X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.73] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.3) with ESMTP id 861592 for flyrotary@lancaironline.net; Sat, 03 Dec 2005 00:51:11 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.73; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Fri, 2 Dec 2005 21:50:26 -0800 Message-ID: Received: from 4.174.2.213 by BAY115-DAV1.phx.gbl with DAV; Sat, 03 Dec 2005 05:50:26 +0000 X-Originating-IP: [4.174.2.213] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Turbo Surge? Date: Sat, 3 Dec 2005 00:50:23 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0067_01C5F7A3.8ADF7F40" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Sat, 3 Dec 2005 00:50:23 -0500 X-OriginalArrivalTime: 03 Dec 2005 05:50:26.0869 (UTC) FILETIME=[75EC1650:01C5F7CD] This is a multi-part message in MIME format. ------=_NextPart_000_0067_01C5F7A3.8ADF7F40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Have you looked at the EC2 MAP table up at the high end using the EM2? = Make sure that there are no holes in the table up at that point. I = would suggest putting the EM2 in map display and invoke Track Mode so = that the display follows where the engine is actually running.=20 Tracy ----- Original Message -----=20 From: Bartrim, Todd=20 To: Rotary motors in aircraft=20 Sent: Friday, December 02, 2005 5:16 PM Subject: [FlyRotary] Turbo Surge? I think I experienced a small amount of turbo surge during my last = flight. It was only evident when MAP was between ~ 0 & 0.5 psi boost. A = small change in throttle position in either direction would eliminate = it. It sounded & acted almost identical to the way that the engine would = previously act when positioned precisely at the injector staging point. = But my staging point is at ~ 18"Hg and I have that well tuned now so as = not to cause a problem.=20 So my question is aimed at those with greater knowledge and = experience in this area. What exactly does turbo surge feel like? What = are the symptoms? Is it likely that what I was experiencing was just = tuning related? I do have the TurboSmart electronic boost controller, = but since I hadn't played with it since last year, I didn't want to make = any adjustments without taking another look at the instruction book = again, but I doubt that it was related. Todd ------=_NextPart_000_0067_01C5F7A3.8ADF7F40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Have you looked at the EC2 MAP table up at the high end using the=20 EM2? Make sure that there are no holes in the table up at = that=20 point. I would suggest putting the EM2 in map display and invoke = Track=20 Mode so that the display follows where the engine is actually=20 running.

Tracy

----- Original Message -----

From: Bartrim, Todd

To: Rotary motors in = aircraft

Sent: Friday, December 02, 2005 = 5:16=20 PM

Subject: [FlyRotary] Turbo = Surge?

I = think I=20 experienced a small amount of turbo surge during my last flight. It = was only=20 evident when MAP was between ~ 0 & 0.5 psi boost. A = small change=20 in throttle position in either direction would eliminate it. It = sounded=20 & acted almost identical to the way that the engine would = previously act=20 when positioned precisely at the injector staging point. But my = staging point=20 is at ~ 18"Hg and I have that well tuned now so as not to cause a = problem.=20

So my question is aimed at those with greater knowledge = and=20 experience in this area. What exactly does turbo surge feel like? What = are the=20 symptoms? Is it likely that what I was experiencing was just tuning = related? I=20 do have the TurboSmart electronic boost controller, but since I hadn't = played=20 with it since last year, I didn't want to make any adjustments without = taking=20 another look at the instruction book again, but I doubt that it was=20 related.

Todd

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