X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 1 [X] Return-Path: Sender: To: lml Date: Tue, 05 Dec 2006 10:55:56 -0500 Message-ID: X-Original-Return-Path: Received: from imo-m26.mx.aol.com ([64.12.137.7] verified) by logan.com (CommuniGate Pro SMTP 5.1.3) with ESMTP id 1641540 for lml@lancaironline.net; Tue, 05 Dec 2006 03:12:43 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.7; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-m26.mx.aol.com (mail_out_v38_r7.6.) id q.cad.4a2068e (42808) for ; Tue, 5 Dec 2006 03:12:15 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Tue, 5 Dec 2006 03:12:13 EST Subject: Re: [LML] Engine efficiency X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1165306333" X-Mailer: 9.0 Security Edition for Windows sub 5330 X-Spam-Flag: NO -------------------------------1165306333 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Fred, et al, There is at least one more factor to consider - Timing (assuming these engines are all running in dry air). I believe Taylor often assumes the timing set at optimal - even his experiments with timing changes were done with variances from the optimum. It can be demonstrated that, at lower power settings (like 65%), the same power can be developed at a more optimal timing (different than the compromise fixed timing, i.e. earlier than 25 DBTDC) at a lower fuel consumption (or, more power developed at the same fuel flow). Scott Krueger AKA Grayhawk Lancair N92EX IO320 SB 89/96 Aurora, IL (KARR) A man has got to know his limitations. -------------------------------1165306333 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Fred, et al,
 
There is at least one more factor to consider - Timing (assuming these=20 engines are all running in dry air).  I believe Taylor often=20 assumes the timing set at optimal - even his experiments with timing=20 changes were done with variances from the optimum.  It can be=20 demonstrated that, at lower power settings (like 65%), the same po= wer=20 can be developed at a more optimal timing (different than the compromise fix= ed=20 timing, i.e. earlier than 25 DBTDC) at a lower fuel consumption (or, more po= wer=20 developed at the same fuel flow).=20
 
Scott Krueger=20 AKA Grayhawk
Lancair N92EX IO320 SB 89/96
Aurora, IL (KARR)

A m= an=20 has got to know his limitations.
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