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| | NACA Duct Technical Information</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>ducts</b> are useful when air needs to be drawn into an area which isn't exposed to the direct air flow the scoop has access to. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The <b>NACA</b> <b>duct</b> takes advantage of the <a href="/topics/Boundary-layer" title="Boundary layer" class=fl>Boundary layer</a>, a layer of slow moving air that "clings" to the bodywork of the car, especially where the bodywork flattens, or does not accelerate or decelerate the air flow. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Anyway, the <b>NACA</b> <b>duct</b> scavenges this slower moving area by means of a specially shaped <a href="/topics/Intake" title="Intake" class=fl>intake</a>.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.stockcarproducts.com /naca.htm</font> (193 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://home.hiwaay.net/~langford/nacaducts">KR2S NACA ducts</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> In an effort to make the cooling air from the cowling reenter the airstream with as little <a href="/topics/Drag" title="Drag" class=fl>drag</a> as possible, I decided to use <b>NACA</b> <b>ducts</b> to reintroduce the flow from the bottom of the cowling back under the fuselage. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Using a drawing out of Tony Bengelis' "Sportplane Construction Techniques" (and it's also available from a <b>NACA</b> report that originally devised the formula), I plotted out the <b>ducts</b> after determining the depth and length that I needed. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Here's where I put the actual <b>NACA</b> <b>duct</b> plot to work, using it as a template to cut the actual <b>ducts</b> out by cutting along the lines.</td></tr>
<tr><td></td><td colspan=2><font color=gray>home.hiwaay.net /~langford/nacaducts</font> (888 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.angelfire.com/mech/gam3r84/NACA.html">NACA Ducts</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>ducts</b> are useful when air needs to be drawn into an area which isn't exposed to the direct air flow the scoop has access to. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> In short, they are submerged, low-drag <b>ducts</b> used primarily for drawing air from flat surfaces, parallel to the airflow. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Anyway, the <b>NACA</b> <b>duct</b> scavenges this slower moving area by means of a specially shaped <a href="/topics/Intake" title="Intake" class=fl>intake</a>.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.angelfire.com /mech/gam3r84/NACA.html</font> (215 words)</td></tr>
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<tr><td> </td><td colspan=2><u>NACA Duct Encyclopedia Article @ HotAndCold.com (Hot and Cold)</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The <b>NACA</b> <b>duct</b> or <b>NACA</b> scoop is a common form of low-drag <a href="/topics/Intake" title="Intake" class=fl>intake</a> design, originally developed by the National Advisory Committee for Aeronautics in <a href="/topics/1945" title="1945" class=fl>1945</a>. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> When properly implemented, it allows fluid to be drawn into an internal <b>duct</b>, often for cooling purposes, with a minimal disturbance to the flow. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The design was originally called a "submerged inlet," since it consists of a shallow ramp with curved walls recessed into the exposed surface of a streamlined body, such as an aircraft.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.hotandcold.com /encyclopedia/NACA_duct</font> (354 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.lightspeedengineering.com/Services/NACAduct.htm">Light Speed Engineering - Services- NACA Duct</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Light Speed Engineering's <b>NACA</b> <b>ducts</b> are lightweight and easy to install due to their attachment flange. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> They have also been aerodynamically optimized featuring a large inside radius for better pressure recovery and a large diffuser that reaches well into the engine compartment to avoid the typical abrupt separation of airflow at the firewall. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>Duct</b> Installation on a Long-EZ, viewed from rear, upside-down.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.lightspeedengineering.com /Services/NACAduct.htm</font> (92 words)</td></tr>
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<tr><td> </td><td colspan=2><u>Aerodynamics</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> is one of the predecessors of NASA. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The purpose of a <b>NACA</b> <b>duct</b> is to increase the flowrate of air through it while not disturbing the <a href="/topics/Boundary-layer" title="Boundary layer" class=fl>boundary layer</a>. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The reason why the <b>duct</b> is narrow, then suddenly widens in a graceful arc is to increase the cross-sectional area slowly so that airflow does separate and cause turbulence (and <a href="/topics/Drag" title="Drag" class=fl>drag</a>).</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.up22.com /Aerodynamics.htm</font> (2900 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.revlimiter.net/mods/duct.html">revlimiter.net - NACA duct intake</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> A <b>NACA</b> <b>duct</b> is a common form of low-drag <a href="/topics/Intake" title="Intake" class=fl>intake</a> design, originally developed by the National Advisory Committee for Aeronautics in <a href="/topics/1945" title="1945" class=fl>1945</a>. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> A few words on implementing your own <b>NACA</b> <b>duct</b> as a means of induction to your race car. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The <b>duct</b> is designed to be efficient with the correct wall angles (sharp), base slope, and width-to-depth ratio.