Return-Path: Received: from hil-img-7.compuserve.com ([149.174.177.137]) by truman.olsusa.com (Post.Office MTA v3.5.1 release 219 ID# 0-52269U2500L250S0V35) with ESMTP id com for ; Fri, 1 Jan 1999 20:12:36 -0500 Received: (from root@localhost) by hil-img-7.compuserve.com (8.8.6/8.8.6/2.17) id UAA16646; Fri, 1 Jan 1999 20:13:55 -0500 (EST) Date: Fri, 1 Jan 1999 20:13:01 -0500 From: Lynda Frantz Subject: IV stall characteristics Sender: Lynda Frantz To: "INTERNET:lancair.list@olsusa.com" , Robert E Froelich , Charley Kohler Message-ID: <199901012013_MC2-653B-1B86@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 >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> Another excellent reference for stall characteristics of the IV is from Bob Froelich at refroelich@juno.com. Bob documented the stall chararacteristics on video tape, with a tuffed wing, using our AOA Professional instrument to gauge angle-of-attack in every configuration. Bob is the only one to have documented the stall characteristics of the IV in the real world of flight that I am aware of. Bob's data shows a nicely behaved stall that developes inboard on the flaps and works it way forward and towards the tips. Another source is LNN p. 414 on Stall/ Spins and secondary stalls by Charlie Kohler. Charlie advises avoiding deep stalls in IV's. The Washington State Lancair-IV Pilot Association may be doing some Lancair-IV research into stalls, laminar flow, and laminar separation in 1999. Of course we will report any thing of interest in the Lancair Network News. According to the NTSB data base, Stall/spins account for 45.3% of Experimental Aircraft fatalities. Note that stalls or approach to stalls under controlled conditions are not necessarily anything like an unintentional stall occuring at low altitude in a high work load environment. The approach to stalls performed at high altitude with perfect entry, coordination and recovery that you experienced in your bi-annual may not be anything like the unexpected real thing! Jim Frantz Lancair Network News www.angle-of-attack.com