Return-Path: Received: from fed1mtao04.cox.net ([68.6.19.241] verified) by logan.com (CommuniGate Pro SMTP 4.1.8) with ESMTP id 2928606 for flyrotary@lancaironline.net; Mon, 12 Jan 2004 02:12:39 -0500 Received: from BigAl ([68.107.116.221]) by fed1mtao04.cox.net (InterMail vM.5.01.06.05 201-253-122-130-105-20030824) with ESMTP id <20040112071233.OBGQ3905.fed1mtao04.cox.net@BigAl> for ; Mon, 12 Jan 2004 02:12:33 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Radiator ducting Date: Sun, 11 Jan 2004 23:12:42 -0800 Message-ID: <000001c3d8db$78a4a780$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C3D898.6A816780" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C3D898.6A816780 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: [FlyRotary] Re: Radiator ducting john wrote: > Finn; I measured the inlets on the Lopresti, pipers at Oshkosh and > the inlets were 5 1/4". JohnD You guys might want to keep in mind that for the same hp the aircooled engine can generally get by with less air flow because the average fin temp may be close to 100 degrees hotter than we can run our coolant radiators; even though our radiators make more efficient use of the surface area. The typical 200 hp water cooled system might take about 60 - 65 sq. in. of intake area for cooling on a 90F day. That Piper has about 42 sq. in. for what is likely a 250hp engine. Al ------=_NextPart_000_0001_01C3D898.6A816780 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: Radiator ducting

 

john wrote:

 

> Finn;  I measured the inlets on the Lopresti, pipers at = Oshkosh and

> the inlets were 5 1/4".  JohnD

 

You guys = might want to keep in mind that for the same hp the aircooled engine can generally get = by with less air flow because the average fin temp may be close to 100 = degrees hotter than we can run our coolant radiators; even though our radiators = make more efficient use of the surface area. 

 <= /font>

The typical = 200 hp water cooled system might take about 60 – 65 sq. in. of intake = area for cooling on a 90F day.  That Piper has about 42 sq. in. for what is = likely a 250hp engine.

 <= /font>

Al

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