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.revlimiter.net /mods/duct.html</font> (798 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.gmecca.com/byorc/dtipsaerodynamics.html">Race Car Design Tips and Information - Aerodynamics</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>ducts</b> are useful when air needs to be drawn into an area which isn't exposed to the direct air flow the scoop has access to. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The <b>NACA</b> <b>duct</b> takes advantage of the <a href="/topics/Boundary-layer" title="Boundary layer" class=fl>Boundary layer</a>, a layer of slow moving air that "clings" to the bodywork of the car, especially where the bodywork flattens, or does not accellerate or decellerate the air flow. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Vorticies are also generated by the "walls" of the <b>duct</b> shape, aiding in the scavenging.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.gmecca.com /byorc/dtipsaerodynamics.html</font> (2766 words)</td></tr>
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<tr><td> </td><td colspan=2><u>Engine Cooling System</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> This differs from the factory <b>ducts</b> which are shaped differently due to the use of larger scoops. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> These <b>ducts</b> are specially molded to mate with the Hangar 18 <b>NACA</b> scoops and modified factory plenum. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Flanges for the molded <b>ducts</b> are fabricated in the next photos with layup made over the <b>duct</b> tape on the plenum.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.rguerra.com /velocity/engineCooling/engineCooling.html</font> (551 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://circletrack.com/techarticles/driver_cooling_system_tech_types_review">Driver Cooling Systems — Tech, Types, Review — Circle Track Magazine</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> A <b>NACA</b> <b>duct</b> is a plastic component usually fitted within the side windows of the car. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The Koolbox is a thermal electric device that collects air from a <b>NACA</b> <b>duct</b> and takes it through a filter internal in the unit. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The <b>duct</b> is usually placed within the side windows and allows air from around the car to blow into the cockpit.</td></tr>
<tr><td></td><td colspan=2><font color=gray>circletrack.com /techarticles/driver_cooling_system_tech_types_review</font> (2485 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.chris-longhurst.com/nacavents">NACA ducts for your BMW R1150GS</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>ducts</b> are designed to separate the <a href="/topics/Boundary-layer" title="Boundary layer" class=fl>boundary layer</a> of air flowing over a surface. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>ducts</b> have a zillion variables determining size, spacing, speed rations, <b>duct</b> angles etc etc etc. I found the diagram below and used it as the basis of my <b>ducts</b>. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> I tried the newly <b>ducted</b> screen in all three positions, travelling into wind, with the wind and across the wind, at speeds up to 90mph.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.chris-longhurst.com /nacavents</font> (2057 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.sportcompactcarweb.com/tech/0610sccp_automotive_aerodynamics_part_2/index3.html">Automotive Aerodynamics - Sport Compact Car Magazine</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Side <b>ducts</b> are primarily seen on race cars for two reasons, because brake and engine cooling is crucial, and because most serious race cars will use a front underbody diffuser that channels airflow toward the rear of the front wheel well. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Side <b>ducting</b> not only provides a smooth outlet for these hot and turbulent gasses, but also turns the flow to exit smoothly along the side of the car instead of directly outward, which would interfere with the turbulent curtain generated by the canards. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>ducts</b> are low-drag <a href="/topics/Intake" title="Intake" class=fl>intake</a> channels used for a variety of cooling requirements such as brakes, engine, and even the poor overheated driver.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.sportcompactcarweb.com /tech/0610sccp_automotive_aerodynamics_part_2/index3.html</font> (872 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://home.earthlink.net/~jonaa/Brakeducts.html">Jon's Brake Ducts</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Once you get that close you'll need to place the <b>duct</b> behind the hole and gradually take the hole up to size to match the <b>duct</b> (so that the edges of the hole are even with the side walls of the <b>duct</b>). </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> For the <b>NACA</b> <b>duct</b> to flow efficiently, you need to shape the cut in the bumper cover in a specific manor. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Attach it to the <b>ducts</b> using a hose clamp, through the holes in the lower panels and to the end pipes.</td></tr>
<tr><td></td><td colspan=2><font color=gray>home.earthlink.net /~jonaa/Brakeducts.html</font> (2017 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.afxmfg.com/AFXFiberglass.html">AFX Manufacturing Fiberglass Products</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>Duct</b> Hood for 95-99 Dodge, Plymouth, and Chrysler Neon </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>Duct</b> Hood for 2000 On Dodge, Plymouth, and Chrysler Neon. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> <b>NACA</b> <b>Duct</b> Hood for 95 On Dodge Stratus, Plymouth Breeze, and Chrysler Cirrus.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.afxmfg.com /AFXFiberglass.html</font> (193 words)</td></tr>
