Return-Path: Sender: (Marvin Kaye) To: lml@lancaironline.net Date: Sun, 28 Mar 2004 21:51:47 -0500 Message-ID: X-Original-Return-Path: Received: from [68.89.254.181] (HELO sdf1.mail.taturbo.com) by logan.com (CommuniGate Pro SMTP 4.2b1) with ESMTP id 3132241 for lml@lancaironline.net; Sun, 28 Mar 2004 20:46:37 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C4152F.D4BA5426" Subject: RE: [LML] Re: relative temps? A more technical exchange. content-class: urn:content-classes:message X-MimeOLE: Produced By Microsoft Exchange V6.0.6487.1 X-Original-Date: Sun, 28 Mar 2004 19:47:44 -0600 X-Original-Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: [LML] Re: relative temps? A more technical exchange. Thread-Index: AcQVI6AvrEZ6WGiqSLGcJTVm1oHgGwACeErA From: "George Braly" X-Original-To: "Lancair Mailing List" This is a multi-part message in MIME format. ------_=_NextPart_001_01C4152F.D4BA5426 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable <<<<<<>>>>>>> =20 > I can buy that. What about torque? < =20 Same . At constant RPM, Hp is directly proportional to torque. A = 1% change in Hp =3D to a 1% change in torque - - at constant RPM - - as = in 2700 for takeoff. =20 =20 **************************** =20 =20 <<<<>>>>> =20 > As I said in the post you are responding to, 1280-1290 and 15.4 gph. = Note that the fuel flow could be less than accurate. After a long = flight, the EPI totalizer will claim I used about 5% more fuel than that = measured by those very accurate fill-up trucks (this includes same truck = at the same airport on the same day). Of course, that was not flown at = WOT. However, I will record more environmental data (Baro, Palt, OAT) = when I collect this information next time, including WOT lo altitude = runs with and w/o LASAR. =20 Thanks for keeping at this, < =20 is the 1280 EGT at takeoff on the LASAR or on the Magnetos ??? =20 =20 1280-1290 @ 15.4 gph or 90 pph or (assuming 160 Hp) at a BSFC of about = 0.56 (90/160 =3D 0.56). 1280 sounds ** about ** right at full = power for that BSFC at 25d timing, so maybe the sparks at full power and = are not being advanced past 25d. BTW... I much prefer about 0.6 BSFC = on these engines for normally aspirated full power operation - - = especially at 25d timing.=20 =20 The 9:1 pistons would cause the EGTs to be a bit lower than stock = engines. =20 Regards, George =20 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.595 / Virus Database: 378 - Release Date: 2/25/2004 =20 ------_=_NextPart_001_01C4152F.D4BA5426 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

<<<<<<<At high power = ...=20 changing the spark timing over a range of plus/minus
3 or = 4=20 degrees off of Max Brake Torque (MBT) timing has = remarkably
SMALL=20 effects on Hp. Almost unnoticeable to a=20 pilot.
>>>>>>>>

> I can buy = that. What about torque?   <

Same .   At constant = RPM, =20 Hp is directly proportional to torque.    A 1% change = in Hp =3D=20 to a 1% change in torque - - at constant RPM - - as in 2700 for=20 takeoff.

****************************

<<<<<What do your EGTs run at full power on take = off=20 ?   At what fuel flow?
>>>>>>

> As I said = in the=20 post you are responding to, 1280-1290 and 15.4 gph. Note that = the fuel=20 flow could be less than accurate. After a long flight, the EPI = totalizer=20 will claim I used about 5% more fuel than that measured by those very = accurate=20 fill-up trucks (this includes same truck at the same airport on the = same=20 day). Of course, that was not flown at WOT. However, I = will record=20 more environmental data (Baro, Palt, OAT) when I collect this = information=20 next time, including WOT lo altitude runs with and w/o = LASAR.

Thanks for keeping at this, <

is the 1280 EGT at takeoff on = the LASAR or=20 on the Magnetos ???

1280-1290 @ 15.4 gph or 90 pph = or=20 (assuming 160 Hp) at a BSFC of about 0.56 (90/160 =3D=20 0.56).        1280 = sounds **=20 about ** right at full power for that BSFC at 25d = timing, so=20 maybe the sparks at full power and are not being advanced past=20 25d.   BTW... I much prefer about 0.6 BSFC on these engines = for=20 normally aspirated full power operation - - especially at 25d=20 timing.

The 9:1 pistons would cause the = EGTs to=20 be a bit lower than stock engines.

Regards, = George

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