Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Tue, 21 Sep 2004 09:36:52 -0400 Message-ID: X-Original-Return-Path: Received: from mta13.adelphia.net ([68.168.78.44] verified) by logan.com (CommuniGate Pro SMTP 4.2.2) with ESMTP id 423748 for lml@lancaironline.net; Tue, 21 Sep 2004 09:28:19 -0400 Received-SPF: pass receiver=logan.com; client-ip=68.168.78.44; envelope-from=glcasey@adelphia.net Received: from worldwinds ([68.66.216.106]) by mta13.adelphia.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with SMTP id <20040921132747.KKOT9978.mta13.adelphia.net@worldwinds> for ; Tue, 21 Sep 2004 09:27:47 -0400 From: "Gary Casey" X-Original-To: "lancair list" Subject: Re: HUDs X-Original-Date: Tue, 21 Sep 2004 06:21:05 -0700 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) X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Importance: Normal Just as an aside, several years ago I tinkered with a concept for a low-cost HUD. I built a cross-shaped raster of LED's, just like in some CDI's. I then hooked them (through appropriate electronics) to the CDI input for the localizer and glide slope needles. I laid the raster on the dash of my 182 so that it shined up onto the windshield. The reflection was then a CDI indication that could be used to fly an ILS. Of course, it wasn't much if any good in direct sunlight, but the theory was you don't need a HUD on a sunny day. In clouds or at night it worked okay, but there was a double image due to the reflection from both sides of the windshield, a problem I thought that could be cured by adding a selective reflective surface to the inside of the glass. It never went any further than that first successful experiment, but I thought at the time it would be a good aid to an ILS approach. Gary Casey