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<tr><td> </td><td colspan=2><u>Re: Miata NACA Duct</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Subject: Re: Miata <b>NACA</b> <b>Duct</b> Is it meant to replace the body colored panel that is level with the hood when the headlight is down? </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> You could reshape the <a href="/topics/Intake" title="Intake" class=fl>intake</a> snorkel to face the <b>NACA</b> <b>duct</b>, but then you might have the rainwater-entry issue again. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> However, I'm intested in the <b>NACA</b> <b>duct</b> as an additional measure for cooling things down under the hood.</td></tr>
<tr><td></td><td colspan=2><font color=gray>realbig.com /miata/1993-10/6.html</font> (282 words)</td></tr>
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<tr><td> </td><td colspan=2><u>Aerodynamic engineering - Vent Design</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> I have a <b>NACA</b> <b>Duct</b> (from a Nascar rear window) mounted in the lower engine shroud to bring cool air into the engine compartment. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> There are three good reasons to use a <b>NACA</b> inlet, however: attempting to reduce ingestion of debris (as SparWeb has pointed out), reducing tooling and manufacturing costs relative to a smoothly-contoured scoop inlet, and reducing running <a href="/topics/Drag" title="Drag" class=fl>drag</a> of systems that require only intermittent use of an inlet. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> At first I had considered a <b>NACA</b> vent till I had a better understanding of their purpose, while they look 'cool' I realize now they are really an <a href="/topics/Intake" title="Intake" class=fl>intake</a> and not used to exhaust.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.eng-tips.com /viewthread.cfm?qid=61524&page=10</font> (1807 words)</td></tr>
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<tr><td> </td><td colspan=2><u>NACA Duct Questions....For those of you with experience :) - RX-7 Owners Club</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> this is impossible to answer since the amount/velocity of air being brought through the <b>duct</b> is directly related to the amount/velocity over the actual <b>duct</b> as well as pressure on both sides of the duct...not to mention what size the <b>duct</b> is example; <b>duct</b> on the windshield vs on the rear window. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The inlet of a <b>NACA</b> <b>duct</b> needs to be in a High pressure area, not a low pressure area. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The advantage of a <b>NACA</b> <b>duct</b> is much lower <a href="/topics/Drag" title="Drag" class=fl>drag</a> for the airflow compared to other scoop type <b>ducts</b>.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.rx7club.com /showthread.php?p=6935784#post6935784</font> (1022 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.rcuniverse.com/forum/m_3248964/anchors_3271225/mpage_2/key_/anchor/tm.htm">RE: Engine Cooling - Inlet & Exit</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Here the <b>duct</b> form is used in the bottom sheet of the car to keep the flow adhered to the curved up section at the rear, and thus help the car to cling to the road. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Some literature describes vortices generated by the <b>NACA</b> <b>duct</b> sidewalls as contributing to the suction effect, when in fact, it is far from being the principal action. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Such is the reason for employing the <b>NACA</b> <b>duct</b> in reverse, which conditions the exhaust airflow by increasing it velocity steadily before re-entering the slipstream.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.rcuniverse.com /forum/m_3248964/anchors_3271225/mpage_2/key_/anchor/tm.htm</font> (2723 words)</td></tr>
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<tr><td> </td><td colspan=2><u>Mulsanne's Corner: 2003 Pilbeam MP91</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The <b>duct</b> primarily functions to pull diffuser air from the underbody though it would appear that wheel well air is siphoned off as well. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Three <b>NACA</b> <b>ducts</b> adorn each side of the bottom with at least one providing cooling air for the front brakes. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The function of the other two is somewhat of a mystery, though the <b>duct</b> furthest inboard (and probably the one next to it as well) clearly works in conjunction with the diffuser kick.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.mulsannescorner.com /pilbeammp91-1.html</font> (157 words)</td></tr>
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<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> A set of vortex generators is fitted inside the <a href="/topics/Intake" title="Intake" class=fl>intake</a> <b>ducts</b> to provide a homogeneous flow of air to the engine. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> These blow-in doors were a set of auxiliary inlets which enabled extra airflow to reach the inlet <b>duct</b> during takeoff or when the engine is at full power but the aircraft is moving slowly. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> These blow-in doors are a set of auxiliary inlets placed on the sides of the main <a href="/topics/Intake" title="Intake" class=fl>intakes</a> which enable extra airflow to reach the engine inlet <b>ducts</b> during takeoff or when the engines are at full power but the aircraft is moving slowly.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.f-111.net /JoeBaugher.htm</font> (11837 words)</td></tr>
