X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from wx-out-0506.google.com ([66.249.82.235] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2340166 for flyrotary@lancaironline.net; Wed, 19 Sep 2007 14:15:37 -0400 Received-SPF: pass receiver=logan.com; client-ip=66.249.82.235; envelope-from=msteitle@gmail.com Received: by wx-out-0506.google.com with SMTP id i27so201223wxd for ; Wed, 19 Sep 2007 11:15:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=beta; h=domainkey-signature:received:received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; bh=5uz4qrySeD+y+gaArBvMXx2WJBpchMbqrgr9fQaQPHo=; b=qivK5YOrDo8Y9mgiq33y4lBBmVOsvzA5aIot+LQ8pbk2LjLdEqbAjuPz94zxEmQg8BpaiyZ2Nivbajz4x9PzpopIosLSmk/yl2Z/yoM5VM2J6fYF2JkcyJRaiCZ+V+uxK6uAwpQfsCjtm8bPf25JKP/HFhfi/HyWrOhm5zZSbVg= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:references; b=mibnKwG8f1QyTBefFMYophawVPtTh/zmBE+2Kk278LV6ay9hsDg+gayTho5mQ2QyV6YKFdl3J6rPeRCbECsJvE7ruMM2RCLRcSC0hNHa7sN4QnqnoPx29EuW+x7bHvNPZYG7Iim6YspnI5Ew1myr0rNmgENwJCbajtHD0iIbIKg= Received: by 10.90.52.18 with SMTP id z18mr807551agz.1190225699940; Wed, 19 Sep 2007 11:14:59 -0700 (PDT) Received: by 10.90.35.16 with HTTP; Wed, 19 Sep 2007 11:14:59 -0700 (PDT) Message-ID: <5cf132c0709191114p39347c80lc3c575e56e85efd5@mail.gmail.com> Date: Wed, 19 Sep 2007 13:14:59 -0500 From: "Mark Steitle" To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] Re: Oil Delta - T In-Reply-To: MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_Part_17089_10900461.1190225699931" References: ------=_Part_17089_10900461.1190225699931 Content-Type: text/plain; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline Good data... Thanks, Mark On 9/19/07, Al Gietzen wrote: > > *Subject:* [FlyRotary] Oil Delta - T > > > > For those that are flying (rotaries), I'm curious as to what delta-T > you're seeing across the oil cooler. And at what speed you attain adequa= te > cooling. > > > > Mark S. > > I may not be the one to answer; because I consider my oiling cooling to b= e > marginal. I see only about 12 degree temp drop across the cooler, and ab= out > 120 increase in the air temp; clearly indicative of marginal air flow. > However; I do get adequate cooling at cruise of 150-160 KIAS the oil temp > runs 190-195 with OAT at 75 =96 85F. In full power climb at 120-130 KIAS= the > temp will get to 220F by the time I've climbed 3000' AGL, but that's a cl= imb > rate close to 2000 fpm; so I can pull back the power some shortly after > takeoff and keep the temp below 220. > > > > I've reshaped the diffuser inlet to the cooler, and sealed all the leakag= e > around the cooler, and it made little noticeable difference in the coolin= g. > Apparently the airflow before the inlet is a bit messed up by the gear > doors; and I may have to make the scoop inlet area larger. > > > > Al > > > ------=_Part_17089_10900461.1190225699931 Content-Type: text/html; charset=WINDOWS-1252 Content-Transfer-Encoding: quoted-printable Content-Disposition: inline
Good data... Thanks,
Mark

 
On 9/19/07, = Al Gietzen <ALVentures@cox.net= > wrote:

Subject: [FlyRotary] Oil Delta - T

<= span style=3D"FONT-SIZE: 12pt"> 

<= span style=3D"FONT-SIZE: 12pt">For those that are flying (rotaries), I'= m curious as to what delta-T you're seeing across the oil cooler. = And at what speed you attain adequate cooling.

<= span style=3D"FONT-SIZE: 12pt"> 

<= span style=3D"FONT-SIZE: 12pt">Mark S.

I may not be the one to answer;= because I consider my oiling cooling to be marginal.  I see only abou= t 12 degree temp drop across the cooler, and about 120 increase in the air = temp; clearly indicative of marginal air flow.  However; I do get adeq= uate cooling at cruise of 150-160 KIAS the oil temp runs 190-195 with OAT a= t 75 =96 85F.  In full power climb at 120-130 KIAS the temp will get t= o 220F by the time I've climbed 3000' AGL, but that's a climb rate close to= 2000 fpm; so I can pull back the power some shortly after takeoff and keep= the temp below 220.

 

I've reshaped the diffuser inle= t to the cooler, and sealed all the leakage around the cooler, and it made = little noticeable difference in the cooling.  Apparently the airflow b= efore the inlet is a bit messed up by the gear doors; and I may have to mak= e the scoop inlet area larger.

 

Al

 

<= /div>

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