Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Tue, 21 Dec 2004 23:30:20 -0500 Message-ID: X-Original-Return-Path: Received: from mta11.adelphia.net ([68.168.78.205] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 576249 for lml@lancaironline.net; Tue, 21 Dec 2004 23:05:47 -0500 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.205; envelope-from=glcasey@adelphia.net Received: from worldwinds ([70.32.213.236]) by mta11.adelphia.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with SMTP id <20041222040518.QNPP1403.mta11.adelphia.net@worldwinds> for ; Tue, 21 Dec 2004 23:05:18 -0500 From: "Gary Casey" X-Original-To: "lancair list" Subject: airspeed vs. power X-Original-Date: Tue, 21 Dec 2004 19:52:11 -0800 X-Original-Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook IMO, Build 9.0.2416 (9.0.2910.0) Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 <<19.7" MAP, 7.3 gph, 157 IAS, -5C OAT, 189 TAS, -9C TAT 18.7 " MAP, 6.9 gph, 154 IAS, -6C OAT, 186 TAS, -10C TAT>> Now this data I believe. MAP isn't an exact measure of power, but if you subtract maybe 4 inches from the numbers it is pretty close. The fuel flow isn't either, but it is probably close. Assuming the normally accepted cube root theory the following is expected: 1. Using the MAP as-is the airspeed should have changed 1.7% 2. Using MAP - 4 inches the airspeed should have changed 2.2% 3. Using fuel flow directly the airspeed should have change 1.9% It actually changed 1.95%, well within any reasonable experimental error. Gary Casey