X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Tue, 04 Aug 2009 18:42:05 -0400 Message-ID: X-Original-Return-Path: Received: from mail.glasair.org ([65.75.24.102] verified) by logan.com (CommuniGate Pro SMTP 5.2.15) with ESMTPS id 3794903 for lml@lancaironline.net; Tue, 04 Aug 2009 16:53:37 -0400 Received-SPF: none receiver=logan.com; client-ip=65.75.24.102; envelope-from=Bruce@Glasair.org Received: from gray1 by mail.glasair.org (VisNetic.MailServer.v9.1.4.1) with ESMTP id LCF90601 for ; Tue, 04 Aug 2009 16:53:01 -0400 From: "Bruce Gray" X-Original-To: "'Lancair Mailing List'" Subject: RE: [LML] Re: Ice with OAT 36*F (LIVP): Ram Recovery on OAT X-Original-Date: Tue, 4 Aug 2009 16:53:00 -0400 X-Original-Message-ID: <45C0342D3E12436A91D259C784DB50BA@gray1> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0768_01CA1524.065F3830" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.2627 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0768_01CA1524.065F3830 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Wouldn't it just be easier to mount t he OAT probe in a wheel well or other sheltered location? Bruce www.Glasair.org -----Original Message----- From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of marv@lancair.net Sent: Tuesday, August 04, 2009 4:27 PM To: lml@lancaironline.net Subject: [LML] Re: Ice with OAT 36*F (LIVP): Ram Recovery on OAT Posted for "Bill" : Ice with OAT 36*F (LIVP): Ram Recovery on OATHey Fred, Airliners have an OAT probe called a "Rosemont probe". The idea is to give a more accurate OAT reading. It's an enclosure around the probe with a bunch of little holes in it. Since only a percentage of the air gets through the holes, the local velocity inside the "cage" is much less. I guess that the theory is that the cage absorbs most of the ram and friction rise leaving the air inside the cage at a low relative velocity and at a temp somewhere near true OAT. There might be much more to this device that I don't know about (I never really gave them much thought other than to make sure that it was "there") but if this is all it is, do you think that we could construct something like this to reduce OAT error? I'd be interested in your thoughts on this. Bill Harrelson N5ZQ 320 1,650 hrs N6ZQ IV under construction [Discussion about this very thing long ago led many folks to install their OAT probes in the gear wells.... the gear doors aren't air-tight and the environment inside the gear well is the same as outside (except for rain & stuff) for all intents and purposes. Just another data point. ] -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html ------=_NextPart_000_0768_01CA1524.065F3830 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

= Wouldn’t it just be easier to mount t he OAT probe in a wheel well or other = sheltered location?

=

Bruce
www.Glasair.org

-----Original = Message-----
From: Lancair Mailing = List [mailto:lml@lancaironline.net] On = Behalf Of marv@lancair.net
Sent: Tuesday, August 04, = 2009 4:27 PM
To: = lml@lancaironline.net
Subject: [LML] Re: Ice = with OAT 36*F (LIVP): Ram Recovery on OAT

Posted for "Bill" = <n5zq@verizon.net>:

Ice with OAT 36*F (LIVP): Ram Recovery on OATHey Fred,

Airliners have an OAT probe called a "Rosemont probe". = The idea is to give a
more accurate OAT reading. It's an enclosure around the probe with a = bunch of
little holes in it. Since only a percentage of the air gets through the = holes,
the local velocity inside the "cage" is much less. I guess = that the theory is
that the cage absorbs most of the ram and friction rise leaving the air = inside
the cage at a low relative velocity and at a temp somewhere near true = OAT.
There might be much more to this device that I don't know about (I never =
really gave them much thought other than to make sure that it was "there") but
if this is all it is, do you think that we could construct something = like this
to reduce OAT error? I'd be interested in your thoughts on this.

Bill Harrelson
N5ZQ 320 1,650 hrs
N6ZQ IV under construction

[Discussion about this very thing long ago led many folks to install = their OAT probes in the gear wells.... the gear doors aren't air-tight and the environment inside the gear well is the same as outside (except for rain = & stuff) for all intents and purposes. Just another data = point. <M> ]

--

For archives and unsub =
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