X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [65.54.250.79] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 891174 for flyrotary@lancaironline.net; Wed, 21 Dec 2005 10:36:27 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.250.79; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 21 Dec 2005 07:33:57 -0800 Message-ID: Received: from 4.171.150.29 by BAY115-DAV7.phx.gbl with DAV; Wed, 21 Dec 2005 15:33:57 +0000 X-Originating-IP: [4.171.150.29] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Tracy, Ed, delta T Date: Wed, 21 Dec 2005 10:33:53 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00AF_01C6061A.0A5C3810" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Wed, 21 Dec 2005 10:33:53 -0500 X-OriginalArrivalTime: 21 Dec 2005 15:33:57.0598 (UTC) FILETIME=[F560DFE0:01C60643] This is a multi-part message in MIME format. ------=_NextPart_000_00AF_01C6061A.0A5C3810 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Good question Monty but I don't know. Only looked at it down low on hot = days. I'l try the following experiment next time I fly: Set fuel burn at a constant value (for roughly the same BTU rejection in = both cases). Measure delta T at 1000 ft then at 8000 ft. Airspeed = should also be similar. Do you think IAS or TAS should be the target? Tracy=20 ----- Original Message -----=20 From: Monty Roberts=20 To: Rotary motors in aircraft=20 Sent: Tuesday, December 20, 2005 8:36 PM Subject: [FlyRotary] Tracy, Ed, delta T Tracy and Ed, I was looking at an earlier post where Tracy listed air delta T across = his evap cores in cruise as 70-80F. How much increase in DeltaT do you = see with altitude? I would assume it would increase since the air is = both colder, and thinner. A 10 deg deltaT change makes a substantial = difference when sizing an intake. Monty ------=_NextPart_000_00AF_01C6061A.0A5C3810 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Good question Monty but I don't know.  Only looked at it down = low on=20 hot days.  I'l try the following experiment next time I fly:
 
Set fuel burn at a constant value (for roughly the same BTU = rejection in=20 both cases).  Measure delta T at 1000 ft then at 8000 ft.  = Airspeed=20 should also be similar.  Do you think IAS or TAS should be the=20 target?
 
Tracy
----- Original Message -----
From: Monty=20 Roberts
To: Rotary motors in = aircraft
Sent: Tuesday, December 20, = 2005 8:36=20 PM
Subject: [FlyRotary] Tracy, Ed, = delta=20 T

Tracy and Ed,
 
I was looking at an earlier post = where Tracy=20 listed air delta T across his evap cores in cruise as 70-80F. How much = increase in DeltaT do you see with altitude? I would assume it would = increase=20 since the air is both colder, and thinner. A 10 deg deltaT change = makes a=20 substantial difference when sizing an intake.
 
Monty
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