X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from cdptpa-omtalb.mail.rr.com ([75.180.132.121] verified) by logan.com (CommuniGate Pro SMTP 5.2c1) with ESMTP id 2490174 for flyrotary@lancaironline.net; Thu, 15 Nov 2007 14:54:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=75.180.132.121; envelope-from=eanderson@carolina.rr.com Received: from edward2 ([24.74.103.61]) by cdptpa-omta01.mail.rr.com with SMTP id <20071115195408.BEOP6760.cdptpa-omta01.mail.rr.com@edward2> for ; Thu, 15 Nov 2007 19:54:08 +0000 Message-ID: <000701c827c1$99c8bc60$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Pulsation Fatique was [FlyRotary] Re: Harrison cores Date: Thu, 15 Nov 2007 14:56:23 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0004_01C82797.B09CF340" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.3138 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 This is a multi-part message in MIME format. ------=_NextPart_000_0004_01C82797.B09CF340 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable One thing you may want to check on (Rusty are you still on?) is that = while the Harrison GM cores can take a lot of pressure, the pressure = pulsations by such things as positive displacement oil pump could = possible fatigue the metal. While I know of no conclusive proof of this = happening, there has been more than one failure of a Harrison GM core = being used as an oil cooler. =20 I know that Tracy took special steps to "reinforce" his oil cooler and = also has a oil accumulator to absorb the pulsations from the oil pump. = Would seem like a good idea to me. Apparently the centrifugal pump (such as the water pump) causes far less = (if any pulsation's) but an oil pump is a different horse. Ed ----- Original Message -----=20 From: Schemmel, Grant=20 To: Rotary motors in aircraft=20 Sent: Thursday, November 15, 2007 2:29 PM Subject: [FlyRotary] Re: Harrison cores I did a quick internet search for Harrison specs., and found a = document that mentions Harrison specified them as 400 psi. This is actually kind of fascinating in that it's a report on running = a turbocharged engine on LP and doing intercooling with the Harrison = core as an intercooler. = http://www.osti.gov/bridge/servlets/purl/771212-RPXhkD/native/771212.PDF Grant Schemmel -------------------------------------------------------------------------= --- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Ben Baltrusaitis Sent: Thursday, November 15, 2007 12:06 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Harrison cores Tracy and Lynn, How much pressure are these cores good for? I plan to run dry sump = with at least 60 lbs. Thanks! Ben ----- Original Message -----=20 From: Tracy Crook=20 To: Rotary motors in aircraft=20 Sent: 11/15/2007 1:43 PM Subject: [FlyRotary] Re: Harrison cores I am absolutely amazed at how well the GM evap. core is cooling = the oil on my 20B installation. Cooling well at WOT on the ground! I = would have previously thought this was not possible with a thick heat = exchanger. It does have the best diffuser I've built to date on it and = has prop blast into it.=20 Tracy On Nov 15, 2007 1:33 PM, wrote: The Harrison built (same as Corvette radiator) used in air = conditioning in full sized GM cars are designed to flow a major amount = of air. They are cheap even when bought new. They transfer heat as good = as anything you can find. They are compact. Two of them can dump the = heat from most any rotary installation. Two of them for coolant and one = for oil has been proven in a number of installations.=20 If you want less cooling drag build the radiators into the wing = skins like a Supermarine racer.=20 I raced for years with one Harrison core for oil cooling in = front of the water radiator. A poor installation with heated air going = through the water radiator, but it worked just fine.=20 Lynn E. Hanover Notice: This e-mail is intended solely for use of the individual or = entity to which it is addressed and may contain information that is = proprietary, privileged, company confidential and/or exempt from = disclosure under applicable law. If the reader is not the intended = recipient or agent responsible for delivering the message to the = intended recipient, you are hereby notified that any dissemination, = distribution or copying of this communication is strictly prohibited. If = this communication has been transmitted from a U.S. location it may also = contain data subject to the International Traffic in Arms Regulations or = U.S. Export Administration Regulations and cannot be disseminated, = distributed or copied to foreign nationals, residing in the U.S. or = abroad, without the prior approval of the U.S. Department of State or = appropriate export licensing authority. If you have received this = communication in error, please notify the sender by reply e-mail or = collect telephone call and delete or destroy all copies of this e-mail = message, any physical copies made of this e-mail message and/or any file = attachment(s). ------=_NextPart_000_0004_01C82797.B09CF340 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
One thing you may want to check on (Rusty are = you still=20 on?) is that while the Harrison GM cores can take a lot of pressure, the = pressure pulsations by such things as positive displacement oil pump = could=20 possible fatigue the metal.  While I know of no conclusive proof of = this=20 happening, there has been more than one failure of a Harrison GM core = being used=20 as an oil cooler. 
 
