X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao101.cox.net ([68.230.241.45] verified) by logan.com (CommuniGate Pro SMTP 5.3.1) with ESMTP id 4080874 for flyrotary@lancaironline.net; Wed, 13 Jan 2010 00:56:20 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.45; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao101.cox.net (InterMail vM.8.00.01.00 201-2244-105-20090324) with ESMTP id <20100113055545.YHOM4995.fed1rmmtao101.cox.net@fed1rmimpo01.cox.net> for ; Wed, 13 Jan 2010 00:55:45 -0500 Received: from BigAl ([72.192.128.205]) by fed1rmimpo01.cox.net with bizsmtp id Utvk1d00C4S1t5C03tvkCU; Wed, 13 Jan 2010 00:55:45 -0500 X-VR-Score: 0.00 X-Authority-Analysis: v=1.1 cv=4cmh2gL1a6RJOvq2diO5/mV5P7W7DelkioqUudxRLMU= c=1 sm=1 a=Vegc0WxVmH5BHtpNDyThtA==:17 a=VySFMktc52UnFVCWFvgA:9 a=ntUadS8S4fjPOfDhwys40BAxWocA:4 a=EnwOGek2hfi7smZJpj4A:9 a=jTTUp_wUsNKgauTQV6kA:7 a=B0IWRFEZJRqVY7CgNIFYh3yxApMA:4 a=Vegc0WxVmH5BHtpNDyThtA==:117 X-CM-Score: 0.00 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Heater Core Question Date: Tue, 12 Jan 2010 21:57:09 -0800 Message-ID: <6BBB2DCC741D4F98850EAACFC64E259E@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0020_01CA93D2.3083CE00" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6856 In-Reply-To: Thread-Index: AcqT69crKjr4yA28S22JIwv2/8hgUAAJ/GIg Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 This is a multi-part message in MIME format. ------=_NextPart_000_0020_01CA93D2.3083CE00 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable For you guys already flying what are you doing about supplying air to = your heater core; cockpit air or dedicated outside air source? Typically, with a reasonable amount of flow, you'll get 30-50 heat-up of = the air through the heater core. So running outside air through from a = scoop works OK until you REALLY need it - when the outside air is somewhere = below freezing. Because of that I chose to recirculate the cabin air. The = most efficient blowers are centrifugal (squirrel-cage) so they give you the = most blow for the least weight and power. =20 For those flying with recirc. air do you ever have windscreen fogging = like you do in a car on humid days in the recirc. Position Unfortunately (or fortunately) I haven't flown in enough cold weather to find out. =20 Al G ------=_NextPart_000_0020_01CA93D2.3083CE00 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

For you guys already flying what are you doing about = supplying air to your heater core; cockpit air or dedicated outside air = source?

Typically, with a reasonable = amount of flow, you’ll get 30-50 heat-up of the air through the heater = core.  So running outside air through from a scoop works OK until you REALLY = need it – when the outside air is somewhere below freezing.  Because of that = I chose to recirculate the cabin air.  The most efficient blowers are = centrifugal (squirrel-cage) so they give you the most blow for the least weight and = power.

 

For those flying with recirc. air do you ever have windscreen fogging like = you do in a car on humid days in the recirc. Position

Unfortunately (or fortunately) I = haven’t flown in enough cold weather to find out.

 

Al G

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