Return-Path: Received: from fed1rmmtao10.cox.net ([68.230.241.29] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 576726 for flyrotary@lancaironline.net; Wed, 22 Dec 2004 10:44:19 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.29; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao10.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20041222154347.LDPZ7026.fed1rmmtao10.cox.net@BigAl> for ; Wed, 22 Dec 2004 10:43:47 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Oil Coolers Date: Wed, 22 Dec 2004 07:44:06 -0800 Message-ID: <000001c4e83d$1243f870$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4E7FA.0420B870" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C4E7FA.0420B870 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Subject: [FlyRotary] Re: Oil Coolers 1450 Btu/min seems high to me. That is 35HP. Where do these numbers come from, do others agree with this number? Alex Madsen My numbers come from heat balance plot for the rotary engine given as a function of the air/fuel ratio. I chose to use near max power (lambda of 1.15) for the design point. At that point the heat to the oil is about 7% of the total fuel burn energy. That percentage increases just slightly as the mixture is leaned to somewhere in the 8-9% range for lean cruise condition. The other interesting number is the heat to the coolant, which is about 18% at max power, and decreasing as the mixture is leaned, to about 11-12 % at lean cruise. The total heat energy from the fuel burn is about 150 Btu/min per output hp at lambda of 1.15. Al ------=_NextPart_000_0001_01C4E7FA.0420B870 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: Oil Coolers

1450 Btu/min seems high to me. That is 35HP. Where do these numbers = come from, do others agree with this number?

Alex Madsen

My numbers = come from heat balance plot for the rotary engine given as a function of the = air/fuel ratio. I chose to use near max power (lambda of 1.15) for the = design point. At that point the heat to the oil is about 7% of the total = fuel burn energy. That percentage increases just slightly as the = mixture is leaned to somewhere in the 8-9% range for lean cruise = condition.

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The other = interesting number is the heat to the coolant, which is about 18% at max power, and decreasing as the mixture is leaned, to about 11-12 % at lean = cruise.

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The total = heat energy from the fuel burn is about 150 Btu/min per output hp at lambda of = 1.15.

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