Return-Path: Received: from mailarray.mpx.com.au ([203.29.192.98]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Thu, 17 Dec 1998 07:34:15 -0500 Received: from 198.142.139.174(really [198.142.139.174]) by mailarray.mpx.com.au via smtpd with smtp id for ; Thu, 17 Dec 98 23:35:16 +1100 (/\##/\ Smail3.1.30.13.SOL #30.20 built 28-jun-97) Message-ID: <3678E36D.35CC@mpx.com.au> Date: Thu, 17 Dec 1998 19:56:47 +0900 From: Julie Byrnes Reply-To: byrnes@mpx.com.au Organization: Massive To: lancair.list@olsusa.com Subject: STATIC PRESSURE X-Mailing-List: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Position of the static port is critical. We had erroneous IAS when compared to a calibrated system using a static drogue. It transpired that the static position had been determined by LOOKING at the manual rather than measuring. It was only out by a couple of inches but repositioning as per manual completely corrected the IAS. The cockpit pressure is definately lower than ambient and an alternate cockpit staic source will give an apparent increase of 20Kts and an altitude gain of 200ft (good for showing how fast Your plane goes)! Cheers David Byrnes