X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from hub026-NJ-6.exch026.serverdata.net ([206.225.166.169] verified) by logan.com (CommuniGate Pro SMTP 6.0.7) with ESMTPS id 6643746 for flyrotary@lancaironline.net; Wed, 18 Dec 2013 09:31:35 -0500 Received-SPF: none receiver=logan.com; client-ip=206.225.166.169; envelope-from=jwhaley@datacast.com Received: from MBX026-E1-NJ-2.exch026.domain.local ([10.240.14.52]) by HUB026-NJ-6.exch026.domain.local ([10.240.14.230]) with mapi id 14.03.0158.001; Wed, 18 Dec 2013 06:30:58 -0800 From: Jeff Whaley To: Rotary motors in aircraft Subject: [Fly Rotary] Re: Cooling Water Temp Thread-Topic: [Fly Rotary] Re: Cooling Water Temp Thread-Index: Ac77/cQepIBoM3u3Q9SNJsJF8g3Mzw== Date: Wed, 18 Dec 2013 14:30:58 +0000 Message-ID: <234B758DE9A64449BEB6BB5D1345CA7A36146048@mbx026-e1-nj-2.exch026.domain.local> Accept-Language: en-CA, en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-originating-ip: [209.87.232.162] Content-Type: multipart/related; boundary="_005_234B758DE9A64449BEB6BB5D1345CA7A36146048mbx026e1nj2exch_"; type="multipart/alternative" MIME-Version: 1.0 --_005_234B758DE9A64449BEB6BB5D1345CA7A36146048mbx026e1nj2exch_ Content-Type: multipart/alternative; boundary="_000_234B758DE9A64449BEB6BB5D1345CA7A36146048mbx026e1nj2exch_" --_000_234B758DE9A64449BEB6BB5D1345CA7A36146048mbx026e1nj2exch_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable To thermostat or not is indeed a debate; I have experienced both failed sta= tes of a thermostat (1 stuck open / 1 stuck closed) and therefore chose N= OT to put one in my aircraft. In hot weather conditions there is no real a= dvantage to having a thermostat; however, in severe cold climates there is.= Once I get back in the air with my machine I may experiment with one for = winter operations. As for radiator size that Tracy and others are using - it is about 700 Cu i= nches and not 540 ... see link: http://www.summitracing.com/parts/GRI-2-58= 185-X/ 22x13x3 =3D 858 cu in; subtract 2 inches off each end for tanks gives 18x13= x3 =3D 702 cu in ... I have the same radiator but not yet flying with it - = rebuilding. Jeff From: Stephen Izett Subject: Re: [FlyRotary] Re: Cooling Water Temp Date: Wed, 18 Dec 2013 17:17:36 +0800 To: Rotary motors in aircraft [Message Header] [Undecoded Message] Hi Neil I've listened over the years to the debate over thermostats. What makes sense to me is reducing the intake as much as possible and using= cowl flaps to increase the delta P across the face of the core/s and so to= minimise cooling drag. And I'm with you, I have never known a thermostat to fail and it seems its = a great way to stabilise and quickly establish operating temps. I took the one out of our Renesis 4 port and hope we'll be OK with our setu= p and add the cowl flaps as needed after testing. I have always found Paul L very helpful though some of the figures for radi= ator area and intake area are quite large (600cu inch) compared with a numb= er of flying examples that are cooling well. My research: (I believe the numbers are accurate) Ian Beadle RV6 - 374cu inch water cooler (similar to your setup me thinks) = He reduce his intake size significantly while still cooling. It was all abo= ut diffuser shape. Dave Leonard RV6 - 422cu inch water cooler (again similar under setup as yo= urs) Tracy's 3 rotor RV8 - 540cu inch fed by a 5 1/4" (22in2) intake. I have tri= ed to model of this setup. 2/3 of Tracy's would be 360cu inch cooler with an inlet area of 15in2. Ours is 540ch inch cooler with a 18in2 intake. Hoping our diffuser is somew= hat as efficient as Tracy's. Hey I'm not flying so my wisdom could be vapor. Cheers Steve Izett Perth Oz This message, and the documents attached hereto, is intended only for the a= ddressee and may contain privileged or confidential information. Any unauth= orized disclosure is strictly prohibited. If you have received this message= in error, please notify us immediately so that we may correct our internal= records. Please then delete the original message. Thank you. --_000_234B758DE9A64449BEB6BB5D1345CA7A36146048mbx026e1nj2exch_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

To thermostat or not is indeed a debate; I have expe= rienced both failed states of a thermostat (1 stuck open  /  1 st= uck closed) and therefore chose NOT to put one in my aircraft.  In hot= weather conditions there is no real advantage to having a thermostat; however, in severe cold climates there is.  Once= I get back in the air with my machine I may experiment with one for winter= operations.

 

As for radiator size that Tracy and others are using= – it is about 700 Cu inches and not 540 … see link:  http://www.sum= mitracing.com/parts/GRI-2-58185-X/

22x13x3 =3D 858 cu in; subtract 2 inches off each en= d for tanks gives 18x13x3 =3D 702 cu in … I have the same radiator bu= t not yet flying with it – rebuilding.

Jeff

 

 

From:

Stephen Izett <steveizett@me.com>=

Subject:

Re: [FlyRotary] Re: Cooling Water Temp<= /span>

Date:

Wed, 18 Dec 2013 17:17:36 +0800

To:

Rotary motors in aircraft <flyrotary= @lancaironline.net>

3D"Message

=

Hi Neil

 

I've listened over the years to the deb= ate over thermostats.

What makes sense to me is reducing the = intake as much as possible and using cowl flaps to increase the delta P acr= oss the face of the core/s and so to minimise cooling drag.

And I'm with you, I have never known a = thermostat to fail and it seems its a great way to stabilise and quickly es= tablish operating temps.

I took the one out of our Renesis 4 por= t and hope we'll be OK with our setup and add the cowl flaps as needed afte= r testing.

 

I have always found Paul L very helpful= though some of the figures for radiator area and intake area are quite lar= ge (600cu inch) compared with a number of flying examples that are cooling well. 

My research: (I believe the numbers are= accurate)

Ian Beadle RV6 - 374cu inch water coole= r (similar to your setup me thinks) He reduce his intake size significantly= while still cooling. It was all about diffuser shape.

Dave Leonard RV6 - 422cu inch water coo= ler (again similar under setup as yours)

Tracy's 3 rotor RV8 - 540cu inch fed by= a 5 1/4" (22in2) intake. I have tried to model of this setup.<= /p>

2/3 of Tracy's would be 360cu inch cool= er with an inlet area of 15in2.

Ours is 540ch inch cooler with a 18in2 = intake. Hoping our diffuser is somewhat as efficient as Tracy's.

 

Hey I'm not flying so my wisdom could b= e vapor.

 

Cheers

 

Steve Izett

Perth Oz

 

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