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 5.4c2o) with ESMTPS id 4874017 for flyrotary@lancaironline.net; Thu, 17 Feb 2011 14:42:19 -0500 Received-SPF: none receiver=logan.com; client-ip=216.240.18.37; envelope-from=echristley@att.net X-IronPort-AV: E=Sophos;i="4.62,182,1297065600"; d="scan'208";a="519791659" Received: from smtp1.corp.netapp.com ([10.57.156.124]) by mx2-out.netapp.com with ESMTP; 17 Feb 2011 11:41:42 -0800 Received: from [10.62.16.200] (ernestc-laptop.hq.netapp.com [10.62.16.200]) by smtp1.corp.netapp.com (8.13.1/8.13.1/NTAP-1.6) with ESMTP id p1HJfgJd009501 for ; Thu, 17 Feb 2011 11:41:42 -0800 (PST) Message-ID: <4D5D79F1.3040704@att.net> Date: Thu, 17 Feb 2011 14:41:37 -0500 From: Ernest Christley Reply-To: echristley@att.net User-Agent: Thunderbird 2.0.0.24 (X11/20100623) MIME-Version: 1.0 To: Rotary motors in aircraft Subject: Re: [FlyRotary] Re: Pressure increase from ram air References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Tracy wrote: > Yes, 2" of Hg, but that was at top speed when racing (224 mph), not > cruise. My ram air inlet is about 1" behind the prop which may affect > the amount. > That's good enough. I'm rerunning the calculations that I did to find out how much power increase I can get from the blower I built, now that I'm done building it and can get the final measurements. I work like Congress. I had to build it, before I could measure it. The inlet stagnation pressure has some effect on the outcome, but not much. My conservative estimate with what I have is that Pout/Pin=1.044. This should translate to somewhere around an 8hp increase.