Return-Path: Received: from fed1rmmtao08.cox.net ([68.230.241.31] verified) by logan.com (CommuniGate Pro SMTP 4.2b5) with ESMTP id 148574 for flyrotary@lancaironline.net; Fri, 11 Jun 2004 10:27:02 -0400 Received: from smtp.west.cox.net ([172.18.180.57]) by fed1rmmtao08.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with SMTP id <20040611142632.TDXN2253.fed1rmmtao08.cox.net@smtp.west.cox.net> for ; Fri, 11 Jun 2004 10:26:32 -0400 From: Dale Rogers To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Cooling oil Date: Fri, 11 Jun 2004 10:26:30 -0400 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=____1086963990468_klr_')U94U" Message-Id: <20040611142632.TDXN2253.fed1rmmtao08.cox.net@smtp.west.cox.net> This is a multi-part message in MIME format. ------=____1086963990468_klr_')U94U Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Al, Perchance, did you forget that the 160 HP is *output*, not the total produced from the fuel burn? Dale R. COZY MkIV-R #1254 > > From: "Al Gietzen" > Date: 2004/06/11 Fri AM 12:46:45 EDT > To: "Rotary motors in aircraft" > Subject: [FlyRotary] Re: Cooling oil > > > > Subject: [FlyRotary] Re: Cooling oil > > > > > > ----- Original Message ----- > > From: "Joseph Berki" > > To: "Rotary motors in aircraft" > > Sent: Thursday, June 10, 2004 12:39 PM > > Subject: [FlyRotary] Re: Cooling oil > > > > > > > It would be interesting to measure flow in both engines. I thought that > > > both Lycoming and Mazda engines rejected 2/3 heat load through the > > > oil that is why I started going down this road. If the engines generated > > > the same Hp than the heat load should be similar. > > > > > > Joe Berki > > > > Joe, both engines may generate the same heat load, but the proportion > > rejected through the coolant in case of the Mazda is 2/3 of its waste heat > > while the oil rejects another 1/3 of the waste heat. Neither engine rejects > > anywhere near 2/3 of its waste heat through the oil. > > > > Most aircraft engines reject on the order of 300-600 BTU/Min through the > > oil, the Mazda at 160HP rejects approx 2446 BTU/Min through the oil. > > > > Ed Anderson > > > > Ed; > > > > That number looked a bit high to me, so I went in to my file to check. My > data shows 28% of the fuel burn energy in the rotary gets converted to HP, > 18% goes to the coolant, and about 7% to the oil. Most of the rest goes out > the exhaust pipe. For 160 HP output, I think that should be 1725 BTU/Min > going to the oil cooler. So about 3 times the comparable powered Lyc. > > > > Double check me on this. > > > > Al > > > > > > > ------=____1086963990468_klr_')U94U Content-Type: text/html; name="reply" Content-Disposition: inline; filename="reply"

 

Subject: [FlyRotary] Re: Cooling oil

 

 

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

From: "Joseph Berki" <joseph.berki@grc.nasa.gov>

To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Sent: Thursday, June 10, 2004 12:39 PM

Subject: [FlyRotary] Re: Cooling oil

 

 

> It would be interesting to measure flow in both engines.  I thought that

> both Lycoming and Mazda engines rejected 2/3 heat load through the

> oil  that is why I started going down this road.  If the engines generated

> the same Hp than the heat load should be similar.

>

> Joe Berki

 

Joe, both engines may generate the same heat load, but the proportion

rejected through the coolant in case of the Mazda is 2/3 of its waste heat

while the oil rejects another 1/3 of the waste heat.  Neither engine rejects

anywhere near 2/3 of its waste heat through the oil.

 

Most aircraft engines reject on the order of 300-600 BTU/Min through the

oil, the Mazda at 160HP rejects approx 2446 BTU/Min through the oil.

 

Ed Anderson

 

Ed;

 

That number looked a bit high to me, so I went in to my file to check.  My data shows 28% of the fuel burn energy in the rotary gets converted to HP, 18% goes to the coolant, and about 7% to the oil. Most of the rest goes out the exhaust pipe. For 160 HP output, I think that should be 1725 BTU/Min going to the oil cooler.  So about 3 times the comparable powered Lyc.

 

Double check me on this.

 

Al

 

 

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