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 4155557 for flyrotary@lancaironline.net; Sun, 07 Mar 2010 17:13:16 -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="4.49,599,1262592000"; d="scan'208";a="327591423" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 07 Mar 2010 14:12:10 -0800 Received: from [10.30.20.65] (kunkle2-lxp.hq.netapp.com [10.30.20.65]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id o27MC6nb011874 for ; Sun, 7 Mar 2010 14:12:08 -0800 (PST) Message-ID: <4B9424B4.2070400@nc.rr.com> Date: Sun, 07 Mar 2010 17:12:04 -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] Maxing airspeed References: In-Reply-To: Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Bill Eslick wrote: > > http://www.weslick.com/Prop%20Charts.htm > > Perhaps someone can tell me why I don't see any more power (speed) at > the higher RPM? I suppose Ed will tell me it is due to my intake? Bill, I'd look at the rigging of the airplane. Specifically, how the various lifting surfaces interact. They affect each other, and they affect each other differently at different airspeeds. From your graphs and what I know of other RVs, I would say that there is an interaction between your main wing and tail surface, such that there is a "drag mogul" at around 165mph TAS.