X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Received: from fed1rmmtao105.cox.net ([68.230.241.41] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 2038223 for flyrotary@lancaironline.net; Fri, 11 May 2007 12:16:39 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.41; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao105.cox.net (InterMail vM.7.05.02.00 201-2174-114-20060621) with ESMTP id <20070511161601.DYIE22040.fed1rmmtao105.cox.net@fed1rmimpo01.cox.net> for ; Fri, 11 May 2007 12:16:01 -0400 Received: from BigAl ([72.192.132.90]) by fed1rmimpo01.cox.net with bizsmtp id xsG11W00B1xAn3c0000000; Fri, 11 May 2007 12:16:01 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: EC2 question Date: Fri, 11 May 2007 08:16:11 -0800 Message-ID: <000501c793e7$b097b810$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0006_01C793A4.A2747810" 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 V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C793A4.A2747810 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable =20 Thanx for the answers. I never doubted Tracy's product, I just want to understand its = operation. Numbers (sold and flying) speak for itself. My question was more to the degree of automation the EC2 provides: Is it necessary to manually (constantly) re-tune mixture or is this automatic, once the base maps are set? Single Lever - "no need to think about" - operation? =20 I think the key word is "necessary". Once the correction tables (maps) = are set; and you set them for mid O2 sensor reading and 12:00 o'clock on the mixture knob; you can fly any part of your regime without doing = anything, and you will be OK (except for when the engine is cold). But for max = power on takeoff and climb you will likely want to run more rich (1:00 - 2:00 o'clock on mixture knob), and for lean cruise you will want to lean = (maybe 10:00 -11:00 o'clock, and mixture monitor off the bottom of the scale). = So, yes; you will probably want to still think about the mixture now and = then. =20 I offer these things based on my system, and somewhat limited flight experience; not as the consummate expert. However, it could be that I = have done more tuning of the engine than anyone because of the issues I had = with the spontaneous changes of settings.:-) =20 Al =20 =20 ------=_NextPart_000_0006_01C793A4.A2747810 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thanx for the answers.

I never doubted Tracy's = product, I just want to understand its operation.

Numbers (sold and flying) speak for = itself.

My question was more to the degree of = automation the EC2 provides:

Is it necessary to manually (constantly) = re-tune mixture or is this automatic, once the base maps are set? Single Lever - "no need to think about" - operation?

I think the key word is = “necessary”. Once the correction tables (maps) are set; and you set them for = mid O2 sensor reading and 12:00 o’clock on the mixture knob; you can fly = any part of your regime without doing anything, and you will be OK (except = for when the engine is cold). But for max power on takeoff and climb you = will likely want to run more rich (1:00 – 2:00 o’clock on mixture = knob), and for lean cruise you will want to lean (maybe 10:00 = -11:00 o’clock, and mixture monitor off the bottom of the scale). So, yes; you = will probably want to still think about the mixture now and = then.

I offer these things based on my = system, and somewhat limited flight experience; not as the consummate = expert. However, it could be that I have done more tuning of the engine than = anyone because of the issues I had with the spontaneous changes of = settings.J

Al

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