X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fmailhost05.isp.att.net ([204.127.217.105] verified) by logan.com (CommuniGate Pro SMTP 5.3c4) with ESMTP id 4030930 for flyrotary@lancaironline.net; Sat, 19 Dec 2009 12:53:44 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.217.105; envelope-from=bbradburry@bellsouth.net Received: from desktop (adsl-230-67-216.mco.bellsouth.net[74.230.67.216]) by isp.att.net (frfwmhc05) with SMTP id <20091219175308H0500q48soe>; Sat, 19 Dec 2009 17:53:08 +0000 X-Originating-IP: [74.230.67.216] From: "Bill Bradburry" To: "'Rotary motors in aircraft'" References: In-Reply-To: Subject: RE: [FlyRotary] Re: Radiator/Oil Cooler Combo Date: Sat, 19 Dec 2009 12:53:08 -0500 Message-ID: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000A_01CA80AA.37270460" X-Mailer: Microsoft Office Outlook 11 Thread-Index: AcqAyI68PaM9lVa1Qg6TEvix3yXUYgACkZMw X-MimeOLE: Produced By Microsoft MimeOLE V6.0.6001.18049 This is a multi-part message in MIME format. ------=_NextPart_000_000A_01CA80AA.37270460 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Thomas, A coolant thermostat makes it easier to control the temperature of the coolant, but does nothing to help the cooling drag. Trying to control the cooling drag with a cowl flap makes it difficult to control the coolant temperature but has a high payback in fuel costs on a plane. Both of the methods assume that your system is capable of overcooling. Not so easy to accomplish with a rotary! Damned if you do, damned if you don't! Good luck! Bill B _____ From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Thomas Mann Sent: Saturday, December 19, 2009 11:30 AM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Radiator/Oil Cooler Combo Mark, I'm going to investigate that further but first look seems like a winner if it can handle the BTU loads (which does not seem like an issue. I like the idea of a single scoop as well as a single radiator if it can be done. I'm thinking airflow here. The P-51 scoop is supposed to create enough thrust as a result of the heated expanding air jetting out the back to cancel out 90%+ of the drag created. I never could get my head around the whole ram-jet theory but that's the basis. The other benefit I see here is the comment provided earlier about the optimum oil and coolant temp being closer to the 180F range, both of which I could control with my coolant thermostat. Like I say, I have time to work these things out. T Mann Have you considered using a Laminova type oil/water exchanger? They're relatively light, compact, work well, and come in a variety of sizes. Mark S. On Fri, Dec 18, 2009 at 9:13 PM, Thomas Mann wrote: ------=_NextPart_000_000A_01CA80AA.37270460 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Thomas,

A coolant thermostat makes it easier to control the temperature = of the coolant, but does nothing to help the cooling drag.  Trying to = control the cooling drag with a cowl flap makes it difficult to control the coolant temperature but has a high payback in fuel costs on a = plane.

Both of the methods assume that your system is capable of = overcooling.  Not so easy to accomplish with a rotary!

Damned if you do, damned if you = don’t!

Good luck!

 

Bill B 

 

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Thomas Mann
Sent: Saturday, December = 19, 2009 11:30 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Radiator/Oil Cooler Combo

Mark, =

I’m = going to investigate that further  but first look seems like a winner if it = can handle the BTU loads (which does not seem like an = issue.

 <= /o:p>

I like the = idea of a single scoop as well as a single radiator if it can be done. I’m = thinking airflow here.

The P-51 = scoop is supposed to create enough thrust as a result of the heated expanding air jetting out the back to cancel out 90%+ of the drag created. I never = could get my head around the whole ram-jet theory but that’s the = basis.

 <= /o:p>

The other = benefit I see here is the comment provided earlier about the optimum oil and = coolant temp being closer to the 180F range, both of which I could control with my = coolant thermostat.

 <= /o:p>

Like I say, = I have time to work these things out.

 <= /o:p>

T = Mann

 <= /o:p>

 

 

Have you considered using a Laminova type oil/water exchanger?  They're relatively light, compact, work well, and come = in a variety of sizes. 

 

Mark = S.

On Fri, Dec 18, 2009 at 9:13 PM, Thomas Mann <tmann@n200lz.com> = wrote:

 

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