X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao104.cox.net ([68.230.241.42] verified) by logan.com (CommuniGate Pro SMTP 5.1.12) with ESMTP id 2340093 for flyrotary@lancaironline.net; Wed, 19 Sep 2007 13:33:22 -0400 Received-SPF: none receiver=logan.com; client-ip=68.230.241.42; envelope-from=alventures@cox.net Received: from fed1rmimpo01.cox.net ([70.169.32.71]) by fed1rmmtao104.cox.net (InterMail vM.7.08.02.01 201-2186-121-102-20070209) with ESMTP id <20070919173242.VXIN24061.fed1rmmtao104.cox.net@fed1rmimpo01.cox.net> for ; Wed, 19 Sep 2007 13:32:42 -0400 Received: from BigAl ([72.192.143.193]) by fed1rmimpo01.cox.net with bizsmtp id qHYj1X0044AaN600000000; Wed, 19 Sep 2007 13:32:43 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Oil Delta - T Date: Wed, 19 Sep 2007 10:33:03 -0800 Message-ID: <000c01c7faeb$83eca0d0$6401a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000D_01C7FAA8.75C960D0" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3138 Importance: Normal In-Reply-To: This is a multi-part message in MIME format. ------=_NextPart_000_000D_01C7FAA8.75C960D0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Oil Delta - T =20 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. =20 Mark S. I may not be the one to answer; because I consider my oiling cooling to = be marginal. I see only about 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 adequate cooling at cruise of 150-160 KIAS the oil = temp runs 190-195 with OAT at 75 - 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 = climb rate close to 2000 fpm; so I can pull back the power some shortly after takeoff and keep the temp below 220. =20 I've reshaped the diffuser inlet to the cooler, and sealed all the = leakage around the cooler, and it made little noticeable difference in the = cooling. 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. =20 Al =20 ------=_NextPart_000_000D_01C7FAA8.75C960D0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

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 adequate cooling.

Mark S.

I may not be the one to answer; = because I consider my oiling cooling to be marginal. I see only about 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 adequate = cooling at cruise of 150-160 KIAS the oil temp runs 190-195 with OAT at 75 – = 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 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 = inlet to the cooler, and sealed all the leakage around the cooler, and it made = little noticeable difference in the cooling. 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

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