X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from rwcrmhc14.comcast.net ([216.148.227.154] verified) by logan.com (CommuniGate Pro SMTP 5.1c.2) with ESMTP id 1311322 for flyrotary@lancaironline.net; Sun, 06 Aug 2006 22:43:13 -0400 Received-SPF: none receiver=logan.com; client-ip=216.148.227.154; envelope-from=rlwhite@comcast.net Received: from quail (c-68-35-160-229.hsd1.nm.comcast.net[68.35.160.229]) by comcast.net (rwcrmhc14) with SMTP id <20060807024217m140009dc8e>; Mon, 7 Aug 2006 02:42:27 +0000 Date: Sun, 6 Aug 2006 20:41:56 -0600 From: Bob White To: "Rotary motors in aircraft" Subject: Re: [FlyRotary] First flight - Oil temp Message-Id: <20060806204156.e390461b.rlwhite@comcast.net> In-Reply-To: References: X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.3; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="Multipart=_Sun__6_Aug_2006_20_41_56_-0600_mEAi8+2YC_aOBAoX" This is a multi-part message in MIME format. --Multipart=_Sun__6_Aug_2006_20_41_56_-0600_mEAi8+2YC_aOBAoX Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Hi Al, I'm sitting here trying to compile a program that won't, so I might as well give you my uninformed opinion. :) I agree with you that (c) would be worth a try. It's sort of brute force to get something to work, then try to clean it up later. I also wonder if the exit scoop might not work better if the slope went up more gradually, more like a triangle than a box. OK, I'll attach a picture. Bob W. On Sun, 6 Aug 2006 18:45:05 -0700 "Al Gietzen" wrote: > Thanks everyone for the congratulatory messages, and for the support that= is > always so helpful. No pics to post yet because my camera battery went de= ad > after the first three shots, so I=92m awaiting for shots from my friend w= ho > took hundreds (OK, only about 150) and will be editing for a while :-). >=20 > =20 >=20 > The principal issue of the day was the higher than comfortable oil > temperature; most likely due to insufficient air flow through the cooler. > For anyone who would like to think aerodynamics for awhile and give an > opinion on the simplest and best approach to remedy; read on. >=20 > =20 >=20 > The custom cooler for this 265 hp engine is large. The core here is abou= t 5 > =BC=94 wide, 22=94 long and 3 =BC=94 thick. It is located in the wing roo= t of the > Velocity, behind the spar, with inlet underneath and exit on the top. Al= an > Shaw, who I believe pioneered this approach, found the location worked ve= ry > well. When I discussed the installation with him years ago, he opined th= at > a scoop under the wing was probably not necessary because of a pressure > differential between bottom and top surfaces. Since then, my investigati= ons > of pressure distributions, and similar installations that aren=92t workin= g so > well, make me wonder. >=20 > =20 >=20 > Photo 1 is a view under the wing showing the OC air intake, wheel well, a= nd > the big armpit scoop for the coolant radiator in the cowl. The inlet > opening is about 1 1/8=94 wide and 23=94 long. There really isn=92t a sc= oop, just > an opening with an extended airfoil shaped lip which extends about =BD=94= into > the free stream. The idea was to minimize drag, and assume a more negati= ve > pressure at the exit would produce the necessary flow. Photo 2 shows a > front view where you see the wheel well and the inlet =96 very little > extension into the free stream. Analysis suggests that the turbulent > boundary layer on a smooth surface at the inlet location could be about 5= /8 > =96 3/4=94 in thick. >=20 > =20 >=20 > The air exit fairing is shown in photo 3; and is shaped as it is to maint= ain > attached flow and cause minimal turbulence going aft. The effective exit > area is about 1.6 times the inlet area. The thickness of the core sugges= ts > the need for pretty good pressure differential for adequate flow. >=20 > =20 >=20 > Here are some options: >=20 > a) For the first flight the landing gear was never retracted. Since the > open wheel well forward of the inlet would likely cause significant > turbulence; try another flight with the gear retracted to see if that > improves the results. >=20 > b) Place some VGs forward of the inlet to =91energize=92 the boundary = layer, > and see if that helps. >=20 > =20 >=20 > c) Extend the =91lip=92 of the inlet to form a proper ram scoop, poss= ible > also with VGs forward to break up the boundary layer, and accept the slig= ht > increase in drag. >=20 > =20 >=20 > d) Do something at the exit ( local =91expert=92 suggests there may be= flow > separation before the aft end of the fairing causing high pressure behind > the exit). Put VGs on the top of the exit fairing and/or reduce exit are= a. >=20 > =20 >=20 > e) None of the above. >=20 > =20 >=20 > I suspect the normal aerodynamic pressure differential between the inlet = and > outlet points is minimal; especially in level flight where it could be ne= ar > zero. Option c) seems the most sure-fire to me. >=20 > Thanks for input. >=20 > =20 >=20 > Al >=20 > =20 >=20 >=20 --=20 http://www.bob-white.com N93BD - Rotary Powered BD-4 (first engine start 1/7/06) Custom Cables for your rotary installation - http://www.roblinphoto.com/shop/ --Multipart=_Sun__6_Aug_2006_20_41_56_-0600_mEAi8+2YC_aOBAoX Content-Type: image/jpeg; name="OC_outlet_1-mod.jpg" Content-Disposition: attachment; filename="OC_outlet_1-mod.jpg" Content-Transfer-Encoding: base64 /9j/4AAQSkZJRgABAQEARgBGAAD//gAeTEVBRCBUZWNobm9sb2dpZXMgSW5jLiBWMS4wMf/bAEMA CAYGBwYFCAcHBwkJCAoMFA0MCwsMGRITDxQdGh8eHRocHCAkLicgIiwjHBwoNyksMDE0NDQfJzk9 ODI8LjM0Mv/bAEMBCQkJDAsMGA0NGDIhHCEyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIy MjIyMjIyMjIyMjIyMjIyMjIyMv/AABEIAWcC2AMBEQACEQEDEQH/xAAbAAEBAQEAAwEAAAAAAAAA AAAAAgMEAQUGB//EAEwQAQACAQIEAgYDCQsLBQAAAAACEgMEEwEFFFIiMgYRFUJiciOCkgchMTM0 U3GB0hYkQUNUVYSRosLRF1FhlKGjpLGy4vAmRFZldP/EABoBAQEBAQEBAQAAAAAAAAAAAAACAwEE 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