X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 30 May 2007 16:49:23 -0400 Message-ID: X-Original-Return-Path: Received: from [70.62.14.124] (HELO server1.USTEK) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2075332 for lml@lancaironline.net; Wed, 30 May 2007 16:00:30 -0400 Received-SPF: none receiver=logan.com; client-ip=70.62.14.124; envelope-from=r.simon@ustek.com MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7A2F5.77DF439A" Subject: RE: [LML] Re: TSIO 550 LOP Content-class: urn:content-classes:message X-MimeOLE: Produced By Microsoft Exchange V6.5 X-Original-Date: Wed, 30 May 2007 16:02:30 -0400 X-Original-Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: TSIO 550 LOP thread-index: Acei9XQY9U98sIZnS7SWwWPnduV5SA== From: "Lancair" X-Original-Sender: "Robert Simon" X-Original-To: , "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C7A2F5.77DF439A Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Following this thread I have read a lot about pilots flying behind a TSIO550 and burning 17.5 gph. My ES-P (7.5 CR) flys at FL250 set at 31.5" and 2500 rpm, burning 15.5-16.0 gph LoP and showing a TAS of 230+kt. I have a LightSpeed dual EI system and turn an MT 4-blade prop. =20 Robert M. Simon ES-P N301ES =20 ________________________________ From: PTACKABURY@aol.com [mailto:PTACKABURY@aol.com]=20 Sent: Tuesday, May 29, 2007 11:00 PM To: lml@lancaironline.net Subject: Re: [LML] Re: TSIO 550 LOP 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. =20 Compression ratio: The higher CR WILL ALWAYS result in a lower EGT/TIT if all else is held constant. Why? Boyle's Law. PV =3D nRT. As the volume = expands, the gas temperature goes down. More expansion; more temp loss =3D 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 AOL.com .=20 ------_=_NextPart_001_01C7A2F5.77DF439A Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Following = this thread I=20 have read a lot about pilots flying behind a TSIO550 and burning = 17.5=20 gph. My ES-P (7.5 CR) flys at FL250 set at 31.5" = and 2500=20 rpm, burning 15.5-16.0 gph LoP and showing a TAS of 230+kt. I = have a=20 LightSpeed dual EI system and turn an MT 4-blade prop.

Robert M.=20 Simon

ES-P = N301ES

From: PTACKABURY@aol.com = [mailto:PTACKABURY@aol.com]=20
Sent: Tuesday, May 29, 2007 11:00 PM
To:=20 lml@lancaironline.net
Subject: Re: [LML] Re: TSIO 550=20 LOP

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

OK, Paul, let's = review the=20 issue. =20

Compression ratio:

The higher CR WILL ALWAYS result in a lower EGT/TIT if all else = is held=20 constant. Why? Boyle's Law. PV =3D nRT. As the = volume=20 expands, the gas temperature goes down. More expansion; more = temp loss =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 = simplistic=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 and=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 = previous email that a typical cruise fuel flow LOP for the TSIO-550 is = 17.5 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 CRs=20 are more fuel efficient as has been stated by many, well I would expect = to see=20 LIVs equip with those engines cruising at 17.5gph attaining a higher = indicated=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 at AOL.com.=20

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