X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Thu, 29 Dec 2005 11:27:01 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d22.mx.aol.com ([205.188.144.208] verified) by logan.com (CommuniGate Pro SMTP 5.0.5) with ESMTP id 905178 for lml@lancaironline.net; Thu, 29 Dec 2005 11:12:52 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.208; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d22.mx.aol.com (mail_out_v38_r6.3.) id q.78.11f18d4 (3866) for ; Thu, 29 Dec 2005 11:11:49 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <78.11f18d4.30e564c5@aol.com> X-Original-Date: Thu, 29 Dec 2005 11:11:49 EST Subject: Re: [LML] Re: N320WH Destroyed, No Injuries, idle power descent? X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1135872709" X-Mailer: 9.0 Security Edition for Windows sub 5300 X-Spam-Flag: NO -------------------------------1135872709 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 12/29/2005 9:12:10 A.M. Central Standard Time, marv@lancaironline.net writes: George, Could you gather a little data for me? Sure. I know that the big bore TCM engines - - if set up properly LOP at high power at altitude, will always operate nicely with no mixture adjustment after a long descent. Hmmm... At 2500 RPM and pulling back to 17-19 inches (maintained thru the descent), I always twist the Mixture vernier for a bit more fuel every few thousand feet as the EGTs change (rise) in a 400+ fpm descent that forces me to operate at 190-210 KIAS with ram air pressure greater than it was at cruise. Usually, when I level off, the mixture will be just about right to either finally slow down or reapply power back to 25" MAP. But I don't have any recent experience (I owned a Mooney for 1500 hours - - years ago ) with the fuel system on the Lycoming engines. What happens to your engine if you have it well LOP at altitude and then descend without adjusting the mixture and power up after a 10 or 15K foot descent ??? Hmmm.... OK, at the next opportunity, I will perform a constant speed (135-140 KIAS) climb to 12000 feet (away from ORD), set up cruise at 30-40 LOP, and descend (say 500 fpm or so, I don't have TRU-TRAK) as you requested unless something exotic occurs - I will be writing furiously during this exercise unless the traffic alerter starts to nag at me. For those interested, I will be reporting LSE timing also. Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) Happy New Year to all! -------------------------------1135872709 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
In a message dated 12/29/2005 9:12:10 A.M. Central Standard Time,=20 marv@lancaironline.net writes:
 
George,
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>Could=20 you gather a little data for me?
Sure.
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>
  
 
  I know that the big bore T= CM=20 engines - - if set up properly LOP at high
  power at altitude,&nb= sp;=20 will always operate nicely with no mixture
  adjustment after a lo= ng=20 descent.
Hmmm...  At 2500 RPM and pulling back to 17-19 inches (maintained=20= thru=20 the descent), I always twist the Mixture vernier for a bit more fuel ev= ery=20 few thousand feet as the EGTs change (rise) in a 400+ fpm des= cent=20 that forces me to operate at 190-210 KIAS with ram air pressure greater= =20 than it was at cruise.  Usually, when I level off, the mixture will be=20= just=20 about right to either finally slow down or reapply power back to 25" MAP.&nb= sp;=20
<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000=20 size=3D2>
 
 
  But I don't have any recent expe= rience=20 (I owned a Mooney for 1500 hours
  - - years ago <g>) with=20 the  fuel system on the Lycoming engines.  What
  happen= s to=20 your engine if you have it well LOP at altitude and then
  descend= =20 without adjusting the mixture and power up after a 10 or 15K
  foo= t=20 descent ???
 
Hmmm....  OK, at the next opportunity,  I will perform a cons= tant=20 speed (135-140 KIAS) climb to 12000 feet (away from ORD), set up cruise at 3= 0-40=20 LOP, and descend (say 500 fpm or so, I don't have TRU-TRAK) as you requested= =20 unless something exotic occurs - I will be writing furiously during this=20 exercise unless the traffic alerter starts to nag at me.  For those=20 interested, I will be reporting LSE timing also.=20
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

Hap= py=20 New Year to all!



-------------------------------1135872709--