X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 30 Mar 2014 17:23:28 -0400 Message-ID: X-Original-Return-Path: Received: from mta11.charter.net ([216.33.127.80] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTP id 6806602 for lml@lancaironline.net; Sun, 30 Mar 2014 15:59:47 -0400 Received-SPF: pass receiver=logan.com; client-ip=216.33.127.80; envelope-from=troneill@charter.net Received: from imp10 ([10.20.200.15]) by mta11.charter.net (InterMail vM.8.01.05.09 201-2260-151-124-20120717) with ESMTP id <20140330195914.SICH6169.mta11.charter.net@imp10> for ; Sun, 30 Mar 2014 15:59:14 -0400 Received: from [192.168.2.3] ([75.132.161.69]) by imp10 with smtp.charter.net id jvzE1n00G1W8Pdn05vzEBh; Sun, 30 Mar 2014 15:59:14 -0400 X-Authority-Analysis: v=2.0 cv=Q7eKePKa c=1 sm=1 a=dksOS2KhiOYOTGJMmz5HMQ==:17 a=i-_0iLLR02oA:10 a=yUnIBFQkZM0A:10 a=hOpmn2quAAAA:8 a=Ia-xEzejAAAA:8 a=uPYnuhDeAAAA:8 a=agrPUkRYAAAA:8 a=jywd9YKNwfNsfukNoQkA:9 a=pILNOxqGKmIA:10 a=EzXvWhQp4_cA:10 a=_BTreCVxijjfuct8:21 a=dGeqyFI4husA3_VJ:21 a=SNqefp2jiEvCdyI7P5UA:9 a=_W_S_7VecoQA:10 a=YZypEMFuS6UA:10 a=dksOS2KhiOYOTGJMmz5HMQ==:117 From: Terrence O'Neill Mime-Version: 1.0 (Apple Message framework v1085) Content-Type: multipart/alternative; boundary=Apple-Mail-28--856957283 Subject: Re: [LML] Re: FW: Adding an AOA X-Original-Date: Sun, 30 Mar 2014 14:59:13 -0500 In-Reply-To: X-Original-To: "Lancair Mailing List" References: X-Original-Message-Id: <7F05FABF-1F24-4CB8-9C79-0588D7DCA88C@charter.net> X-Mailer: Apple Mail (2.1085) --Apple-Mail-28--856957283 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=windows-1252 D, There's no "safe speed".=20 Wings stall at an ANGLE. I.e. Angle of attack. I'm just sayin. T On Mar 30, 2014, at 2:34 PM, Douglas Brunner wrote: > Terrence, > =20 > There is no =93angle=94 to mark. Both instruments use an array of = colored lights - in both, the top colored light is a red arrow pointing = down =96 presumably this is to indicate a stall. > =20 > The way that both are made to be used is to define a safe speed = (roughly 1.3 Vso) that can be used during landing (and other maneuvers) > =20 > My question was whether to set it to 1.3 Vso or to do the maneuver = described in the setup. > =20 > D. Brunner > =20 > From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of = Terrence O'Neill > Sent: Sunday, March 30, 2014 2:18 PM > To: lml@lancaironline.net > Subject: [LML] Re: FW: Adding an AOA > =20 > D., > =20 > IMHO the prime purpose of an AOA is: > =20 > To make the wing's STALL ANGLE visible to the pilot. You do that by = flying the plane and stalling it as you watch the AOA... then mark that = angle. > The next most useful AOA info is the best L/D or best R/C... done the = same way... fly the plane while watching the best R/C for a given power = setting, and make that angle. > =20 > Terrence > L235/320 > N211AL > =20 > On Mar 30, 2014, at 9:23 AM, Douglas Brunner wrote: >=20 >=20 > I am thinking of adding an AOA to my plane. The two models that I am = looking at are the Bendix King KLR 10 = (http://www.bendixking.com/Products/Flight-Controls-Indicators/Indicators/= KLR-10) and one of the Alpha Systems units = (http://www.alphasystemsaoa.com/) >=20 > My question has to do with the calibration. Both systems require a = calibration at 3 points: >=20 > 1. On Ground > 2. Optimum Alpha Angle > 3. Cruise > =20 > The =93on ground=94 and =93cruise=94 are self explanatory, however the = definition of =93Optimum Alpha Angle=94 seems a little =93loosey-goosey=94= to me. Here are the definitions: > =20 > Alpha Systems =93Optimum Alpha Angle=94 > =B7 Able to hold altitude =96 as close to 0 VSI as possible, = zero sink > =B7 Full aileron, elevator and rudder control =96 no buffet or = loss of control surface stability > =20 > Bendix King =93Optimum Alpha Angle=94 > =B7 Able to hold altitude, 0 Vertical Speed, zero sink (5 to = 10 fpm climb OK) > =B7 Full aileron, elevator and rudder control, not in a = buffet, pilot to identify the set point by > pitching back slowly to a pitch no longer able to climb but able to = hold altitude with full > control of the airplane. > =20 > First of all, since this is a system meant to be used in landing (or = at least that is how I will mostly use it), I intend to calibrate the = =93Optimum Alpha Angle=94 in landing configuration (gear down, full = flaps). However, determining when I have =93full aileron, elevator and = rudder control=94 isn=92t all that clear to me. I am sure that I can = tell when I have aileron, elevator and rudder control =96 but the =93full=94= part is less clear. Does that mean a full control deflection? Not = something I am anxious to try that close to stall. > =20 > Alternatively, I could just do a stall in landing configuration and = set the =93Optimum Alpha Angle=94 to 1.3 x stall. > =20 > Advice? > =20 >=20 > D. Brunner >=20 > N241DB 750 hours >=20 > =20 --Apple-Mail-28--856957283 Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=windows-1252 D,
There's no "safe = speed". 
Wings stall at an ANGLE. I.e. Angle of = attack.
I'm just = sayin.

