Return-Path: Received: from fed1rmmtao06.cox.net ([68.230.241.33] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 322319 for flyrotary@lancaironline.net; Thu, 15 Jul 2004 10:37:57 -0400 Received-SPF: error receiver=logan.com; client-ip=68.230.241.33; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao06.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040715143728.JKVW26045.fed1rmmtao06.cox.net@BigAl> for ; Thu, 15 Jul 2004 10:37:28 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: New Scoop Date: Thu, 15 Jul 2004 07:37:52 -0700 Message-ID: <000001c46a79$4f12b670$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C46A3E.A2B3DE70" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1165 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C46A3E.A2B3DE70 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Subject: [FlyRotary] Re: New Scoop=20 =20 Al, Thank you for posting the pics of the wing with oil cooler and = rad. I am running out of space to place an oil cooler without making a draggy installation. Did you do any type of flow testing maybe on another = Velocity to determine where to put the inlet in the wing? Did you do the installation during the build of the wing or was it done after the wing = was completed? Thanks for any help. Joe Berki Joe; =20 My wings were built by Alan Shaw (Wingco), so I did the entire cooler installations after the fact. Alan did a similar oil cooler = installation in the wing root of a Velocity 173 with an IO540 installation. He put two stock aircraft coolers side-by-side in the wing and found it cooled very well. I looked at what I could learn about the pressure and flow distribution on the wing surfaces, and did the best I could to get flow = and minimum drag. =20 =20 There isn't much flexibility where you locate them in the wing. They = have to be behind the spar (of course, the strake is in front), and you need = as much thickness as you can get. So you put the inlet right behind the = spar, and try to get the ducting to get good air flow and keep the core = relatively perpendicular to the flow. Hollow out the foam, smooth it out with relatively dry micro and a ply of BID. =20 In both the in-cowl radiator and the wing coolers I went for natural convection cooling while on the ground, hoping to avoid the need for a = fan. I have room for a fan in the cowl radiator if needed. I should have = some info on that aspect in a few weeks when I get the engine running on the plane. =20 Al ------=_NextPart_000_0001_01C46A3E.A2B3DE70 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Subject: [FlyRotary] Re: New Scoop

Al,
Thank you = for posting the pics of the wing with oil cooler and rad. I am running = out of space to place an oil cooler without making a draggy installation. = Did you do any type of flow testing maybe on another Velocity to determine = where to put the inlet in the wing? Did you do the installation during the = build of the wing or was it done after the wing was completed? Thanks = for any help.

Joe Berki

Joe;

My wings were built by Alan Shaw = (Wingco), so I did the entire cooler installations after the fact. Alan did = a similar oil cooler installation in the wing root of a Velocity 173 with = an IO540 installation. He put two stock aircraft coolers side-by-side = in the wing and found it cooled very well. I looked at what I could learn = about the pressure and flow distribution on the wing surfaces, and did the = best I could to get flow and minimum drag.

There isn’t much = flexibility where you locate them in the wing. They have to be behind the spar (of = course, the strake is in front), and you need as much thickness as you can = get. So you put the inlet right behind the spar, and try to get the ducting = to get good air flow and keep the core relatively perpendicular to the = flow. Hollow out the foam, smooth it out with relatively dry micro and a ply = of BID.

In both the in-cowl radiator and = the wing coolers I went for natural convection cooling while on the ground, = hoping to avoid the need for a fan. I have room for a fan in the cowl = radiator if needed. I should have some info on that aspect in a few weeks = when I get the engine running on the plane.

Al

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