Return-Path: Sender: "Marvin Kaye" To: lml@lancaironline.net Date: Sat, 18 Dec 2004 22:53:41 -0500 Message-ID: X-Original-Return-Path: Received: from imo-d05.mx.aol.com ([205.188.157.37] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 572788 for lml@lancaironline.net; Sat, 18 Dec 2004 22:51:57 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.157.37; envelope-from=Sky2high@aol.com Received: from Sky2high@aol.com by imo-d05.mx.aol.com (mail_out_v37_r3.8.) id q.8e.1cd5623a (3310) for ; Sat, 18 Dec 2004 22:51:21 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: <8e.1cd5623a.2ef654b9@aol.com> X-Original-Date: Sat, 18 Dec 2004 22:51:21 EST Subject: Re: [LML] Lancair flaps (320 Mark II tail) X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1103428281" X-Mailer: 9.0 Security Edition for Windows sub 5000 -------------------------------1103428281 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit In a message dated 12/18/2004 7:22:11 P.M. Central Standard Time, bill_kennedy_3@hotmail.com writes: When we are talking flap reflex position is it relative to the wing chord or the aircraft longitudinal axis? What is the gain from 0 degrees to the proper reflex position? Bill, With respect to 320s and 360s, The faired in position of the flaps is -7 degrees from what would be the design normal wing chord line. This is the cruise configuration and results in the tremendous drag reduction of the wing (if built and finished properly). If one was to look from the wingtip to the fuselage with the flaps in the reflex position (faired in to the fuselage filet), one can see the corner (valley) formed at the intersection of the wing TE and the flap LE. As the flap is moved to the 0 degree position, there is a strong nose down pitching moment and a significant increase in drag such that the same power setting results in a 10-15 Knot reduction in speed. The more the flap is extended, the more pitching moment and drag - although, after about 10 degrees down, the drag seems to increase more than the pitching moment. I did some reporting about a year ago about slow flight, flap position, drag (loss of airspeed) and AOA. I am sure a search of the archives would turn something up. Scott Krueger AKA Grayhawk N92EX IO320 Aurora, IL (KARR) Some Assembly Required Using Common Hand Tools. -------------------------------1103428281 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

In a message dated 12/18/2004 7:22:11 P.M. Central Standard Time,=20 bill_kennedy_3@hotmail.com writes:

<= FONT=20 style=3D"BACKGROUND-COLOR: transparent" face=3DArial color=3D#000000 size= =3D2>When we=20 are talking flap reflex position is it relative to the wing chord or
t= he=20 aircraft longitudinal axis? What is the gain from 0 degrees to the
pro= per=20 reflex position?

Bill,

With respect to 320s and 360s, The faired in position of the flaps is -= 7=20 degrees from what would be the design normal wing chord line. Thi= s is=20 the cruise configuration and results in the tremendous drag reduction of the= =20 wing (if built and finished properly). If one was to look from the win= gtip=20 to the fuselage with the flaps in the reflex position (faired in to the fuse= lage=20 filet), one can see the corner (valley) formed at the intersection of the wi= ng=20 TE and the flap LE.

As the flap is moved to the 0 degree position, there is a strong nose d= own=20 pitching moment and a significant increase in drag such that the same power=20 setting results in a 10-15 Knot reduction in speed. The more the f= lap=20 is extended, the more pitching moment and drag - although, after about 10=20 degrees down, the drag seems to increase more than the pitching moment.

I did some reporting about a year ago about slow flight, flap position,= =20 drag (loss of airspeed) and AOA. I am sure a search of the archives wo= uld=20 turn something up. =20

Scott Krueger=20 AKA Grayhawk
N92EX IO320 Aurora, IL (KARR)

Some Assembly Required=20
Using Common Hand Tools.

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