Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Sat, 12 Oct 2002 18:48:08 -0400 Message-ID: X-Original-Return-Path: Received: from cpimssmtpu09.email.msn.com ([207.46.181.84] verified) by logan.com (CommuniGate Pro SMTP 4.0b9) with ESMTP id 1804090 for flyrotary@lancaironline.net; Sat, 12 Oct 2002 16:22:46 -0400 Received: from bhickman ([65.137.50.69]) by cpimssmtpu09.email.msn.com with Microsoft SMTPSVC(5.0.2195.4905); Sat, 12 Oct 2002 13:21:30 -0700 X-Original-Message-ID: <000b01c2722e$43e5f040$284ffea9@suwanneevalley.net> Reply-To: "Tracy Crook" From: "Tracy Crook" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: dynamic balancing X-Original-Date: Sat, 12 Oct 2002 16:30:52 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Original-Return-Path: lors01@msn.com X-OriginalArrivalTime: 12 Oct 2002 20:21:30.0716 (UTC) FILETIME=[F36141C0:01C2722C] > Be advised that just ballancing > > the prop end to end is a waste of time. It must be ballanced chord-wise > as > > wel, and this is where I have seen the biggest imballance. > > > > Tracy > > Tracy, what kind of a fixture do you use to balance chord-wise? I have a > shaft on bearings for span wise but can't visualise doing it in the other > direction. > Peter > I machined a cone in a dowl that is a light press fit in the center hole of the prop. I then ballance the prop on a pointed rod (held vertical in a vise) in the center of the machined cone. A sensitive round bubble level (like those on a transit) indicates the direction and amount of imballance. I use weights rivited to the spinner backing plate to ballance the whole assembly. Tracy >