X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from omr-d04.mx.aol.com ([205.188.109.201] verified) by logan.com (CommuniGate Pro SMTP 6.0.8) with ESMTPS id 6735432 for flyrotary@lancaironline.net; Sun, 16 Feb 2014 19:52:16 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.109.201; envelope-from=shipchief@aol.com Received: from mtaout-mcd01.mx.aol.com (mtaout-mcd01.mx.aol.com [172.26.223.205]) by omr-d04.mx.aol.com (Outbound Mail Relay) with ESMTP id 4649B700000B4 for ; Sun, 16 Feb 2014 19:51:42 -0500 (EST) Received: from [192.168.1.107] (184-78-169-203.war.clearwire-wmx.net [184.78.169.203]) (using TLSv1 with cipher AES128-SHA (128/128 bits)) (No client certificate requested) by mtaout-mcd01.mx.aol.com (MUA/Third Party Client Interface) with ESMTPSA id 6158B38000090 for ; Sun, 16 Feb 2014 19:51:41 -0500 (EST) Subject: Re: [FlyRotary] Vortex Generator in air duct References: From: Scott Emery Content-Type: multipart/alternative; boundary=Apple-Mail-5--173244434 X-Mailer: iPhone Mail (8E600) In-Reply-To: Message-Id: Date: Sun, 16 Feb 2014 16:51:36 -0800 To: Rotary motors in aircraft Content-Transfer-Encoding: 7bit Mime-Version: 1.0 (iPhone Mail 8E600) x-aol-global-disposition: G DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mx.aol.com; s=20121107; t=1392598302; bh=/MD4UIWbYvuS00NZhtCgP4FGApbetCeRI3hSiz30qow=; h=From:To:Subject:Message-Id:Date:Mime-Version:Content-Type; b=YVOnd10KR7n5Q9AuD60Sw6RmEKGFE4Md9bEoXIOJ9HnnXMZai4azIgxdYxm3eKw3/ A+DX/IveFkbN/0/zF4X5gdZ04zIzWPn7v/AuVPMQ0WitcLdBf21ihztrhpHQryEgv/ 7GNslCMP40ROIlnArYiYy68/fFgrecH6zyOa/LS4= x-aol-sid: 3039ac1adfcd53015d1d706a X-AOL-IP: 184.78.169.203 --Apple-Mail-5--173244434 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii O don't get it. That pic is not sideways on my iPhone, but it is on my PC! Sent from my iPhone On Feb 16, 2014, at 4:46 PM, shipchief@aol.com wrote: > I was discussing the first few flights with some friends at the airplane a= few weeks ago, and mentioned the oil temp had reached 200F after climbing 3= 500 feet from take off. That was on a sub 40F day. > My oil cooler lays for and aft along the right cowl cheek, and all the air= from the right cowl inlet serves this cooler. I built a nice divergent duct= back to it, where the air must turn down and make a 90 degree turn to pass t= hru the cooler element. then it meets a louvered cover where the air turns a= ft 90 degrees to re-enter the free stream outside. > When looking into the mouth of the duct, you can see the aft third of the c= ooler. > Bob K a retired Boeing flight test engineer suggested I put a vortex gene= rator in the oil cooler duct to pull the air down along the divergent floor.= > So I did! I made a "Hall" type vortex generator, right out of a picture in= the Aircraft Spruce catalog, and stuck it into the center of the duct floor= , at the start of the divergent part. I bent it up out of a scrap of .025" a= luminum and stuck it in place with double sided carpet tape. > On my next flight, I noticed cooler oil temps generally, and specifically,= no temps near 200F during the initial climb to 4000 feet where I have been d= oing most of my early testing. Cruise temps run about 185F. We'll see what h= appens as the weather gets warmer. > > -- > Homepage: http://www.flyrotary.com/ > Archive and UnSub: http://mail.lancaironline.net:81/lists/flyrotary/List= .html --Apple-Mail-5--173244434 Content-Transfer-Encoding: 7bit Content-Type: text/html; charset=utf-8
O don't get it. That pic is not sideways on my iPhone, but it is on my PC!

Sent from my iPhone

On Feb 16, 2014, at 4:46 PM, shipchief@aol.com wrote:

I was discussing the first few flights with some friends at the airplane a few weeks ago, and mentioned the oil temp had reached 200F after climbing 3500 feet from take off. That was on a sub 40F day.
My oil cooler lays for and aft along the right cowl cheek, and all the air from the right cowl inlet serves this cooler. I built a nice divergent duct back to it, where the air must turn down and make a 90 degree turn to pass thru the cooler element. then it meets a louvered cover where the air turns aft 90 degrees to re-enter the free stream outside.
When looking into the mouth of the duct, you can see the aft third of the cooler.
 Bob K a retired Boeing flight test engineer suggested I put a vortex generator in the oil cooler duct to pull the air down along the divergent floor.
So I did! I made a "Hall" type vortex generator, right out of a picture in the Aircraft Spruce catalog, and stuck it into the center of the duct floor, at the start of the divergent part. I bent it up out of a scrap of .025" aluminum and stuck it in place with double sided carpet tape.
On my next flight, I noticed cooler oil temps generally, and specifically, no temps near 200F during the initial climb to 4000 feet where I have been doing most of my early testing. Cruise temps run about 185F. We'll see what happens as the weather gets warmer.
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