X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 07 Apr 2008 00:13:36 -0400 Message-ID: X-Original-Return-Path: Received: from yw-out-2324.google.com ([74.125.46.28] verified) by logan.com (CommuniGate Pro SMTP 5.2.1) with ESMTP id 2834974 for lml@lancaironline.net; Sun, 06 Apr 2008 20:04:22 -0400 Received-SPF: pass receiver=logan.com; client-ip=74.125.46.28; envelope-from=akadamson@gmail.com Received: by yw-out-2324.google.com with SMTP id 2so194194ywt.7 for ; Sun, 06 Apr 2008 17:03:42 -0700 (PDT) DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:subject:date:message-id:mime-version:content-type:content-transfer-encoding:x-mailer:x-mimeole:thread-index:sender; b=pp7ujT9AhIKwBT5eRw+iFamkhaR4gaKBQ/PaGRrjFOMM8sEHZlp3tNMX1kk9cIq2xZLI30rYj9mo5zfkL0iDk7NqQKEk21Uqlrw2nQctRVRGB/mEn6bhC1k69LBSsTcedP/wNtIBNv5dNdK/yOM1SBfZG1uqXHYLPPktpXnAkgU= Received: by 10.150.54.6 with SMTP id c6mr2320429yba.112.1207526622551; Sun, 06 Apr 2008 17:03:42 -0700 (PDT) X-Original-Return-Path: Received: from Typhoon ( [76.97.53.219]) by mx.google.com with ESMTPS id 9sm11178262yws.6.2008.04.06.17.03.40 (version=SSLv3 cipher=RC4-MD5); Sun, 06 Apr 2008 17:03:40 -0700 (PDT) From: "Alan K. Adamson" X-Original-To: "'Lancair Mailing List'" Subject: Legacy performance data X-Original-Date: Sun, 6 Apr 2008 20:03:39 -0400 X-Original-Message-ID: <03c401c89842$d626ce30$0501a8c0@highrf.com> 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 V6.00.2900.3198 Thread-Index: AciYQtVqIJaqTkZHTH2GanWsAnUx5Q== X-Original-Sender: Alan Adamson All, We've started to collect a little Legacy performance data... It's not very scientific, and it's not lots of data points, but it does provide a view into the performance options around the Legacy and the various speeds vs. engine vs. airframe combinations. As we continue along, we may get more scientific, but for now it's mostly just fun. Some interesting data points are starting to come to light however. A) flush static ports *seem* to show a slower IAS than actual... Speculation has to do with the laminar flow detaching or creating turbulence aft of the rollbar and moving the static area out away from the fuselage. This speculation is rooted in Andy Chiaveta rear cheek cowl mod that Greg Cole developed for the Legacy. To remedy the issue, in one case, simply putting an aluminum pop-rivet head over the flush sanded static port to move it away from the fuselage has moved the IAS closer to the value it should be for a give TAS. This is a trick that the RV guys learned as they have found similar issues with the RV's in certain airframes. For the shameless plug, some of you bear with me and know that I created a Legacy specific builder forum. I moved it about 3 months ago to my own server where it is much more reliable. It's available for anyone who wants to drop by, it's open for reading and if you'd like to post, just simply register and I'll approve the registration, this just keeps spam away more than anything. Stop by if you like, or if you'd like to see what data we've collected. We are using the 4 way GPS Test Pilot School spreadsheet with some modifications that I create. The links for the main forum is http://www.highrf.com/forums... To see the Legacy specific performance thread, it's http://www.highrf.com/forums/viewtopic.php?f=19&t=278 Enjoy, be safe, and hope to see some of you at SNF... Alan Adamson Atlanta, Ga Still plugging away on Legacy #284