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X-Virus-Scanned: clean according to Sophos on Logan.com X-PolluStop: No license found, only first 5 messages were scanned Return-Path: <13brv3@bellsouth.net> Received: from imf13aec.mail.bellsouth.net ([205.152.59.61] verified) by logan.com (CommuniGate Pro SMTP 4.3.6) with ESMTP id 1060327 for flyrotary@lancaironline.net; Mon, 18 Jul 2005 22:35:19 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.152.59.61; envelope-from=13brv3@bellsouth.net Received: from ibm61aec.bellsouth.net ([65.6.194.9]) by imf18aec.mail.bellsouth.net with ESMTP id <20050719022736.ULGL11207.imf18aec.mail.bellsouth.net@ibm61aec.bellsouth.net> for ; Mon, 18 Jul 2005 22:27:36 -0400 Received: from rd ([65.6.194.9]) by ibm61aec.bellsouth.net with ESMTP id <20050719022736.QVRR714.ibm61aec.bellsouth.net@rd> for ; Mon, 18 Jul 2005 22:27:36 -0400 From: "Russell Duffy" <13brv3@bellsouth.net> To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EM-2 and fuel flow questions Date: Mon, 18 Jul 2005 21:27:35 -0500 Message-ID: <000501c58c09$6d396740$6101a8c0@rd> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C58BDF.84635F40" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2527 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C58BDF.84635F40 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Yes it matters and the EC2 tries to estimate BSFC if you have an O2 = sensor attached. The BSFC constant in the EC2 is the median at 14.7 : 1. This = is all just my best guesses so don't sue me if you don't get lab grade = results right off the bat. Juggle BSFC factor in the EC2 if you need to.=20 =20 I didn't realize that the EM-2 (I presume you really do mean EM-2, not = EC-2) did that much estimating of the BSFC. I also forgot that the BSFC was = one of the parameters. I got the .55 number from another site, so I guess = it's probably right. I also noticed today that the EM-2 manual lists the = BSFC constant as "best power mixture", but you just said it's at 14.7, so I'm still confused. =20 =20 The calculated HP displayed is based on Fuel flow and calculated BSFC. = The % power is based on calculated HP divided by the max HP factor. If = you rate the engine lower in max HP, you could see more than 100% power displayed. =20 =20 OK, that helps. I used to see more than 100% often. Some of that was = due to the fact that my smaller injectors and uncalibrated fuel flow made it appear that I hade more fuel flow than I did. I also had the max HP = listed at 186, when it's probably at least 200 in the 7k range. I now have the = max HP set at 200, and changed the FF cal constant from 145 to 178 today. = That should get me in the ballpark, and I can start keeping track of fuel to = fine tune it. =20 =20 This is based on a calculation involving how long John is laid up and = unable to fly and how many times I have to sabotage Buly's EC2. :- ))))=20 =20 Great answer :-) =20 Thanks, Rusty (It's always John's fault)=20 ------=_NextPart_000_0006_01C58BDF.84635F40 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Message

Yes it matters and the EC2 tries to estimate = BSFC if=20 you have an O2 sensor attached. The BSFC constant in the EC2 is = the median=20 at 14.7 : 1. This is all just my best guesses so don't sue me if = you don't=20 get lab grade results right off the bat. Juggle BSFC factor in the = EC2 if=20 you need to.

I=20 didn't realize that the EM-2 (I presume you really do mean EM-2, not = EC-2) did=20 that much estimating of the BSFC. I also forgot that the = BSFC was one=20 of the parameters. I got the .55 number from = another site,=20 so I guess it's probably right. I also noticed today that the EM-2 = manual=20 lists the BSFC constant as "best power mixture", but you just = said=20 it's at 14.7, so I'm still confused.

The calculated HP displayed is based on Fuel = flow and=20 calculated BSFC. The % power is based on calculated HP = divided=20 by the max HP factor. If you rate the engine lower in max HP, you = could=20 see more than 100% power displayed.

OK,=20 that helps. I used to see more than 100% often. Some of = that=20 was due to the fact that my smaller injectors and uncalibrated fuel=20 flow made it appear that I hade more fuel flow than I = did. I=20 also had the max HP listed at 186, when it's probably at least 200 in=20 the 7k range. I now have the max HP set at 200, and = changed=20 the FF cal constant from 145 to 178 today. That = should get me in=20 the ballpark, and I can start keeping track of fuel to fine tune=20 it.

This is=20 based on a calculation involving how long John is laid up and unable to = fly and=20 how many times I have to sabotage Buly's EC2. :- ))))

Great answer=20 :-)

Thanks,

Rusty (It's = always John's=20 fault)

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