X-Virus-Scanned: clean according to Sophos on Logan.com From: "Tracy" Received: from mail-qg0-f43.google.com ([209.85.192.43] verified) by logan.com (CommuniGate Pro SMTP 6.1c2) with ESMTPS id 7418141 for flyrotary@lancaironline.net; Thu, 15 Jan 2015 09:18:24 -0500 Received-SPF: pass receiver=logan.com; client-ip=209.85.192.43; envelope-from=rwstracy@gmail.com Received: by mail-qg0-f43.google.com with SMTP id z107so11835556qgd.2 for ; Thu, 15 Jan 2015 06:17:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=subject:references:from:content-type:in-reply-to:message-id:date:to :content-transfer-encoding:mime-version; bh=9Xpdtryh4bOWRaAxumD2GgunmicwEknzEmA9+dVIlX8=; b=c7rXqGVOEET0jj/PqF1OVoo1SodMtZEOYviyUI2jkANI47ooYI2kMMic5tpa1U9ISZ jufzmFnoRltG/9UCvG8BdlmiI4LqtN2vR0BdutBViSvOb//KVCuHEJVF8e4+af/B+myB MKStEgbaOFKtGxDSFl4VTJvuN/m7zbqZB3Hr8gQVdYFEky2CMn1rIYnhe/8aEvzv81Wa tdTwaM03Ysj2D2EEfLWKN8Evq2y51588KNkE7Cc5Rp3Gig1Egi5uqiMJllcImh1tSgrD CcN3FKOD2Y0IMtXmNt54NVkvnqXIuEAKPJdB4xg0uloAaMSJNpeBCYCDwX4CLH/T24pP fwUg== X-Received: by 10.224.120.8 with SMTP id b8mr16749441qar.36.1421331467047; Thu, 15 Jan 2015 06:17:47 -0800 (PST) Return-Path: Received: from [10.234.65.134] (125.sub-174-224-130.myvzw.com. [174.224.130.125]) by mx.google.com with ESMTPSA id c67sm1377465qgd.45.2015.01.15.06.17.34 for (version=TLSv1 cipher=ECDHE-RSA-RC4-SHA bits=128/128); Thu, 15 Jan 2015 06:17:45 -0800 (PST) Subject: Re: [FlyRotary] Re: First time run with Prop Load References: Content-Type: multipart/alternative; boundary=Apple-Mail-4DC42837-1B22-424C-A0DE-91E5B1DB8172 X-Mailer: iPad Mail (12B440) In-Reply-To: Message-Id: Date: Thu, 15 Jan 2015 09:17:26 -0500 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (1.0) --Apple-Mail-4DC42837-1B22-424C-A0DE-91E5B1DB8172 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Yes, flow rates are very different (about 35 - 40 GMP for the water) and wa= ter has a higher specific Heat (ie, calories per gram per deg F delta) than o= il. So the oil has to have a much higher delta to carry away the same amoun= t of heat. The lower flow rate just increases that factor. The oil also d= oes much more of the cooling job in a rotary than a piston engine. About 1/= 3 of of the cooling is via the oil. =20 Tracy Sent from my iPad > On Jan 15, 2015, at 05:47, steve Izett wrote= : >=20 > Hi Tracy > Thanks for the data. Any wisdom on why the difference? > I thought water would transfer heat faster than oil! Are the flow rates va= stly different? > Thanks again >=20 > Steve Izett >> On 15 Jan 2015, at 5:59 pm, Tracy wrote: >>=20 >> Glad to hear you're making progress Steve. A fixed regulator will make i= t harder to adjust for constant mixture across the whole range of throttle s= ettings but should be possible. I'm only seeing 5-10 degrees delta on water= but 40-50 degrees on oil at cruise power. I think that is typical. >>=20 >> Tracy >>=20 >> Sent from my iPad >>=20 >>> On Jan 15, 2015, at 04:12, steve Izett wro= te: >>>=20 >>> Hi Guys >>>=20 >>> I put the prop on the Glasair today and ran it with a load for the first= time! >>> Smother running and seams to be cooling thus far with 82F OAT. >>> Again - big thanks Tracy for making this possible. >>> What pressure do you guys have in your fuel rails, ours is a fixed regul= ator. >>>=20 >>> I=E2=80=99m in the garage at home so not taking the engine past 2400 RPM= . >>> Cant wait to get it down to our hangar and run it up properly! >>>=20 >>> Do you guys measure in and out of your coolers? >>> I=E2=80=99m getting a delta of about 13F on the oil cooler and very litt= le on the water. >>> Any wisdom, or data? >>>=20 >>> Thanks >>>=20 >>> Steve Izett >>> Glasair Super IIRG Renesis 4 port RD1-C EC2 EM3 >>>=20 >>> >>=20 >> -- >> Homepage: http://www.flyrotary.com/ >> Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/Lis= t.html >=20 --Apple-Mail-4DC42837-1B22-424C-A0DE-91E5B1DB8172 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable
Yes,  flow rates are very differe= nt (about 35 - 40 GMP for the water) and water has a higher specific Heat (i= e, calories per gram per deg F delta) than oil.  So the oil has to have= a much higher delta to carry away the same amount of heat.  The lower f= low rate just increases that factor.   The oil also does much more of t= he cooling job in a rotary than a piston engine.  About 1/3 of of the c= ooling is via the oil.  

Tracy
Sent from my iPad
On Jan 15, 2015, at 05:47, steve Izett <flyrotary@lancaironline.net> wrote:

Hi Tracy
Thanks for the data. Any wisd= om on why the difference?
I thought water would transfe= r heat faster than oil! Are the flow rates vastly different?
Thanks again

Steve Izett
On 15 Jan 2015, at 5:59 pm, Tracy <flyrotary@lancaironline.net> wrote:
Glad to hear you're ma= king progress Steve.  A fixed regulator will make it harder to adjust f= or constant mixture across the whole range of throttle settings but should b= e possible.  I'm only seeing 5-10 degrees delta on water but 40-50 degr= ees on oil at cruise power.  I think that is typical.

Tracy

Sent from my iPad

On Jan 15, 2015, at 04:12, steve Izett <flyrotary@lancaironline.net>= wrote:

Hi Guys

I p= ut the prop on the Glasair today and ran it with a load for the first time!<= br class=3D"">Smother running and seams to be cooling thus far with 82F OAT.=
Again - big thanks Tracy for making this possible.
What pressure do you guys have in your fuel rails, ours is a fixed regula= tor.

I=E2=80=99m in the garage at home so not t= aking the engine past 2400 RPM.
Cant wait to get it down to ou= r hangar and run it up properly!

Do you guys me= asure in and out of your coolers?
I=E2=80=99m getting a delta o= f about 13F on the oil cooler and very little on the water.
An= y wisdom, or data?

Thanks

Steve Izett
Glasair Super IIRG Renesis 4 port RD1-C EC= 2 EM3

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