X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Fri, 27 Aug 2010 16:05:50 -0400 Message-ID: X-Original-Return-Path: Received: from imr-mb02.mx.aol.com ([64.12.207.163] verified) by logan.com (CommuniGate Pro SMTP 5.3.8) with ESMTP id 4445392 for lml@lancaironline.net; Fri, 27 Aug 2010 00:06:33 -0400 Received-SPF: pass receiver=logan.com; client-ip=64.12.207.163; envelope-from=Sky2high@aol.com Received: from imo-da01.mx.aol.com (imo-da01.mx.aol.com [205.188.169.199]) by imr-mb02.mx.aol.com (8.14.1/8.14.1) with ESMTP id o7R45o50008408 for ; Fri, 27 Aug 2010 00:05:50 -0400 Received: from Sky2high@aol.com by imo-da01.mx.aol.com (mail_out_v42.9.) id q.ea4.fd85be (55716) for ; Fri, 27 Aug 2010 00:05:47 -0400 (EDT) Received: from magic-d20.mail.aol.com (magic-d20.mail.aol.com [172.19.155.136]) by cia-md01.mx.aol.com (v129.4) with ESMTP id MAILCIAMD017-d9a44c77399b1e8; Fri, 27 Aug 2010 00:05:47 -0400 From: Sky2high@aol.com X-Original-Message-ID: <16ce30.7dfbb14a.39a8939b@aol.com> X-Original-Date: Fri, 27 Aug 2010 00:05:47 EDT Subject: Re: [LML] Pitot System and AOA X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="part1_16ce30.7dfbb14a.39a8939b_boundary" X-Mailer: AOL 9.5 sub 155 X-AOL-IP: 24.15.17.119 X-Spam-Flag:NO X-AOL-SENDER: Sky2high@aol.com --part1_16ce30.7dfbb14a.39a8939b_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit John, If you are going to be more comfortable with a backup pitot tube, why not just plumb it to a second airspeed indicator? Will you have pitot heat on both? The AOA system I use relies on 4 inputs - upper and lower wing pressures, pitot and static. If I wanted an airspeed backup I would install another heated pitot and a dedicated line to a separate AI in order to keep it simple. Otherwise, I am just going to rely on known power settings cross checked with GPS ground speed and how quickly the clouds or trees are going by. Scott Krueger In a message dated 8/26/2010 8:06:05 P.M. Central Daylight Time, JPKleber@aol.com writes: Greetings, I will have an AOA in my Legacy. That said, I am concerned that if for some reason my pitot tube gets blocked by something like an insect, bird, or other debris, my airspeed indicator will probably be giving me an erroneous reading. Would not this error also be reflected in the AOA? Therefore, would it not be a good idea to have the AOA on its own pitot source? And could one tie both pitot tube together so that if one was blocked, the other would continue to provide pitot pressure? Thank you in advance for your input. John Kleber --part1_16ce30.7dfbb14a.39a8939b_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

John,

If you are going to be more comfortable with a backup pitot tube, why= not=20 just plumb it to a second airspeed indicator? Will you have pitot he= at on=20 both?

The AOA system I use relies on 4 inputs - upper and lower wing pressu= res,=20 pitot and static. If I wanted an airspeed backup I would install ano= ther=20 heated pitot and a dedicated line to a separate AI in order to keep= it=20 simple. Otherwise, I am just going to rely on known power settings= cross=20 checked with GPS ground speed and how quickly the clouds or trees are goin= g=20 by.

Scott Krueger

In a message dated 8/26/2010 8:06:05 P.M. Central Daylight Time,=20 JPKleber@aol.com writes:

Greetings,

I will have an AOA in my Legacy.

That said, I am concerned that if for some reason my pitot= tube=20 gets blocked by something like an insect, bird, or other debris, my airs= peed=20 indicator will probably be giving me an erroneous reading. =20

Would not this error also be reflected in the AOA?=

Therefore, would it not be a good idea to have the AOA on= its own=20 pitot source? And could one tie both pitot tube together so that= if one=20 was blocked, the other would continue to provide pitot=20 pressure?

Thank you in advance for your input.

John Kleber

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