I know that Tracy took special steps to = "reinforce" his=20 oil cooler and also has a oil accumulator to absorb the pulsations =  from=20 the oil pump. Would seem like a good idea to me.
 
Apparently the centrifugal pump (such as the = water pump)=20 causes far less (if any pulsation's) but an oil pump is a different=20 horse.
 
Ed
----- Original Message -----
From:=20 Schemmel, Grant
Sent: Thursday, November 15, = 2007 2:29=20 PM
Subject: [FlyRotary] Re: = Harrison=20 cores

I did a quick internet search for Harrison = specs., and=20 found a document that mentions Harrison specified them as 400=20 psi.
 
This is actually kind of fascinating in that = it's a=20 report on running a turbocharged engine on LP and doing = intercooling=20 with  the Harrison core as an intercooler.
 
http://www.osti.gov/bridge/servlets/purl/771212-RPXhkD/native/77= 1212.PDF
 
Grant Schemmel

From: Rotary motors in aircraft=20 [mailto:flyrotary@lancaironline.net] On Behalf Of Ben=20 Baltrusaitis
Sent: Thursday, November 15, 2007 12:06=20 PM
To: Rotary motors in aircraft
Subject: = [FlyRotary]=20 Re: Harrison cores

Tracy and = Lynn,
How much = pressure are=20 these cores good for? I plan to run dry sump with at least 60=20 lbs.
Thanks!
Ben
----- Original Message ----- =
From:=20 Tracy Crook
To: Rotary motors in = aircraft=20
Sent: 11/15/2007 1:43 = PM
Subject: [FlyRotary] Re: = Harrison=20 cores

 
I am absolutely amazed at how well the GM evap. core is = cooling the=20 oil on my 20B installation.  Cooling well at WOT on the = ground! =20 I would have previously thought this was not possible with a thick = heat=20 exchanger.  It does have the best diffuser I've built to date = on it=20 and has prop blast into it.
 
Tracy

On Nov 15, 2007 1:33 PM, <Lehanover@aol.com> = wrote:
The Harrison built (same as Corvette radiator) used in air=20 conditioning in full sized GM cars are designed to flow a major = amount=20 of air. They are cheap even when bought new. They transfer heat = as good=20 as anything you can find. They are compact. Two of them can dump = the=20 heat from most any rotary installation. Two of them for coolant = and one=20 for oil has been proven in a number of installations.
 
If you want less cooling drag build the radiators into the = wing=20 skins like a Supermarine racer.
 
I raced for years with one Harrison core for oil cooling in = front=20 of the water radiator. A poor installation with heated air going = through=20 the water radiator, but it worked just fine.
 
Lynn E.=20 = Hanover
Notice: This e-mail is intended solely for use of the = individual or=20 entity to which it is addressed and may contain information that is=20 proprietary, privileged, company confidential and/or exempt from = disclosure=20 under applicable law. If the reader is not the intended recipient or = agent=20 responsible for delivering the message to the intended recipient, you = are=20 hereby notified that any dissemination, distribution or copying of = this=20 communication is strictly prohibited. If this communication has been=20 transmitted from a U.S. location it may also contain data subject to = the=20 International Traffic in Arms Regulations or U.S. Export = Administration=20 Regulations and cannot be disseminated, distributed or copied to = foreign=20 nationals, residing in the U.S. or abroad, without the prior approval = of the=20 U.S. Department of State or appropriate export licensing authority. If = you=20 have received this communication in error, please notify the sender by = reply=20 e-mail or collect telephone call and delete or destroy all copies of = this=20 e-mail message, any physical copies made of this e-mail message and/or = any=20 file attachment(s). ------=_NextPart_000_0004_01C82797.B09CF340--