X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Mon, 16 Apr 2012 20:55:46 -0400 Message-ID: X-Original-Return-Path: Received: from imr-da01.mx.aol.com ([205.188.105.143] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5483039 for lml@lancaironline.net; Mon, 16 Apr 2012 08:50:23 -0400 Received-SPF: pass receiver=logan.com; client-ip=205.188.105.143; envelope-from=Sky2high@aol.com Received: from mtaomg-mb04.r1000.mx.aol.com (mtaomg-mb04.r1000.mx.aol.com [172.29.41.75]) by imr-da01.mx.aol.com (8.14.1/8.14.1) with ESMTP id q3GCnj9Z030161 for ; Mon, 16 Apr 2012 08:49:45 -0400 Received: from core-mtd002b.r1000.mail.aol.com (core-mtd002.r1000.mail.aol.com [172.29.235.197]) by mtaomg-mb04.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 02031E000085 for ; Mon, 16 Apr 2012 08:49:45 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <2fcf8.7d65ff15.3cbd6f68@aol.com> X-Original-Date: Mon, 16 Apr 2012 08:49:44 -0400 (EDT) Subject: Re: [LML] Fw: L320 flap setting X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_2fcf8.7d65ff15.3cbd6f68_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:475677056:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d294b4f8c15693838 --part1_2fcf8.7d65ff15.3cbd6f68_boundary Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en Wolfgang, =20 Regardless of what the NASA report says, they never flew the wing as =20 implemented by Lancair. Extension of the flap more than a few degrees bey= ond 0=20 does little for lift. The pitching moment does change the attitude, but= =20 does not significantly change the stall speed (a few knots is not =20 significant). The drag addition is significant. The AOA is another story= . While the=20 attitude changes with flap extension, the AOA is still high and slower=20 speeds just brings one closer to a stall, thus reducing margins to take ca= re=20 of loss of pilot attention, wind shear, distractions and anything that lea= ds=20 to mis-application of up elevator with pitch sensitive controls. It is=20 very easy to reach critical AOA at slow speeds, with or without=20 flaps.............. =20 Scott Krueger=20 =20 =20 In a message dated 4/16/2012 7:20:08 A.M. Central Daylight Time, =20 Wolfgang@MiCom.net writes: -7 to -10 isn't going to make much difference in flight. If the latest=20 manual says to use -7 then go for it. =20 The purpose of reflex flaps is to reduce drag (lets you go faster) while= =20 giving up some lift coefficient. At higher speeds you don't need that extr= a=20 lift coefficient. Reflex will also move the center of lift forward causing a nose up force= =20 affecting the trim needs. =20 For landing, you give extra flap to increase the lift coefficient (and the= =20 drag) so you can go slower without falling out of the sky. =20 See attached file for more details. =20 Wolfgang =20 =20 ----- Original Message ----- =20 From: _Ed Gray_ (mailto:egraylaw@swbell.net) =20 To: _lml@lancaironline.net_ (mailto:lml@lancaironline.net) =20 Sent: Saturday, April 14, 2012 12:01 AM Subject: L320 flap setting I have the exact concerns reported by Rob Stevens in Australia. Since the= =20 manual is vague on cruise flap settings, can some experienced L320-360=20 fliers help us with what is the best cruise settings? Is it -7deg. , -10d= eg.,=20 or somewhere else. Since construction variances can create different =E2= =80=9C faired-in positions=E2=80=9D, is there an angle which can be measured from= the top or=20 bottom wing surface? Can anyone explain the aerodynamic reasons for=20 reflexed flaps? Rob and I need help!=20 Ed Gray Dallas L360 N77ZG XP360 Silver Hawk injection MT 3 blade prop=20 Dual Dynon Skyview SL30 -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l --part1_2fcf8.7d65ff15.3cbd6f68_boundary Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Content-Language: en
Wolfgang,
 
Regardless of what the NASA report says, they never flew the wing as= =20 implemented by Lancair.  Extension of the flap more than a few degrees= =20 beyond 0 does little for lift.  The pitching moment does change the=20 attitude, but does not significantly change the stall speed (a few knots is= not=20 significant).  The drag addition is significant.  The AOA is anot= her=20 story.  While the attitude changes with flap extension, the AOA is sti= ll=20 high and slower speeds just brings one closer to a stall, thus reducing mar= gins=20 to take care of loss of pilot attention, wind shear, distractions and anyth= ing=20 that leads to mis-application of up elevator with pitch sensitive=20 controls.  It is very easy to reach critical AOA at slow speeds, with = or=20 without flaps..............
 
Scott Krueger 
 
In a message dated 4/16/2012 7:20:08 A.M. Central Daylight Time,=20 Wolfgang@MiCom.net writes:
=
-7 to -10 isn't going to make much diffe= rence in=20 flight. If the latest manual says to use -7 then go for it.
 
The purpose of reflex flaps is to reduce= drag=20 (lets you go faster) while giving up some lift coefficient. At higher spe= eds=20 you don't need that extra lift coefficient.
Reflex will also move the center of lift= forward=20 causing a nose up force affecting the trim needs.
 
For landing, you give extra flap to incr= ease the=20 lift coefficient (and the drag) so you can go slower without falling out = of=20 the sky.
 
See attached file for more details.
 
Wolfgang
 
 
----- Original Message -----=20
From: Ed= Gray=20
Sent: Saturday, April 14, 2012 12:01 AM
Subject: L320 flap setting

I have the exact con= cerns=20 reported by Rob Stevens in Australia.  Since the manual is vague on= =20 cruise flap settings, can some experienced L320-360 fliers help us with w= hat=20 is the best cruise settings?  Is it -7deg. , -10deg., or somewhere= =20 else.  Since construction variances can create different =E2=80=9Cfa= ired-in=20 positions=E2=80=9D, is there an angle which can be measured from the top = or bottom=20 wing surface?  Can anyone explain the aerodynamic reasons for reflex= ed=20 flaps?  Rob and I need help!

Ed Gray Dallas = L360=20 N77ZG XP360 Silver Hawk injection MT 3 blade prop Dual Dynon Skyview=20 SL30



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