Return-Path: Received: from fed1rmmtao11.cox.net ([68.230.241.28] verified) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 576230 for flyrotary@lancaironline.net; Tue, 21 Dec 2004 22:32:38 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.28; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao11.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20041222033204.YRQL28808.fed1rmmtao11.cox.net@BigAl> for ; Tue, 21 Dec 2004 22:32:04 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Oil Coolers Date: Tue, 21 Dec 2004 19:32:22 -0800 Message-ID: <000001c4e7d6$d975f360$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C4E793.CB52B360" 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_01C4E793.CB52B360 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Oil Coolers =20 I have found some really nice oil coolers for aircraft (and other) at http://lytron.com/standard/he_aluminum.asp They are a little expensive = but are suppose to have great performance. Does anyone know how much what the average oil flow rate of the 13b is (Gal/hour) and the required heat dissipation (W) or (BTU/hour)=20 =20 Alex Madsen=20 =20 Alex; =20 Heat dissipation to the oil is between 10 and 11 Btu/min per hp. My = opinion is to design for about 75-80% power, so for a NA 13B figure about 1450 Btu/min. =20 I've seen different oil flow rate curves that don't quite agree; but = best figure about 12 gpm at 5000 rpm, and fairly linear with RPM up to that point, maybe hits 15-16 gpm at 6500. I've seen one dyno curve that = maxed out at about 11 gpm; who knows -different pump, different back pressure. =20 One issue for us with rotarys is the flow rate 30% or so higher than the typical piston engine; so its worth checking the flow - pressure drop = data for "stock" coolers designed for piston engine use. =20 Al ------=_NextPart_000_0001_01C4E793.CB52B360 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Oil Coolers

 

I have found = some really nice oil coolers for aircraft (and other) at http://lytron.com/standard/he_aluminum.asp They are a little expensive = but are suppose to have great performance.

Does anyone know = how much what the average oil flow rate of the 13b is (Gal/hour) and the required = heat dissipation (W) or (BTU/hour)

 

Alex Madsen =

 

Alex;

 

Heat dissipation to the oil is = between 10 and 11 Btu/min per hp.  My opinion is to design for about 75-80% = power, so for a NA 13B figure about 1450 Btu/min.

 

I’ve seen different oil = flow rate curves that don’t quite agree; but best figure about 12 gpm at = 5000 rpm, and fairly linear with RPM up to that point, maybe hits 15-16 gpm at = 6500.  I’ve seen one dyno curve that maxed out at about 11 gpm; who knows = –different pump, different back pressure.

 

One issue for us with rotarys is = the flow rate 30% or so higher than the typical piston engine; so its worth checking the flow – pressure drop data for “stock” = coolers designed for piston engine use.

 

Al

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