Return-Path: Received: from [24.25.9.101] (HELO ms-smtp-02-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.1.5) with ESMTP id 2645793 for flyrotary@lancaironline.net; Tue, 21 Oct 2003 17:41:11 -0400 Received: from o7y6b5 (clt78-020.carolina.rr.com [24.93.78.20]) by ms-smtp-02-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id h9LLf3R9013222 for ; Tue, 21 Oct 2003 17:41:05 -0400 (EDT) Message-ID: <000a01c3981b$ce8b9920$1702a8c0@WorkGroup> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Bill Eslick Radiator coolant delta T Date: Tue, 21 Oct 2003 17:39:28 -0400 MIME-Version: 1.0 Content-Type: multipart/related; boundary="----=_NextPart_000_0006_01C397FA.47260CC0"; type="multipart/alternative" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0006_01C397FA.47260CC0 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0007_01C397FA.47260CC0" ------=_NextPart_001_0007_01C397FA.47260CC0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable ----- Original Message -----=20 From: Bill Eslick=20 To: Rotary motors in aircraft=20 Sent: Tuesday, October 21, 2003 1:18 PM Subject: [FlyRotary] Re: Radiator coolant delta T I promised to report my indicated water temps next chance I got. = Here are some samples: OAT(F) Delta T (F) 69 23 66 19 68 10 75 14 =20 65 15 75 7 77 12 All figures are in cruise at 8,000 to 10,000 MSL. Last reading = was in climbout, but not much difference. I really can't explain the = range of readings, but that is what it read! =20 Thanks for the data, Bill I ran it through my model, but did not have your power or fuel = burn or airspeed. But assuming you were doing approx 140 Indictated air = speed at altitude and modest power (5200 rpm) my figures shows a delta T = of 12.27F. If you were running a bit harder the delta T would go up a = bit. If you were moving faster than 140 indicated at 5200 rpm then it = would go down a bit. For climb I assumed 120 Indicated and a minimum of 130HP this = gave me a delta T of 24F for the radiators. Both figures not too far = off from what you are reporting. So the delta T would seem to be dependent on your power setting = and air speed most of all. The more BTUs of heat you reject into the = same amount of mass flow, the greater the delta T. However, the faster = you go the more cooling mass flow you get which appears to help to hold = down the delta T. =20 In any case, appreciate the data Ed Anderson =20 =20 =20 ____________________________________________________ IncrediMail - Email has finally evolved - Click Here ------=_NextPart_001_0007_01C397FA.47260CC0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
----- = Original Message=20 -----
From:=20 Bill = Eslick=20
Sent: Tuesday, October 21, 2003 = 1:18=20 PM
Subject: [FlyRotary] Re: = Radiator coolant=20 delta T

I promised to report my indicated water temps next chance I = got.=20 Here are some samples:
 
OAT(F)        Delta T = (F)
69           =20         23
66           =20         19
68           =20         10
75           =20         14    =
65           =20         15
75           =20         7
77           =20         12
 
All figures are in cruise at 8,000 to 10,000 MSL.  = Last=20 reading was in climbout, but not much difference.  I really = can't=20 explain the range of readings, but that is what it read!
 
 
Thanks for the data, Bill
 
  I ran it through my model, but did=20 not have your power or fuel burn or airspeed.  But = assuming=20 you were doing approx 140 Indictated air speed at altitude and = modest=20 power (5200 rpm) my figures shows a delta T of 12.27F.  If = you were=20 running a bit harder the delta T would go up a bit.  If you = were=20 moving faster than 140 indicated at 5200 rpm then it would go = down a=20 bit.
 
For climb I assumed 120 Indicated and a = minimum of=20 130HP this gave me a delta T of 24F for the radiators.  = Both=20 figures not too far off from what you are = reporting.
 
So the delta T would seem to be dependent on = your=20 power setting and air speed most of all.  The more BTUs of = heat you=20 reject into the same amount of mass flow, the greater the = delta T.=20 However, the faster you go the more cooling mass flow you get = which=20 appears to help to hold down the delta T. 
 
In any case, appreciate the = data
 
Ed Anderson
 
____________________________________________________
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