Return-Path: Received: from fed1rmmtao11.cox.net ([68.230.241.28] verified) by logan.com (CommuniGate Pro SMTP 4.2b8) with ESMTP id 321986 for flyrotary@lancaironline.net; Thu, 15 Jul 2004 01:51:57 -0400 Received-SPF: error receiver=logan.com; client-ip=68.230.241.28; envelope-from=ALVentures@cox.net Received: from BigAl ([68.107.116.221]) by fed1rmmtao11.cox.net (InterMail vM.6.01.03.02 201-2131-111-104-20040324) with ESMTP id <20040715055124.HLCU2273.fed1rmmtao11.cox.net@BigAl> for ; Thu, 15 Jul 2004 01:51:24 -0400 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: New Scoop Date: Wed, 14 Jul 2004 22:51:48 -0700 Message-ID: <000601c46a2f$d1bba7c0$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0007_01C469F5.255CCFC0" 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_0007_01C469F5.255CCFC0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Al, Its been hard to get good photos of this, because the lower cowling = makes up a good portion of the airflow path. Basically I have a standard Cozy = NACA scoop, with the oil cooler and radiator sitting flat, end-to-end beneath = the engine mount. =20 I have a curved deflector on the oil cooler to help the air make the = turn up and through the oil cooler. I have another one of those deflectors on = the radiator about half way back. =20 =20 The downside to this design, is that it takes pressure to make the air = turn, and go up through the radiators. The NACA does not work well that way. =20 What I'm trying to do is augment the existing scoop, with a "bolt on" = scoop ahead of it, which will capture air outside of the boundary layer, i.e. = high speed air, to improve cooling. =20 I made a scoop first, that while it worked somewhat, does not exclude = the boundary layer air. Also it's kind of like a funnel, with the largest = are at the opening and tapering down into the existing scoop. =20 I hope that makes some sense. =20 I think I've got it. Am I right that the x-sectional area of the flow ducting is always increasing? =20 Al ------=_NextPart_000_0007_01C469F5.255CCFC0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Al,

Its = been hard to get good photos of this, because the lower cowling makes up a good = portion of the airflow path.  Basically I have a standard Cozy NACA scoop, = with the oil cooler and radiator sitting flat, end-to-end beneath the engine = mount.

 

I = have a curved deflector on the oil cooler to help the air make the turn up and through = the oil cooler.  I have another one of those deflectors on the radiator = about half way back. 

 

The = downside to this design, is that it takes pressure to make the air turn, and go up = through the radiators.  The NACA does not work well that = way.

 

What = I’m trying to do is augment the existing scoop, with a “bolt on” = scoop ahead of it, which will capture air outside of the boundary layer, i.e. = high speed air, to improve cooling.

 

I = made a scoop first, that while it worked somewhat, does not exclude the boundary = layer air.  Also it’s kind of like a funnel, with the largest are = at the opening and tapering down into the existing = scoop.

 

I = hope that makes some sense.

 

I think I’ve got it.  = Am I right that the x-sectional area of the flow ducting is always = increasing?

 

Al

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