Return-Path: Received: from [24.25.9.103] (HELO ms-smtp-04-eri0.southeast.rr.com) by logan.com (CommuniGate Pro SMTP 4.2.5) with ESMTP id 576512 for flyrotary@lancaironline.net; Wed, 22 Dec 2004 07:48:26 -0500 Received-SPF: none receiver=logan.com; client-ip=24.25.9.103; envelope-from=eanderson@carolina.rr.com Received: from edward2 (cpe-069-132-111-212.carolina.rr.com [69.132.111.212]) by ms-smtp-04-eri0.southeast.rr.com (8.12.10/8.12.7) with SMTP id iBMCltCi022831 for ; Wed, 22 Dec 2004 07:47:56 -0500 (EST) Message-ID: <003501c4e824$33e74e00$2402a8c0@edward2> From: "Ed Anderson" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Oil Coolers Date: Wed, 22 Dec 2004 07:46:05 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0032_01C4E7FA.4ADF3980" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MIMEOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 X-Virus-Scanned: Symantec AntiVirus Scan Engine This is a multi-part message in MIME format. ------=_NextPart_000_0032_01C4E7FA.4ADF3980 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Actually, Alex , My calculations shows that at 5000 rpm and 12.5 = Air/Fuel ratio making 144 HP that the 13B oil heat content amounts to = around 2200 BTU/Min. Remember 1/3 of the engines waste heat is dumped = through the oil on the rotary, a much higher percentage than a = reciprocating engine. Ed ----- Original Message -----=20 From: Alex Madsen=20 To: Rotary motors in aircraft=20 Sent: Wednesday, December 22, 2004 2:55 AM 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? =20 Alex Madsen =20 -----Original Message----- From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] = On Behalf Of Al Gietzen Sent: Tuesday, December 21, 2004 10:32 PM To: Rotary motors in aircraft Subject: [FlyRotary] Re: Oil Coolers =20 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_0032_01C4E7FA.4ADF3980 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Actually, Alex , My calculations shows = that at 5000=20 rpm and 12.5 Air/Fuel ratio making 144 HP that the 13B oil heat content = amounts=20 to around 2200 BTU/Min. Remember 1/3 of the engines waste heat is = dumped=20 through the oil on the rotary, a much higher percentage than a = reciprocating=20 engine.

Ed

----- Original Message -----

From:=20 Alex=20 Madsen
To: Rotary motors in = aircraft

Sent: Wednesday, December 22, = 2004 2:55=20 AM

Subject: [FlyRotary] Re: Oil=20 Coolers

1450 = Btu/min seems=20 high to me. That is 35HP. Where=20 do these numbers come from, do others agree with this=20 number?

Alex=20 Madsen

-----Original=20 Message-----
From: = Rotary=20 motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of Al = Gietzen
Sent: Tuesday, December 21, = 2004 10:32=20 PM
To: Rotary = motors in=20 aircraft
Subject: = [FlyRotary]=20 Re: Oil Coolers

Subject:=20 [FlyRotary] Oil Coolers

I have=20 found some really nice oil coolers for aircraft (and other) at=20 http://lytron.com/standard/he_aluminum.asp They are a little expensive = but are=20 suppose to have great performance.

Does=20 anyone know how much what the average oil flow rate of the 13b is = (Gal/hour)=20 and the required heat dissipation (W) or (BTU/hour)=20

Alex=20 Madsen

Alex;

Heat=20 dissipation to the oil is between 10 and 11 Btu/min per hp. My = opinion=20 is to design for about 75-80% power, so for a NA 13B figure about 1450 = Btu/min.

I=92ve=20 seen different oil flow rate curves that don=92t quite agree; but best = figure=20 about 12 gpm at 5000 rpm, and fairly linear with RPM up to that point, = maybe=20 hits 15-16 gpm at 6500. I=92ve seen one dyno curve that maxed = out at about=20 11 gpm; who knows =96different pump, different back=20 pressure.

One=20 issue for us with rotarys is the flow rate 30% or so higher than the = typical=20 piston engine; so its worth checking the flow =96 pressure drop data = for =93stock=94=20 coolers designed for piston engine use.

Al

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