X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 29 May 2007 23:00:12 -0400 Message-ID: X-Original-Return-Path: Received: from imo-m27.mx.aol.com ([64.12.137.8] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2073836 for lml@lancaironline.net; Tue, 29 May 2007 22:29:09 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.137.8; envelope-from=PTACKABURY@aol.com Received: from PTACKABURY@aol.com by imo-m27.mx.aol.com (mail_out_v38_r9.2.) id q.c10.1448fbe1 (40521) for ; Tue, 29 May 2007 22:28:27 -0400 (EDT) From: PTACKABURY@aol.com X-Original-Message-ID: X-Original-Date: Tue, 29 May 2007 22:28:27 EDT Subject: Re: [LML] Re: TSIO 550 LOP X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1180492107" X-Mailer: 9.0 Security Edition for Windows sub 5365 X-Spam-Flag: NO -------------------------------1180492107 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 5/29/2007 11:10:10 A.M. Pacific Daylight Time, walter@advancedpilot.com writes: OK, Paul, let's review the issue. Compression ratio: The higher CR WILL ALWAYS result in a lower EGT/TIT if all else is held constant. Why? Boyle's Law. PV = nRT. As the volume expands, the gas temperature goes down. More expansion; more temp loss = lower EGT. Walter: There is no issue here to review, so please step away from the tutorial podium. I fat fingered my previous email and met 17.5 rather than 7.5 so I was intending to compare a rate to a rate. Your simplistic physics above is all just dandy, but all else is never held constant. The timing recommended by the engine builder for a 8.5 and 7.5 are different, the MP is different to recapture some of the detonation margin and so on. All this has little to do with my original question which was at the same rate of consumption of a precious resource, disposable income, what sort of KIAS are LIV drivers achieving. You said in a previous email that a typical cruise fuel flow LOP for the TSIO-550 is 17.5 gph so fine, what indicated airspeeds are we seeing and if anyone now cares, if there are differences what accounts for those differences. If higher CRs are more fuel efficient as has been stated by many, well I would expect to see LIVs equip with those engines cruising at 17.5gph attaining a higher indicated airspeed. I chose KIAS because I thought it would simplify data collection. Simple stuff, and since I did not spend my time building a test stand, meaningful stuff at least for me. paul ************************************** See what's free at http://www.aol.com. -------------------------------1180492107 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 5/29/2007 11:10:10 A.M. Pacific Daylight Time,=20 walter@advancedpilot.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>OK,=20 Paul, let's review the issue. =20

Compression ratio:

The higher CR WILL ALWAYS result in a lower EGT/TIT if all else is he= ld=20 constant. Why? Boyle's Law. PV =3D nRT. As the vol= ume=20 expands, the gas temperature goes down. More expansion; more temp lo= ss =3D=20 lower EGT.

Walter:

There is no issue here to review, so please step away from the tutorial= =20 podium. I fat fingered my previous email and met 17.5 rather= =20 than 7.5 so I was intending to compare a rate to a rate. Your simplist= ic=20 physics above is all just dandy, but all else is never held=20 constant. The timing recommended by the engine builder for a 8.5 a= nd=20 7.5 are different, the MP is different to recapture some of the detonation=20 margin and so on. All this has little to do with my original question=20 which was at the same rate of consumption of a precious resource, disposable= =20 income, what sort of KIAS are LIV drivers achieving. You said in a=20 previous email that a typical cruise fuel flow LOP for the TSIO-550 is 17.5=20= gph=20 so fine, what indicated airspeeds are we seeing and if anyone now cares, if=20 there are differences what accounts for those differences. If higher C= Rs=20 are more fuel efficient as has been stated by many, well I would expect to s= ee=20 LIVs equip with those engines cruising at 17.5gph attaining a higher indicat= ed=20 airspeed. I chose KIAS because I thought it would simplify data=20 collection. Simple stuff, and since I did not spend my time building a= =20 test stand, meaningful stuff at least for me.

paul

See what's free=20= at AOL.com.

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