of the Cessna Manual of Flight says to "clear" the engine from time to time in an extended low power descent to ensure there is power available should a "change of plans" occur. How many of us taxi with a lean mixture and do the run up still lean to more fully check systems as recommended by John Deakin? How many have forgotten to go to full rich for take off and the initial power application results in the engine stumbling? Come on raise your hands out there - Yes, I had to stop typing so I could raise mine and I do see a few hands up out there. That's ok, you don't have to raise both unless you mean you did it more than once or have been frequently arrested. Was it the mismanagement of the engine after the stumble? What happens to a normally aspirated air cooled horizontally opposed 4-cyl aircraft engine after it spends some time at an idle throttle position with the prop in flat pitch - that is the prop is turning the engine at 2300 to 2500 RPM. Was the fire extinguished (no air, idle mixture richness)? Were the plugs hopelessly wet fouled or otherwise loaded up? Should one momentarily try hot start techniques - mixture at idle cutoff and throttle open? If the plugs were fouled, could a higher ignition voltage overcome such a problem? At such a low power setting (very low MAP), would spark advancement been beneficial in keeping the engine running? Verrrrry Interrrresting....... Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Happy New Year to all! -------------------------------1135703682 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Interesting commentary about descents from high altitude at idle a= nd=20 the failure to enrich the mixture causing a loss of power when the throttle=20= is=20 opened.

Hmmmmmm..... Page 3-11 of my 1989 copy of the Cessna Manual of Fl= ight=20 says to "clear" the engine from time to time in an extended low power=20 descent to ensure there is power available should a "change of plans"=20 occur.

How many of us taxi with a lean mixture and do the run=20 up still lean to more fully check systems as recommended by John=20 Deakin? How many have forgotten to go to full rich for take off and th= e=20 initial power application results in the engine stumbling? Come on rai= se=20 your hands out there - Yes, I had to stop typing so I could raise mine and I= do=20 see a few hands up out there. That's ok, you don't have to raise=20= both=20 unless you mean you did it more than once or have been frequently=20 arrested.

Was it the mismanagement of the engine after the stumble?

What happens to a normally aspirated air cooled horizontally opposed 4-= cyl=20 aircraft engine after it spends some time at an idle throttle position with=20= the=20 prop in flat pitch - that is the prop is turning the engine at 2300 to 2500=20 RPM. Was the fire extinguished (no air, idle mixture richness)? =20= Were=20 the plugs hopelessly wet fouled or otherwise loaded up? Should one=20 momentarily try hot start techniques - mixture at idle cutoff and throt= tle=20 open? If the plugs were fouled, could a higher ignition voltage=20 overcome such a problem? At such a low power setting (very low MAP), would s= park=20 advancement been beneficial in keeping the engine running?

Verrrrry Interrrresting.......=20

Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Hap= py=20 New Year to all!

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