X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from sj-iport-5.cisco.com ([171.68.10.87] verified) by logan.com (CommuniGate Pro SMTP 5.1.10) with ESMTP id 2198636 for flyrotary@lancaironline.net; Wed, 25 Jul 2007 12:59:55 -0400 Received-SPF: softfail receiver=logan.com; client-ip=171.68.10.87; envelope-from=echristley@nc.rr.com Received: from sj-dkim-4.cisco.com ([171.71.179.196]) by sj-iport-5.cisco.com with ESMTP; 25 Jul 2007 09:59:10 -0700 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: Ao8CAIkdp0arR7PE/2dsb2JhbAA X-IronPort-AV: i="4.16,581,1175497200"; d="scan'208"; a="168131103:sNHT25660881" Received: from sj-core-5.cisco.com (sj-core-5.cisco.com [171.71.177.238]) by sj-dkim-4.cisco.com (8.12.11/8.12.11) with ESMTP id l6PGxAIn030343 for ; Wed, 25 Jul 2007 09:59:10 -0700 Received: from xbh-rtp-201.amer.cisco.com (xbh-rtp-201.cisco.com [64.102.31.12]) by sj-core-5.cisco.com (8.12.10/8.12.6) with ESMTP id l6PGwbSn015314 for ; Wed, 25 Jul 2007 16:59:10 GMT Received: from xfe-rtp-202.amer.cisco.com ([64.102.31.21]) by xbh-rtp-201.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 12:59:04 -0400 Received: from [64.102.38.160] ([64.102.38.160]) by xfe-rtp-202.amer.cisco.com with Microsoft SMTPSVC(6.0.3790.1830); Wed, 25 Jul 2007 12:59:03 -0400 Message-ID: <46A7815F.6070201@nc.rr.com> Date: Wed, 25 Jul 2007 12:59:11 -0400 From: Ernest Christley Reply-To: echristley@nc.rr.com User-Agent: Thunderbird 1.5.0.10 (X11/20070403) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Exhaust scavenging effect? References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-OriginalArrivalTime: 25 Jul 2007 16:59:03.0769 (UTC) FILETIME=[1AE57C90:01C7CEDD] Authentication-Results: sj-dkim-4; header.From=echristley@nc.rr.com; dkim=neutral Russell Duffy wrote: > Greetings, > > With all the talk of single rotor power levels, everyone seems to > be assuming that we'll get half of what a 2 rotor gets for HP. One > thing that we lose with the single rotor is the scavenging effect that > can be gained from the exhaust flow of the other rotor. How much of a > HP loss is this? Each rotor should be able to scavenge itself, shouldn't it?