Return-Path: Received: from [24.25.9.102] (HELO ms-smtp-03-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2883589 for flyrotary@lancaironline.net; Tue, 09 Dec 2003 12:58:50 -0500 Received: from ms-mss-03-ce0-1 ([10.10.1.41]) by ms-smtp-03-eri0.southeast.rr.com (8.12.10/8.12.7) with ESMTP id hB9Hwhxs022391 for ; Tue, 9 Dec 2003 12:58:43 -0500 (EST) Received: from southeast.rr.com (localhost [127.0.0.1]) by ms-mss-03.southeast.rr.com (iPlanet Messaging Server 5.2 HotFix 1.12 (built Feb 13 2003)) with ESMTP id <0HPN00HIK39UXU@ms-mss-03.southeast.rr.com> for flyrotary@lancaironline.net; Tue, 09 Dec 2003 12:58:42 -0500 (EST) Received: from [10.10.1.23] by ms-mss-03.southeast.rr.com (mshttpd); Tue, 09 Dec 2003 12:58:42 -0500 Date: Tue, 09 Dec 2003 12:58:42 -0500 From: echristley@nc.rr.com Subject: Re: [FlyRotary] Re: Air Density at altitude To: Rotary motors in aircraft Reply-to: echristley@nc.rr.com Message-id: <16fd0216e860.16e86016fd02@southeast.rr.com> MIME-version: 1.0 X-Mailer: iPlanet Messenger Express 5.2 HotFix 1.12 (built Feb 13 2003) Content-type: text/plain; charset=us-ascii Content-language: en Content-transfer-encoding: 7BIT Content-disposition: inline X-Accept-Language: en Priority: normal X-Virus-Scanned: Symantec AntiVirus Scan Engine ----- Original Message ----- From: Ed Anderson Date: Tuesday, December 9, 2003 12:32 pm Subject: [FlyRotary] Re: Air Density at altitude > Heat transfer equation Q =W*DeltaT*Cp, with W = mass flow down > by 30%. So to get rid of the same Q of heat (and since Cp doesn't > change that much) it would appear that means the delta T term > would need to increase by 30% for Q quantity to remain the same. > But, I don't know exactly how a 79Deg colder incoming air would > affect the Delta T term. > > BIll?? > > Ed Anderson > Wouldn't the percentage change in DeltaT (DeltaDeltaT?) have to be measured from absolute 0? An 80degree change would then represent...what?... about 20%?