X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Wed, 09 Dec 2009 14:34:48 -0500 Message-ID: X-Original-Return-Path: Received: from mta21.charter.net ([216.33.127.81] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 4012231 for lml@lancaironline.net; Wed, 09 Dec 2009 12:37:02 -0500 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.81; envelope-from=farnsworth@charter.net Received: from imp10 ([10.20.200.10]) by mta21.charter.net (InterMail vM.7.09.02.04 201-2219-117-106-20090629) with ESMTP id <20091209173629.XXGW21519.mta21.charter.net@imp10> for ; Wed, 9 Dec 2009 12:36:29 -0500 Received: from Farnsworth ([75.139.158.86]) by imp10 with smtp.charter.net id F5cL1d0041s7vFP055cSn5; Wed, 09 Dec 2009 12:36:28 -0500 X-Authority-Analysis: v=1.0 c=1 a=1HsweZ21yl14qZ6TNZQA:9 a=x3LaQLTLrJCFjLG-JEFSHK2Bz9MA:4 From: "farnsworth" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Re: Vne discussion X-Original-Date: Wed, 9 Dec 2009 12:36:24 -0500 X-Original-Message-ID: <1F13E9D3BDC34DC986D5D539B33A9FBA@Farnsworth> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Mailer: Microsoft Office Outlook 11 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Thread-Index: Acp48b76deuJzmEcR/qtnOJPyYoX+gAAywaw In-Reply-To: David, "0.57mach i.e. .57 x 761=433 mph Tas or 382 kTas. is this correct?" Mach is a function of temperature. The warmer the temperature the faster the speed of sound. The 761 MPH you referenced is for a temperature of 59 degrees F or 15 degrees C. Since temperature decreases as altitude increases the speed of sound will be less at altitude. Lynn Farnsworth Super Legacy #235 TSIO-550 Powered Race #44 Mmo .6 Mach