X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wa-out-1112.google.com ([209.85.146.182] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTP id 2079175 for flyrotary@lancaironline.net; Fri, 01 Jun 2007 16:45:55 -0400 Received-SPF: pass receiver=logan.com; client-ip=209.85.146.182; envelope-from=blake.lewis@gmail.com Received: by wa-out-1112.google.com with SMTP id v33so1699892wah for ; Fri, 01 Jun 2007 13:45:19 -0700 (PDT) DKIM-Signature: a=rsa-sha1; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=Vycck0tOPBZ25ynmZDTmJ5LOJsNYkJ4aW0DshBdDsQpJOh1fkzXZZniqktgC++OZY/7oFah/jHLiPmAWNjBla64Ua/IFzmqJMhAUyHrjj7IH3qcpdwxsFHvaWuoni4elfAEPp/4c6J9HSNnO9fCZsCBLW2IvCJ1VP69blmQILR4= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=m9nnj1PPOTLmQ3hAr4JNdocK6WylSIZbYnSXnrWgBkpCybGJB1HS6BuvzMcMo5y9xEMWO2DekIy44gibSEAttgMMRUFyNuM0DouLu7yyqThZtrICrR+sqDgetIa43b6T5O6Ybq0LaDm0f2fLmShPfEz5XLRevl9GjT5jTYF7+wU= Received: by 10.114.130.1 with SMTP id c1mr2205526wad.1180730719128; Fri, 01 Jun 2007 13:45:19 -0700 (PDT) Received: by 10.141.43.4 with HTTP; Fri, 1 Jun 2007 13:45:19 -0700 (PDT) Message-ID: Date: Fri, 1 Jun 2007 15:45:19 -0500 From: "Blake Lewis" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: PP Ve??? was Re: Intake CFM air flow In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Content-Disposition: inline References: It is not wrong I just dropped a digit of the end of the big number. Here is the corrected numbers: 12A Pports can do 310 HP at 10,700 RPM at .667 If the .667 is BSFC then start with that. density of air at sea level 15C = .0765 lbs/cf air/fuel = 12 .667 bsfc x 310hp is 206.77 lbs/hr fuel 206.77lbs x 12 = 2481.24 lbs/hr air 2481.24 lbs/hr / 60min/hr = 41.354 lbs/min (41.354 lbs/min) / (.0765 lbs/cf) * (1728 ci/cf) = 93411 ci /min (934113ci/min) / (10000 rev/min) = 93.41 ci/rev 1300cc / (2.54cm * 2.54cm * 2.54cm)/ci = 79.33 ci volume 93.41ci / 79.33ci = 1.1774 = 117.74 % VE Blake