X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [24.25.9.100] (HELO ms-smtp-01-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 887621 for flyrotary@lancaironline.net; Sun, 18 Dec 2005 19:36:07 -0500 Received-SPF: pass receiver=logan.com; client-ip=24.25.9.100; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-024-074-025-165.carolina.res.rr.com [24.74.25.165]) by ms-smtp-01-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id jBJ0ZKWe025586 for ; Sun, 18 Dec 2005 19:35:21 -0500 (EST) Message-ID: <000b01c60434$20ca09c0$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Heat Exchangers Date: Sun, 18 Dec 2005 19:35:35 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0008_01C6040A.37A54580" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0008_01C6040A.37A54580 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable No question if you optimize for cruise cooling for minimum drag, you = will undoubtedly encounter a cooling deficit at high power/low = airspeeds. But, pulling back on power (and keeping airflow high as = high as practical) should allow it to work. Ed ----- Original Message -----=20 From: John Slade=20 To: Rotary motors in aircraft=20 Sent: Sunday, December 18, 2005 7:16 PM Subject: [FlyRotary] Re: Heat Exchangers However, my calculations also indicate you may have to hit as much as = 150-160 MPH before your cooling is able to keep up with the heat = rejection.=20 Interesting point, Ed. Perhaps the ideal cooling system design looses = ground during the initial take-off and climb phase. You'd take off on = full power with temps low and back off on the throttle if you get to the = max temp limit before reaching enough speed to cool the full load. Once = you're up to speed, then you can cruise with minimum drag.=20 By the way, Monty, what are you building??? Regards, John ------=_NextPart_000_0008_01C6040A.37A54580 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
No question if you optimize for cruise cooling = for minimum=20 drag, you will undoubtedly encounter a cooling deficit at high power/low = airspeeds.   But, pulling back on power (and keeping airflow = high as=20 high as practical) should allow it to work.
 
Ed
----- Original Message -----
From:=20 John=20 Slade
Sent: Sunday, December 18, 2005 = 7:16=20 PM
Subject: [FlyRotary] Re: Heat=20 Exchangers

However, my calculations also indicate you may = have to=20 hit as much as 150-160 MPH before your cooling is able to keep up with = the=20 heat rejection. 
 
Interesting point,=20 Ed. Perhaps the ideal cooling system design looses ground during the = initial=20 take-off and climb phase.  You'd take off on full power with = temps low=20 and back off on the throttle if you get to the max temp limit before = reaching=20 enough speed to cool the full load. Once you're up to speed, then you = can=20 cruise with minimum drag.
 
By = the way, Monty,=20 what are you building???
Regards,
John
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