X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao08.cox.net ([68.230.241.31] verified) by logan.com (CommuniGate Pro SMTP 4.3.4) with ESMTP id 1008926 for flyrotary@lancaironline.net; Tue, 21 Jun 2005 11:31:59 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.31; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao08.cox.net (InterMail vM.6.01.04.00 201-2131-118-20041027) with ESMTP id <20050621153102.LFN16890.fed1rmmtao08.cox.net@BigAl> for ; Tue, 21 Jun 2005 11:31:02 -0400 From: "Al Gietzen" To: "Rotary motors in aircraft" Subject: Prop balancing Date: Tue, 21 Jun 2005 08:31:15 -0700 Message-ID: <000b01c57676$438c16c0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000C_01C5763B.972D3EC0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_000C_01C5763B.972D3EC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Maybe someone could refresh my memory of a recent discussion on prop balancing. I'm looking into using an accelerometer on the re-drive flange, and oscilloscope read-out. What G-force and frequency range are we talking about? Do you find an RPM of high amplitude and work there. What sort of weights do you put on the prop? I assume placement is amount is trial and error. Does this approach work on a three-blade? Any info on how this is done appreciated Or maybe Rusty has purchased the professional equipment by now and wants to rent it out :-). Al ------=_NextPart_000_000C_01C5763B.972D3EC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Maybe someone could refresh my memory of a recent discussion on prop balancing. I’m looking into using an = accelerometer on the re-drive flange, and oscilloscope read-out. What G-force = and frequency range are we talking about? Do you find an RPM of high amplitude and work there. What sort of weights do you put on the = prop? I assume placement is amount is trial and error. Does this approach = work on a three-blade? Any info on how this is done = appreciated

Or maybe Rusty has purchased the professional = equipment by now and wants to rent it out J.

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