Return-Path: Received: from fed1mtao03.cox.net ([68.6.19.242] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2923361 for flyrotary@lancaironline.net; Thu, 08 Jan 2004 13:30:31 -0500 Received: from BigAl ([68.107.116.221]) by fed1mtao03.cox.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040108182726.KNUA28419.fed1mtao03.cox.net@BigAl> for ; Thu, 8 Jan 2004 13:27:26 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Cooling Date: Thu, 8 Jan 2004 10:28:00 -0800 Message-ID: <001601c3d615$2575f2d0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0017_01C3D5D2.1752B2D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 Importance: Normal X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_0017_01C3D5D2.1752B2D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Another newbie question. After reading Paul Lamar's cooling text: http://home.earthlink.net/~rotaryeng/how-to-cool12.txt I was left wondering if water coolant could be replaced by a liquid with a higher boiling point (such as oil). That combined with running the coolant at a constant higher temp might lead to an increase in cooling efficiency since the difference between the external air and the coolant could be increased. Is there a danger letting the temps of the rotor housings operate at a higher temp as long as we are below the melting point by a safe margin(say 350 vs the water cooled 200-250)? Ignorance is bliss! :-) Mike; The big issues are that the specific heat (heat carrying capacity) of oil is about half that of water; so you would need very high flow rate, which is a double problem since the viscosity is much higher, the pumping power required is very large. Al ------=_NextPart_000_0017_01C3D5D2.1752B2D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Another newbie question.

After reading Paul Lamar's cooling text:

http://home.earthlink.net/~rotaryeng/how-to-co= ol12.txt I was left

wondering if water coolant could be replaced by a liquid with a higher =

boiling point (such as oil).  That combined with running the coolant at =

a constant higher temp might lead to an increase in cooling efficiency =

since the difference between the external air and the coolant could be =

increased.  Is there a danger letting the temps of the rotor housings =

operate at a higher temp as long as we are below the melting point by a =

safe margin(say 350 vs the water cooled 200-250)?

Ignorance is bliss!  :-)

 

Mike;

 <= /font>

The big = issues are that the specific heat (heat carrying capacity) of oil is about half = that of water; so you would need very high flow rate, which is a double problem = since the viscosity is much higher, the pumping power required is very large.

 <= /font>

Al

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