X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail-wy0-f180.google.com ([74.125.82.180] verified) by logan.com (CommuniGate Pro SMTP 5.3.11) with ESMTP id 4639313 for flyrotary@lancaironline.net; Mon, 13 Dec 2010 09:07:27 -0500 Received-SPF: pass receiver=logan.com; client-ip=74.125.82.180; envelope-from=rwstracy@gmail.com Received: by wyb28 with SMTP id 28so6072888wyb.25 for ; Mon, 13 Dec 2010 06:06:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:sender:received :in-reply-to:references:date:x-google-sender-auth:message-id:subject :from:to:content-type; bh=T9R4yAidFWUF9N+9s8B/0QxV6lISjUNz1RT9CR7QL38=; b=lDYwIWroj4E1qrlbUHRCH6HXFVKfQbCE8zWLBB0mWslSO9LItseTdw8HxO8FeGNpVP 1cNqsQOlgFA4CBUplr0F/BlI0XMaZxuqjMHIXxr3pu5bIoaWGTH4aI8gqpw1uXsfbmLU 10IFtiSQEIYw/B4zkoISdrw8HyuPwN3vD1cAo= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:content-type; b=TMDiQAgay95gBBKCyBYJB0SaHWa+wMh7Gem4mtUDPCACm17guD6PATJ/HcyNX0G4lI VUiLIwscRWCFo/+NqXn0cEtPjJcasaJpeigBusBc/yy6qnPvzmDn/ssVPly4rpIj7j2s 6ru3ryYZY9aMwiG72RFvDrSSB0t2xk6/dl2gU= MIME-Version: 1.0 Received: by 10.216.90.79 with SMTP id d57mr2972435wef.65.1292249211594; Mon, 13 Dec 2010 06:06:51 -0800 (PST) Sender: rwstracy@gmail.com Received: by 10.216.15.169 with HTTP; Mon, 13 Dec 2010 06:06:51 -0800 (PST) In-Reply-To: References: Date: Mon, 13 Dec 2010 09:06:51 -0500 X-Google-Sender-Auth: 6vX6LF5Zh0pERRmqFDasM0_-fqQ Message-ID: Subject: Re: [FlyRotary] Fw: Water temps From: Tracy To: Rotary motors in aircraft Content-Type: multipart/alternative; boundary=0016e6d7e03437e9a504974b370a --0016e6d7e03437e9a504974b370a Content-Type: text/plain; charset=ISO-8859-1 At typical cruise power settings I'm only seeing about 8 - 10 degrees of Delta between hot & cold coolant on 13B. I see more on the Renesis where the exhaust ports add more heat to the coolant. Can't remember the exact amount but it was significant. I see 40 - 50 degrees on oil Delta depending on power setting. Adding more heat to the coolant with oil cooler or exhaust has surprisingly little effect on required radiator size. This is because the higher delta T between air and coolant increases radiator efficiency. For example, increasing water temp in by 6 degrees would only raise temp out by 2 degrees under the same coolant and air flow conditions. For this reason, placing the oil-water heat exchanger in the engine coolant outlet (before the rad) is the best way to go IF it gives you the required oil cooling. Tracy On Mon, Dec 13, 2010 at 3:23 AM, Kelly Troyer wrote: > Group, > CosyGirrrls still unable to post................... > ----- Forwarded Message ---- > *From:* "CozyGirrrl@aol.com" > *To:* keltro@att.net > *Sent:* Mon, December 13, 2010 12:13:22 AM > *Subject:* Water temps > > "Cooled high pressure water" > Anybody have data on the temp of "cool" water exiting the radiator? -vs- > temp of water entering the radiator? > How much a change in water radiator size would be appropriate when > switching to a oil/water cooler to compensate for the added heat load on the > radiator? > ...Chrissi > > --0016e6d7e03437e9a504974b370a Content-Type: text/html; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable At typical cruise power settings I'm only seeing about 8 - 10 degrees o= f Delta between hot & cold coolant on 13B.=A0 I see more on the Renesis= where the exhaust ports add more heat to the coolant.=A0 Can't remembe= r the exact amount but it was significant.=A0 I see =A0 40 - 50 degrees on = oil Delta depending on power setting.

Adding more heat to the coolant with oil cooler or exhaust has surprisi= ngly little effect on required radiator size.=A0 This is because the higher= delta T between air and coolant increases radiator efficiency.=A0=A0=A0 Fo= r example, increasing water temp in by 6 degrees would only raise temp out = by 2 degrees under the same coolant and air flow conditions.=A0 For this re= ason, placing the oil-water heat exchanger in the engine coolant outlet (be= fore the rad)=A0 is the best way to go IF it gives you the required oil coo= ling.

Tracy

On Mon, Dec 13, 2010 at 3:23 AM= , Kelly Troyer <kelt= ro@att.net> wrote:
Group,
=A0=A0 CosyGirrrls still unable to post...................
----- Forwarded Message ----
From: "CozyGirrrl@aol.com" <CozyGirrrl@aol.com>
To: keltro@att.net
Sent: Mon, December 13, 2010 12:13:22 AM
Subject: Water temps

"Cooled high pressure water"
Anybody have data on the temp of "cool" water exiting the ra= diator? -vs- temp of water entering the radiator?
How much a change in water radiator size would be appropriate when swi= tching to a oil/water cooler to compensate for the added heat load on the r= adiator?
...Chrissi
=A0

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