Return-Path: Received: from [65.54.169.54] (HELO hotmail.com) by logan.com (CommuniGate Pro SMTP 4.3c1) with ESMTP id 742446 for flyrotary@lancaironline.net; Thu, 17 Feb 2005 00:52:46 -0500 Received-SPF: pass receiver=logan.com; client-ip=65.54.169.54; envelope-from=lors01@msn.com Received: from mail pickup service by hotmail.com with Microsoft SMTPSVC; Wed, 16 Feb 2005 21:52:00 -0800 Message-ID: Received: from 4.171.174.137 by BAY3-DAV24.phx.gbl with DAV; Thu, 17 Feb 2005 05:51:10 +0000 X-Originating-IP: [4.171.174.137] X-Originating-Email: [lors01@msn.com] X-Sender: lors01@msn.com From: "Tracy Crook" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: I found the power Date: Thu, 17 Feb 2005 00:51:08 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00A8_01C5148A.C4631F80" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: MSN 9 X-MimeOLE: Produced By MSN MimeOLE V9.10.0011.1703 Seal-Send-Time: Thu, 17 Feb 2005 00:51:08 -0500 X-OriginalArrivalTime: 17 Feb 2005 05:52:00.0234 (UTC) FILETIME=[CC30B4A0:01C514B4] This is a multi-part message in MIME format. ------=_NextPart_000_00A8_01C5148A.C4631F80 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable 4 feet of 2.75" dia. SCAT running to a naca scoop on bottom of cowl was = enough to ruin the power on my installation. The difference between = this and my current short ram air scoop was dramatic. The power loss = was due to both pressure loss and heat rise but I don't know which was = predominate.=20 Keep air inlet plumbing clean, short and cool. It really does matter. =20 Tracy 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 --------------------------------------------- Paul, you will have to make sure the NACA ducts are mounted on a = pressure surface and not a suction surface or you may be very = disappointed in their recovery. How far do you have to route the air to = the T/B plenum. Tracy picked up a lot of heat when he used SCAT tube for = intake ducts and lost power. He was not sure whether it was pressure = loss of heat rise causing the problem. What do you say Tracy? I would be very tempted to copy Tracy's periscope and put hard smooth = pipe to the plenum to extract all the power possible. Bernie, DAR coming next Tuesday, still waiting my new injector >> Homepage: http://www.flyrotary.com/ >> Archive: = http://lancaironline.net/lists/flyrotary/List.html ------=_NextPart_000_00A8_01C5148A.C4631F80 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

4 feet of 2.75" dia. SCAT running to a naca scoop on bottom of cowl = was=20 enough to ruin the power on my installation. The difference = between this=20 and my current short ram air scoop was dramatic. The power = loss was=20 due to both pressure loss and heat rise but I don't know which was = predominate.=20

Keep air inlet plumbing clean, short and cool. It really does = matter.

Tracy

Paul=20 C wrote:

I was thinking of installing two small NACA = ducts on the=20 bottom of my cowling with two hoses coming up to feed air to my TWM=20 throttlebody. The NACA ducts I purchased from Van's RV (made for = cowling=20 ventilation) already have a male outlet already molded in the = assembly, so you=20 just slide a hose over it and secure with a=20 = clamp

---------------------------------------------

Paul, = you=20 will have to make sure the NACA ducts are mounted on a pressure = surface and=20 not a suction surface or you may be very disappointed in their = recovery. How=20 far do you have to route the air to the T/B plenum. Tracy picked up a = lot of=20 heat when he used SCAT tube for intake ducts and lost power. He was = not sure=20 whether it was pressure loss of heat rise causing the problem. What do = you say=20 Tracy?

I would be very tempted to copy Tracy's periscope and = put hard=20 smooth pipe to the plenum to extract all the power = possible.

Bernie,=20 DAR coming next Tuesday, still waiting my new = injector

>> =20 Homepage: http://www.flyrotary.com/
>&= gt; =20 Archive: http://lancai= ronline.net/lists/flyrotary/List.html

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