X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from poplet2.per.eftel.com ([203.24.100.45] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 4028270 for flyrotary@lancaironline.net; Fri, 18 Dec 2009 16:29:50 -0500 Received-SPF: none receiver=logan.com; client-ip=203.24.100.45; envelope-from=lendich@aanet.com.au Received: from sv1-1.aanet.com.au (mail.aanet.com.au [203.24.100.34]) by poplet2.per.eftel.com (Postfix) with ESMTP id 87D59173827 for ; Sat, 19 Dec 2009 05:29:13 +0800 (WST) Received: from ownerf1fc517b8 (203.171.92.134.static.rev.aanet.com.au [203.171.92.134]) by sv1-1.aanet.com.au (Postfix) with SMTP id DB09DBEC001 for ; Sat, 19 Dec 2009 05:29:11 +0800 (WST) Message-ID: From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Radiator/Oil Cooler Combo Date: Sat, 19 Dec 2009 07:29:15 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_003D_01CA807C.F7B959E0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Antivirus: avast! (VPS 091218-0, 12/18/2009), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_003D_01CA807C.F7B959E0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Thomas, Looking at your question and the answers, it appears that you most of = the answers you need, however I can expand on this slightly, my notes = say that oil under 160F for best power and never exceed 200F with 180F = being a nice upper limit for TO and climb - that how interpret it = anyway. I know other have exceed these figures without damage, but I'm = conservative by nature. Water is recommended not over 170F for best power and not to exceed = 180F . However Lynn put some figures up just recently that vary from = this slightly. The feeling I got from others is to not use the oil to water cooler = solution, I can't remember all the reasons, but they sounded logical. The rule of thumb I use is 3cu" to each HP for water and .8cu" to each = HP for oil. George ( down under)=20 I was watching a video that was created by Tim England regarding his = 4.3 V6 install in a velocity. =20 In his install he was running some sort of oil cooler that was a = combination oil filter mount with a heat exchanger working off of the = coolant from the radiator (or something to that effect.) His argument = for this approach centered around his belief that under extremely cold = temps at altitude, an oil cooler that is inside the radiator may make = the oil too cold to run at peak efficiency. i.e. keeping the oil at = around 195F was a better option under all temperature conditions. =20 So now I have these questions: =20 Does this philosophy translate to Rotary powered aircraft? Is the oil cooler/radiator a good solution?=20 If it is, do I need to use a different inch^3 figure per HP to derive = the correct radiator size? If the 195F oil solution seems viable, does anyone know of an oil = filter mount that includes a heat exchanger? =20 T Mann ------=_NextPart_000_003D_01CA807C.F7B959E0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Thomas,

Looking at your question and the = answers, it=20 appears that you most of the answers you need, however I can expand on = this=20 slightly, my notes say that oil under 160F for best power and never=20 exceed 200F with 180F being a nice upper limit for TO and climb - = that how=20 interpret it anyway. I know other have exceed these figures without = damage, but=20 I'm conservative by nature.

Water is recommended not = over 170F for=20 best power and not to exceed 180F . However Lynn put some figures up = just=20 recently that vary from this slightly.

The feeling I got from others is to not = use the oil=20 to water cooler solution, I can't remember all the reasons, but they = sounded=20 logical.

The rule of thumb I use is 3cu" to each = HP for=20 water and .8cu" to each HP for oil.

George ( down under)

I=20 was watching a video that was created by Tim England regarding his 4.3 = V6=20 install in a velocity.

In=20 his install he was running some sort of oil cooler that was a = combination oil=20 filter mount with a heat exchanger working off of the coolant from the = radiator (or something to that effect.) His argument for this approach = centered around his belief that under extremely cold temps at = altitude, an oil=20 cooler that is inside the radiator may make the oil too cold to run at = peak=20 efficiency. i.e. keeping the oil at around 195F was a better option = under all=20 temperature conditions.

So=20 now I have these questions:

Does this = philosophy translate=20 to Rotary powered aircraft?

Is=20 the oil cooler/radiator a good solution?

If=20 it is, do I need to use a different inch^3 figure per HP to derive the = correct=20 radiator size?

If=20 the 195F oil solution seems viable, does anyone know of an oil filter = mount=20 that includes a heat exchanger?

T=20 Mann

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