X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 17 Apr 2012 16:54:35 -0400 Message-ID: X-Original-Return-Path: Received: from imr-ma04.mx.aol.com ([64.12.206.42] verified) by logan.com (CommuniGate Pro SMTP 5.4.4) with ESMTP id 5485194 for lml@lancaironline.net; Tue, 17 Apr 2012 10:31:43 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.42; envelope-from=Sky2high@aol.com Received: from mtaomg-mb01.r1000.mx.aol.com (mtaomg-mb01.r1000.mx.aol.com [172.29.41.72]) by imr-ma04.mx.aol.com (8.14.1/8.14.1) with ESMTP id q3HEUueQ005471 for ; Tue, 17 Apr 2012 10:30:56 -0400 Received: from core-mtd002b.r1000.mail.aol.com (core-mtd002.r1000.mail.aol.com [172.29.235.197]) by mtaomg-mb01.r1000.mx.aol.com (OMAG/Core Interface) with ESMTP id 8C57BE00008C for ; Tue, 17 Apr 2012 10:30:56 -0400 (EDT) From: Sky2high@aol.com X-Original-Message-ID: <43a80.7114f03e.3cbed8a0@aol.com> X-Original-Date: Tue, 17 Apr 2012 10:30:56 -0400 (EDT) Subject: Re: [LML] Re: Fw: L320 flap setting X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_43a80.7114f03e.3cbed8a0_boundary" X-Mailer: AOL 9.6 sub 168 X-Originating-IP: [67.175.156.123] x-aol-global-disposition: G X-AOL-SCOLL-SCORE: 0:2:414271360:93952408 X-AOL-SCOLL-URL_COUNT: 0 x-aol-sid: 3039ac1d29484f8d7ea016b9 --part1_43a80.7114f03e.3cbed8a0_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Chris, Ahh, too bad I can't translate Reynolds numbers into KIAS. I thought the NASA airfoil tests were at slow speeds???? Oh well .. It does match my experience. At high speeds, flap in reflex and nose down trim (on my airplane, small tail, actual TE of elevator is down a bit from neutral) is a very interesting condition to contemplate. After all, the elevator is an upside down wing (slightly cambered on the bottom). Thus, nose down trim is actually with the elevator in reflex. Since the chord of the horizontal stab was positioned with a negative incidence to the longeron (-.5 to -1 degrees, mine is -.8) and at cruise (about 180 - 190 KIAS), the longeron has been measured to be at 0 degrees (hmmm, just like the plane was designed), the horizontal may be at a positive AOA (relative air flow?, think upside down) until one considers the position of the elevator and its trim change on the AOA to a lesser AOA. Thus, less lift (anti lift), less drag. Egads, now my head hurts. Blue Skies, Scott Krueger In a message dated 4/17/2012 8:53:25 A.M. Central Daylight Time, chris_zavatson@yahoo.com writes: I use the attached charts to describe the impact of reflex: Repositioning the drag bucket, a drop of a few drag counts and a huge 3 to 1 change in pitching moment. Chris Zavatson N91CZ 360std _www.N91CZ.net_ (http://www.n91cz.net/) -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html --part1_43a80.7114f03e.3cbed8a0_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable
Chris,
 
Ahh, too bad I can't translate Reynolds numbers into KIAS.  I tho= ught=20 the NASA airfoil tests were at slow speeds????
 
Oh well .. It does match my experience.  At high speeds, flap in= =20 reflex and nose down trim (on my airplane, small tail, actual TE of elevato= r is=20 down a bit from neutral) is a very interesting condition to=20 contemplate.  After all, the elevator is an upside down wing (slightly= =20 cambered on the bottom).  Thus, nose down trim is actually with=20 the elevator in reflex.  Since the chord of the horizontal stab w= as=20 positioned with a negative incidence to the longeron (-.5 to -1 degree= s,=20 mine is -.8) and at cruise (about 180 - 190 KIAS), the longeron h= as=20 been measured to be at 0 degrees (hmmm, just like the plane=20 was designed), the horizontal may be at a positive AOA (relative = air=20 flow?, think upside down) until one considers the position of the elevator = and=20 its trim change on the AOA to a lesser AOA.  Thus, less lift (ant= i=20 lift), less drag.
 
Egads, now my head hurts.
 
Blue Skies,
 
Scott Krueger 
 
In a message dated 4/17/2012 8:53:25 A.M. Central Daylight Time,=20 chris_zavatson@yahoo.com writes:
=
I use the attached charts to describe the impact of reflex:  Repositioning the drag buc= ket, a=20 drop of a few drag counts and a huge 3 to 1 change in pitching moment.
 
Chris Zavatson
N91CZ
360std


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