Return-Path: Received: from blv-smtpout-01.boeing.com ([192.161.36.5]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-64832U3500L350S0V35) with ESMTP id com for ; Tue, 10 Oct 2000 11:02:23 -0400 Received: from blv-av-01.boeing.com ([192.54.3.60]) by blv-smtpout-01.boeing.com (8.9.2/8.8.5-M2) with ESMTP id IAA21917 for ; Tue, 10 Oct 2000 08:09:31 -0700 (PDT) Received: from blv-hub-01.boeing.com (localhost [127.0.0.1]) by blv-av-01.boeing.com (8.9.3/8.9.2) with ESMTP id IAA10273 for ; Tue, 10 Oct 2000 08:09:30 -0700 (PDT) Received: from xch-mwbh-01.stl.mo.boeing.com by blv-hub-01.boeing.com with ESMTP for lancair.list@olsusa.com; Tue, 10 Oct 2000 08:09:09 -0700 Received: by xch-mwbh-01.mdc.com with Internet Mail Service (5.5.2650.21) id <4Q265JXY>; Tue, 10 Oct 2000 10:09:08 -0500 Message-Id: <417BA1959096D211BF270008C7A4375A038C8BA3@xch-stl-02.mdc.com> From: "Field, Peter B" To: "'lancair.list@olsusa.com'" Subject: RE: Hard Landing Date: Tue, 10 Oct 2000 10:09:05 -0500 X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> My condolences also to Hal on banging up his baby. Brent Regan's discussion is on mark. I second the recommendation of "Aerodynamics For Naval Aviators" also known as the Green Book (because of it's cover). Stall speed (in knots, TAS) of an aircraft in level flight can be expressed by the equation: Vs = 17.2 (the square root of [Weight / Clmax x altitude density ratio x wing surface area]) If you are right on the ragged edge, say, within 2-4 knots of stall, and also in turbulence you are asking for surprises. There are such things as sink holes and rises due to ground heating and a whole host of other atmospheric phenomena on the glide slope. You have to have enough excess lift available to cope with them. An angle of attack sensor takes into account all the variables expressed in the equation above. If you're going to use the airspeed indicator alone insure you add 5 or so knots if there's turbulence and calculate your stall speed for high altitude, hot day airports. You can back out a pretty good Clmax term from your stall investigations during initial flight tests (be sure to convert your IAS to TAS). Brent, no hammer from this former NA, I think all Lancairs qualify as high performance aircraft, especially in the landing configuration. Regards to the forum, Pete >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>