X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 30 Mar 2014 15:34:51 -0400 Message-ID: X-Original-Return-Path: Received: from elasmtp-spurfowl.atl.sa.earthlink.net ([209.86.89.66] verified) by logan.com (CommuniGate Pro SMTP 6.0.9e) with ESMTP id 6806567 for lml@lancaironline.net; Sun, 30 Mar 2014 14:44:04 -0400 Received-SPF: none receiver=logan.com; client-ip=209.86.89.66; envelope-from=douglasbrunner@earthlink.net DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=earthlink.net; b=oyf+JGwjB/mhNtnV8x3cUB/oEHFMAMfsyAR9YQNItVlCd8Avda3B9GJZ2RjQuTYW; h=Received:From:To:References:In-Reply-To:Subject:Date:Message-ID:MIME-Version:Content-Type:X-Mailer:Thread-Index:Content-Language:X-ELNK-Trace:X-Originating-IP; Received: from [67.8.30.30] (helo=DougsVAIO) by elasmtp-spurfowl.atl.sa.earthlink.net with esmtpa (Exim 4.67) (envelope-from ) id 1WUKhd-0007NH-4F for lml@lancaironline.net; Sun, 30 Mar 2014 14:43:29 -0400 From: "Douglas Brunner" X-Original-To: "'Lancair Mailing List'" References: In-Reply-To: Subject: RE: [LML] Re: FW: Adding an AOA X-Original-Date: Sun, 30 Mar 2014 14:43:28 -0400 X-Original-Message-ID: <002401cf4c47$f156f2b0$d404d810$@net> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0025_01CF4C26.6A4552B0" X-Mailer: Microsoft Office Outlook 12.0 Thread-Index: Ac9MRJDtiyWFdhcTQGm7b2dKPBQT7AAAt0Ng Content-Language: en-us X-ELNK-Trace: ad85a799c4f5de37c2eb1477c196d22294f5150ab1c16ac0b4de374c5ae8ff79005a1e568c1e955e20ee46098bad4fbb350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 67.8.30.30 This is a multi-part message in MIME format. ------=_NextPart_000_0025_01CF4C26.6A4552B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Terrence, There is no "angle" to mark. Both instruments use an array of colored lights - in both, the top colored light is a red arrow pointing down - 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@lancaironline.net Subject: [LML] Re: FW: Adding an AOA D., IMHO the prime purpose of an AOA is: 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. Terrence L235/320 N211AL On Mar 30, 2014, at 9:23 AM, Douglas Brunner wrote: 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/KL R-10) and one of the Alpha Systems units (http://www.alphasystemsaoa.com/) 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 "on ground" and "cruise" are self explanatory, however the definition of "Optimum Alpha Angle" seems a little "loosey-goosey" to me. Here are the definitions: Alpha Systems "Optimum Alpha Angle" . Able to hold altitude - as close to 0 VSI as possible, zero sink . Full aileron, elevator and rudder control - no buffet or loss of control surface stability Bendix King "Optimum Alpha Angle" . Able to hold altitude, 0 Vertical Speed, zero sink (5 to 10 fpm climb OK) . 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. 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 "Optimum Alpha Angle" in landing configuration (gear down, full flaps). However, determining when I have "full aileron, elevator and rudder control" isn't all that clear to me. I am sure that I can tell when I have aileron, elevator and rudder control - but the "full" 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 "Optimum Alpha Angle" to 1.3 x stall. Advice? D. Brunner N241DB 750 hours ------=_NextPart_000_0025_01CF4C26.6A4552B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Terrence,

 

There is no “angle” to mark.  Both instruments use = an array of colored lights -  in both, the top colored light is a = red arrow pointing down – 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@lancaironline.net
Subject: [LML] Re: FW: = Adding an AOA

 

D.,

 

IMHO the prime purpose of an AOA is:

 

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.

 

Terrence

L235/320

N211AL

 

On = Mar 30, 2014, at 9:23 AM, Douglas Brunner wrote:



 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-Indica= tors/Indicators/KLR-10) and one of the Alpha Systems units (http://www.alphasystemsaoa.com/<= /a>)

My question has to do with = the calibration.  Both systems require a calibration at 3 = points:=

 =

D. Brunner=

N241DB 750 = hours=

 

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