Return-Path: Received: from fed1rmmtao07.cox.net ([68.230.241.32] verified) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 742940 for flyrotary@lancaironline.net; Thu, 17 Feb 2005 11:00:17 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.32; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao07.cox.net (InterMail vM.6.01.04.00 201-2131-117-20041022) with ESMTP id <20050217155930.RVKR11483.fed1rmmtao07.cox.net@BigAl> for ; Thu, 17 Feb 2005 10:59:30 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: induction scoop Date: Thu, 17 Feb 2005 07:59:31 -0800 Message-ID: <000001c51509$ab015f50$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="----=_NextPart_000_0001_01C514C6.9CDE1F50" 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 V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C514C6.9CDE1F50 Content-Type: multipart/alternative; boundary="----=_NextPart_001_0002_01C514C6.9CDE1F50" ------=_NextPart_001_0002_01C514C6.9CDE1F50 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Paul C wrote: =20 I was thinking of installing two small NACA ducts on the bottom of my cowling with two hoses coming up to feed air to my TWM throttlebody. = The NACA ducts I purchased from Van's RV (made for cowling ventilation) = already have a male outlet already molded in the assembly, so you just slide a = hose over it and secure with a clamp =20 --------------------------------------------- =20 Paul; =20 It would be better to have a single inlet if it can work to minimize = flow losses. The inlet area should be at least 4-5 sq in, and then that area should expand to about to maybe 4" diameter before the TB entrance for pressure recovery. A NACA scoop near the back of the plane isn't going = to get you much in the way of ram effect; but even the best ram scoop is = only going to get you about 0.3 - 0.4 psi boost at cruise. Just getting some unencumbered cool air in there is going to help. =20 Induction scoops are a bit tricky because when you start your takeoff = roll the inflow is completely dependant upon being "sucked" in, and you'd = like to have minimum entrance loss. At high speed you want a scoop design that maximizes the ram pressure, with minimum drag. The two conditions are = at odds. =20 The best compromise is a ram scoop with a well rounded entrance lip; = about a finger radius. Attached photo is my shot at a ram scoop. =20 Al =20 ------=_NextPart_001_0002_01C514C6.9CDE1F50 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Paul C wrote:

I was thinking of installing two small NACA ducts on the bottom of my = cowling with two hoses coming up to feed air to my TWM throttlebody. The = NACA ducts I purchased from Van's RV (made for cowling ventilation) already = have a male outlet already molded in the assembly, so you just slide a hose = over it and secure with a clamp

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Paul;

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It would be = better to have a single inlet if it can work to minimize flow losses. The = inlet area should be at least 4-5 sq in, and then that area should expand to about = to maybe 4" diameter before the TB entrance for pressure = recovery. A NACA scoop near the back of the plane isn’t going to get you much = in the way of ram effect; but even the best ram scoop is only going to get you = about 0.3 – 0.4 psi boost at cruise. Just getting some = unencumbered cool air in there is going to help.

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Induction = scoops are a bit tricky because when you start your takeoff roll the inflow is = completely dependant upon being "sucked" in, and you'd like to have = minimum entrance loss. At high speed you want a scoop design that = maximizes the ram pressure, with minimum drag. The two conditions are at = odds.

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The best = compromise is a ram scoop with a well rounded entrance lip; about a finger radius. = Attached photo is my shot at a ram scoop.

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Al

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