X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mx2.netapp.com ([216.240.18.37] verified) by logan.com (CommuniGate Pro SMTP 5.3.3) with ESMTPS id 4152596 for flyrotary@lancaironline.net; Thu, 04 Mar 2010 16:59:23 -0500 Received-SPF: softfail receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@nc.rr.com X-IronPort-AV: E=Sophos;i="4.49,583,1262592000"; d="scan'208";a="326360443" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 04 Mar 2010 13:58:47 -0800 Received: from [10.62.16.80] (ernestc-laptop.hq.netapp.com [10.62.16.80]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id o24LwlWa004328 for ; Thu, 4 Mar 2010 13:58:47 -0800 (PST) Message-ID: <4B902D17.20601@nc.rr.com> Date: Thu, 04 Mar 2010 16:58:47 -0500 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 2.0.0.23 (X11/20090817) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Vance Jaqua and Propellers References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: quoted-printable Ed Anderson wrote: > > I certainly don=92t claim nor believe I understand props =96 I just go = to=20 > a reliable prop manufacture and tell told him what I had and what I=20 > wanted. When I originally got my 76x88 prop, I decided I wanted 200=20 > more engine rpm and that is all I told Clark Lydic and he cut off an=20 > 2=94 off the diameter and I got my 200 rpm increase. Could have been=20 > just lucky, but a good prop guy can give you the right prop =96 IF you = > give him the right information. > The library section of my website I have a document call "How I Make=20 Prop" (or something like that). The author's rule of thumb was that 1"=20 off the prop tip will increase RPM by 100. Real world confirmation of rules of thumb cause me to giggle like a=20 little girl.