X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [64.253.156.46] (HELO canformail1.canfor.ca) by logan.com (CommuniGate Pro SMTP 5.0.3) with ESMTP id 861033 for flyrotary@lancaironline.net; Fri, 02 Dec 2005 17:17:26 -0500 Received-SPF: none receiver=logan.com; client-ip=64.253.156.46; envelope-from=Steve.Bartrim@canfor.com X-MimeOLE: Produced By Microsoft Exchange V6.5.7226.0 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C5F78E.0C8AECE0" Subject: Turbo Surge? Date: Fri, 2 Dec 2005 14:16:31 -0800 Message-ID: <091A2D42FAF91A41B84750D269FC97E72B31D3@canformail1.canfor.ca> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: Turbo Surge? Thread-Index: AcX3jgyGNKZ8Zz0bTvmBY1KlmtF4Cw== From: "Bartrim, Todd" To: "Rotary motors in aircraft" This is a multi-part message in MIME format. ------_=_NextPart_001_01C5F78E.0C8AECE0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable 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. =20 Todd ------_=_NextPart_001_01C5F78E.0C8AECE0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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 is=20 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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