X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 07 Feb 2014 15:08:27 -0500 Message-ID: X-Original-Return-Path: Received: from mta41.charter.net ([216.33.127.83] verified) by logan.com (CommuniGate Pro SMTP 6.0.8) with ESMTP id 6723043 for lml@lancaironline.net; Fri, 07 Feb 2014 14:36:44 -0500 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.83; envelope-from=troneill@charter.net Received: from imp10 ([10.20.200.15]) by mta41.charter.net (InterMail vM.8.01.05.02 201-2260-151-103-20110920) with ESMTP id <20140207193609.BNCU21087.mta41.charter.net@imp10> for ; Fri, 7 Feb 2014 14:36:09 -0500 Received: from [192.168.169.2] ([75.132.138.21]) by imp10 with smtp.charter.net id PXc91n00A0Tt8ir05Xc98c; Fri, 07 Feb 2014 14:36:09 -0500 X-Authority-Analysis: v=2.0 cv=Q7eKePKa c=1 sm=1 a=aYyw0vc49R1sEpoH71fRzw==:17 a=yUnIBFQkZM0A:10 a=hOpmn2quAAAA:8 a=5NPRkZDOP88A:10 a=5Up8faWwAAAA:8 a=3oc9M9_CAAAA:8 a=Ia-xEzejAAAA:8 a=CjxXgO3LAAAA:8 a=xwdOKBTsVTFkzOaOV7oA:9 a=CjuIK1q_8ugA:10 a=CVU0O5Kb7MsA:10 a=v6MMM96S_sUA:10 a=U8Ie8EnqySEA:10 a=EzXvWhQp4_cA:10 a=rC2wZJ5BpNYA:10 a=QEXdDO2ut3YA:10 a=_W_S_7VecoQA:10 a=DOcyLUcW1lxPTtlR:21 a=aYyw0vc49R1sEpoH71fRzw==:117 X-Auth-id: dHJvbmVpbGxAY2hhcnRlci5uZXQ= Subject: Re: [LML] Re: Angle of attack References: From: Troneill Content-Type: multipart/alternative; boundary=Apple-Mail-6DEDEAAF-2D4D-4E87-9FF9-C2B9C92F5467 X-Mailer: iPad Mail (10B329) In-Reply-To: X-Original-Message-Id: X-Original-Date: Fri, 7 Feb 2014 13:36:10 -0600 X-Original-To: Lancair Mailing List Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-6DEDEAAF-2D4D-4E87-9FF9-C2B9C92F5467 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: quoted-printable Doug, A 'zero degree angle of attack' is established by each airfoil's lift, drag a= nd moment data. Some airfoils generate lift at zero degrees. usually those w= ith camber. also some wings have more than one airfoil. The whole airplane surface generates lift and drag which also varies with A= OA and yaw ... And also varies but little when we use the tail to balance fo= r different CGs... And a little for deployed flaps and gear. Usually not muc= h. And does not vary with weight, airspeed, Gs, etc. I mark my AOA vane at it's stall angle,and when makings turns onto final avo= id coming within five degrees. A best-L/D mark is useful for climb regardless of weight, etc. FWIW. Terrence N211AL 235/320 Waco AristoCraft O'Neill W O'Neill Magnum & V8 Pickup Mitchell Wing/O'2 EZ Riser Dragonfly Qual in Porterfield, Cub, Ercoupe, Aeronca, SM Cessnas SNJ 3,4,5,6c, SNB, P2V5&5F,=20 Sent from my iPad On Feb 7, 2014, at 10:47 AM, Douglas Brunner w= rote: > Question for all the aerodynamicists out there. >=20 > If a plane is flying, its wing must be generating lift. Does a wing gener= ate lift at a zero degree angle of attack? >=20 > I thought that there must be some positive angle of attack in level flight= . Am I wrong about this? >=20 > And if I am right, shouldn't the angle of attack be set to some small posi= tive number? > -----Original Message-----=20 > From: Sky2high@aol.com=20 > Sent: Feb 7, 2014 9:46 AM=20 > To: lml@lancaironline.net=20 > Subject: [LML] Re: Angle of attack=20 >=20 > Tom, > =20 > Interesting. The wing has wash out so different parts of the wing are at s= lightly different AOAs (think propagation of stall). The design has the lon= geron at zero degrees at cruise, flaps at reflex (think chord line from lead= ing edge to flap TE). Even average angle of incidence doesn't work because o= f wing/flap design. Why not use zero, 1 or 2? > =20 > Scott krueger > =20 > In a message dated 2/7/2014 8:16:45 A.M. Central Standard Time, n20087@yah= oo.com writes: > > Folks=20 >=20 > I am about to setup a g3x in my 360. I was wondering if anybody could tel= l me what the typical cruise angle of attack might be >=20 > Thanks >=20 > Tom > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l > -- > For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.htm= l --Apple-Mail-6DEDEAAF-2D4D-4E87-9FF9-C2B9C92F5467 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Doug,
A 'zero degr= ee angle of attack' is established by each airfoil's lift, drag and moment d= ata. Some airfoils generate lift at zero degrees. usually those with camber.=  also some wings have more than one airfoil.
The whole airplane surface  generates l= ift and drag which also = ;varies with A= OA and yaw ... And also varies but little when we use the tail to balance fo= r different CGs... And a little for deployed flaps and gear. Usually not muc= h. And does not vary with weight, airspeed, Gs, etc.
I mark my AOA vane at it's stall angle,an= d when makings turns onto final avoid coming within five degrees.
A best-L/D mark is useful for clim= b regardless of weight, etc.
FWIW.

