Return-Path: Sender: (Marvin Kaye) To: flyrotary Date: Tue, 15 Oct 2002 19:14:40 -0400 Message-ID: X-Original-Return-Path: Received: from cpimssmtpu03.email.msn.com ([207.46.181.79] verified) by logan.com (CommuniGate Pro SMTP 4.0b9) with ESMTP id 1806162 for flyrotary@lancaironline.net; Tue, 15 Oct 2002 17:30:16 -0400 Received: from bhickman ([65.137.51.121]) by cpimssmtpu03.email.msn.com with Microsoft SMTPSVC(5.0.2195.4617); Tue, 15 Oct 2002 14:28:58 -0700 X-Original-Message-ID: <00fb01c27493$34751ca0$284ffea9@suwanneevalley.net> Reply-To: "Tracy Crook" From: "Tracy Crook" X-Original-To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: chordwise balancing X-Original-Date: Tue, 15 Oct 2002 17:38:28 -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: 15 Oct 2002 21:28:59.0129 (UTC) FILETIME=[DFA94E90:01C27491] > > > 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 > > So does the flat surface of the cone get pressed in past the surface of the > prop so that the point of contact is inside the hole to give some stability? > Thanks for clarifying this > Peter > Not sure I understand the question but the top of the cone (It is a concave cone BTW) where the point of the rod goes should be positioned slightly above the CG of the prop/spinner, etc. Tracy >