Return-Path: Received: from arl-img-3.compuserve.com ([149.174.217.133]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Sun, 28 Feb 1999 01:14:59 -0500 Received: (from mailgate@localhost) by arl-img-3.compuserve.com (8.8.6/8.8.6/2.18) id BAA03854 for lancair.list@olsusa.com; Sun, 28 Feb 1999 01:16:50 -0500 (EST) Date: Sun, 28 Feb 1999 01:16:32 -0500 From: Lynda Frantz Subject: radar altimiters Sender: Lynda Frantz To: "INTERNET:lancair.list@olsusa.com" Message-ID: <199902280116_MC2-6C20-8C3A@compuserve.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Disposition: inline X-Mailing-List: lancair.list@olsusa.com <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Message text written by INTERNET:lancair.list@olsusa.com >has anyone had any experience using a radar altimeter as a landing gear up warning? I have heard that some have altitude alarms that you can set. how reliable are they? any information on them and pro's and con's would be appreciated.< My Dad invented the radar altimiter while working for RCA during WWII. Generally the RA alarm you mentioned is used for minimums annunciators for CAT II and III approaches and auto landings. I suspect that you would get occasional false gear warnings due to the fact that when ever you fly over another aircraft the RA would measure a brief low RA unless it was filtered to eliminate these brief alerts. The AOA Professional includes a gear warner which is based on airspeed and works nice. This single istrument provides the best L/D, max endurance, best engine out glide, stall warnings, best approach AOA, critical AOA and a gear warner all for much less $$ than a RA. Jim Frantz Jim@angle-of-attack.com