<= div style=3D"-webkit-text-size-adjust: auto; ">Terrence
N211AL 235/320
Waco AristoCraft
O'Neill W
O'Neill Magnum & V8 Pickup
Mitchell Wing/O'2
EZ Riser
Drago= nfly

Qual in Porterfield, Cub, Ercoupe, A= eronca, SM Cessnas
SNJ 3= ,4,5,6c, SNB, P2V5&5F, 


Sent= from my iPad

On Fe= b 7, 2014, at 10:47 AM, Douglas Brunner <douglasbrunner@earthlink.net> wrote:

body{font-size:10pt;font-family:arial,sans-serif;background-color:#ffffff;= color:black;}p{margin:0px;}= Question for all the aerodynamicists out the= re.

If a plane is flyi= ng, its wing must be generating lift.  Does a wing generate lift at a z= ero degree angle of attack?

I thought that there must be some positive angle of attack in l= evel flight.  Am I wrong about this?

And if I am right, shouldn't the angle of attack b= e set to some small positive number?
-= ----Original Message-----
From: Sky2high@aol.com
Sent: Feb 7, 2014 9:46 AM
To: lml@lancaironline.net
Subject: [LML] Re: Angle of attack

Tom,
 
Interesting.  The wing has wash out so different parts of the wing= are=20 at slightly different AOAs (think propagation of stall).  The design ha= s=20 the longeron at zero degrees at cruise, flaps at reflex (think chord line fr= om=20 leading edge to flap TE).  Even average angle of incidence doesn't work= =20 because of wing/flap design.  Why not use zero, 1 or 2?
 
Scott krueger
 
In a message dated 2/7/2014 8:16:45 A.M. Central Standard Time,=20 n20087@yahoo.com writes:
>=20 Folks

I am about to setup a g3x in my 360.  I was wondering i= f=20 anybody could tell me what the typical cruise angle of attack might=20 be

Thanks

Tom
--
For archives and unsub=20 http://ma= il.lancaironline.net:81/lists/lml/List.html

--
For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html
= --Apple-Mail-6DEDEAAF-2D4D-4E87-9FF9-C2B9C92F5467--