T


O= n Mar 30, 2014, at 2:34 PM, Douglas Brunner wrote:

There = is no =93angle=94 to mark.  Both instruments use an array of = colored lights -  in both, the top colored light is a red arrow = pointing down =96 presumably this is to indicate a = stall.
The = way that both are made to be used is to define a safe speed (roughly 1.3 = Vso) that can be used during landing (and other = maneuvers)
My = question was whether to set it to 1.3 Vso or to do the maneuver = described in the setup.
 
D. = Brunner
From: Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of Terrence = O'Neill
Sent: Sunday, March 30, 2014 2:18 = PM
To:  [LML] Re: FW: Adding an = AOA
I am = thinking of adding an AOA to my plane.  The two models that I am = looking at are the Bendix King KLR 10 (My question has to = do with the calibration.  Both systems require a calibration at 3 = points:

1. On Ground
2. Optimum Alpha = Angle
3. Cruise The =93on ground=94 and =93cruise=94 are self = explanatory, however the definition of =93Optimum Alpha Angle=94 seems a = little =93loosey-goosey=94 to me.  Here are the = definitions:
Alpha Systems =93Optimum = Alpha Angle=94
=B7 Able to hold altitude =96 = as close to 0 VSI as possible, zero sink
=B7 Full aileron, elevator and = rudder control =96 no buffet or loss of control surface = stability
 Bendix King =93Optimum Alpha Angle=94
=B7 Able to hold altitude, 0 = Vertical Speed, zero sink (5 to 10 fpm climb OK)
=B7 Full aileron, elevator and = rudder control, not in a buffet, pilot to identify the set point = by
control of the airplane. First of all, since this is a system meant to be = used in landing (or at least that is how I will mostly use it), I intend = to calibrate the =93Optimum Alpha Angle=94 in landing configuration = (gear down, full flaps).  However, determining when I have =93full = aileron, elevator and rudder control=94 isn=92t all that clear to = me.  I am sure that I can tell when I have aileron, elevator and = rudder control =96 but the =93full=94 part is less clear.  Does = that mean a full control deflection?  Not something I am anxious to = try that close to stall. Alternatively, I could just do a stall in = landing configuration and set the =93Optimum Alpha Angle=94 to 1.3 x = stall.
 Advice?

 D. = Brunner

N241DB 750 hours