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<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Then the supplied <b>ducting</b> was cut, the upper section was covered with foil tape and laid up with BID to create a mating flange on the lower (outlet) section. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Next two holes are drilled in the <b>duct</b> for the hot air outlet, and the aluminum sheet is cut per the template to form the flapper valve. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> We're also going to use the keel as a heater <b>duct</b> to route the air to the passengers (which is possible with the fixed gear plane, with far less equipment in there), which is an idea that the factory kind of liked.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.velocityxl.com /Engine.htm</font> (3008 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.stearman.net/forum/messageview.cfm?catid=3&threadid=1843">Stearman Restorers Association Forums - Jasco Alt - Air Duct</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> I see no big problem in running without an air <b>duct</b> in your specific application but I would vote for installing one just because the manufacture specifies that one should be installed. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> I have a hidden <b>duct</b> on my alternator because, like you, I did not want to cut a hole in the skin. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The guy who did the rebuild installed a small <b>NACA</b> <b>duct</b> thorugh the stationary cowling on top of the engine to provide cooling air to the alternator.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.stearman.net /forum/messageview.cfm?catid=3&threadid=1843</font> (1014 words)</td></tr>
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<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Kit includes a hood scoop, an under <b>ducting</b>, and one small <b>NACA</b> <b>duct</b>. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The large <b>NACA</b> <b>duct</b> works best on flat surfaces parallel to the airflow such as your vehicle's roof. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Kits includes your choice of hood <b>ducting</b>, a <b>NACA</b> <b>Duct</b> or a Low Profile Scoop for the roof, grill screen, and a screw kit - stainless steel only.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.oocrcracing.com /products.htm</font> (433 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.s2ki.com/forums/index.php?showtopic=137034">Forums -> HeCash Brake Ducting System (FYI)</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Cut the <b>NACA</b> <b>ducts</b> using a SAW (they'll split if you try to trim them with sheetmetal scissors!) such that they overlap the outer lip of the faux inlets by an inch or so. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> I used a 2" hole saw on the faux brake <b>duct</b> panels in the bumper and on the dust shields, and a 2.5" hole saw on the fender liner. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> I found some 2" aluminum vent <b>duct</b> flanges that were a perfect fit through the 2" holes and into the hose, and used worm-gear hose clamps to hold the hose onto them.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.s2ki.com /forums/index.php?showtopic=137034</font> (2463 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.revlimiter.net/mods/coldside_intake.html">revlimiter.net - Coldside Intake</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The <b>NACA</b> <b>duct</b> points the air in the right direction and the Coldside sucks it in. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Those that have been here before might remember my N/A <a href="/topics/Intake" title="Intake" class=fl>intake</a> complete with <b>NACA</b> <b>duct</b> and isolator box. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Maybe this will finally silence the folks who say the <b>NACA</b> <b>duct</b> doesn't work for induction...</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.revlimiter.net /mods/coldside_intake.html</font> (994 words)</td></tr>
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<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> We relocated the compressor inlet tube from the ram <b>duct</b> directly underneath the spinner to a <b>NACA</b> <b>duct</b> on the lower left cowling and use the original <b>duct</b> to blow cool air over the oil pan. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> With the <b>NACA</b> <b>duct</b> only at 100 knots IAS and 5000 feet, inlet pressure was 2.5 inches of water, exit pressure was.5 inches in the rear fuselage. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> With only 2 small <b>NACA</b> <b>ducts</b> feeding the heater core and the valve only half open or less, there did not seem to be an explanation of why the heater core was so effective in cooling the engine when the rads were not.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.sdsefi.com /air41.htm</font> (5412 words)</td></tr>
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<tr><td> </td><td colspan=2><u>Cozy</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> PL says the <b>NACA</b> won't work, so there's an incentive right there to use the <b>NACA</b> as the sole source of inlet air for all five (count 'em) heat exchangers at the back of the <a href="/topics/Airplane" title="Airplane" class=fl>airplane</a>. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Once the <b>duct</b> was made, I cut holes in each side for the oil coolers and glassed aluminum mountings brackets to the edges of the holes. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> As I was fitting the finished <b>duct</b> to the cowl and preparing to glass it in place I had a brainwave.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.canardaviation.com /cozy/chap23i.htm</font> (2620 words)</td></tr>
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<tr><td> </td><td colspan=2><a href="http://www.lambolounge.com/Front/Ducts/Air-Ducts.asp">Air Ducts - Lambo Lounge</a></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> If you then complete the <b>duct</b> by adding fiberglass to the bottom or inside of the body, you can 'close-off' the <b>duct</b>. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The shape of the fender (<b>NACA</b>) <b>duct</b> that comes with the IFG body is curved and comes to a point. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> I drew a circle at the end and a line from the circle to the <b>duct</b> opening.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.lambolounge.com /Front/Ducts/Air-Ducts.asp</font> (386 words)</td></tr>
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<tr><td> </td><td colspan=2><u>Spector Racing - Ducting</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> High quality <b>ducting</b> allows teams to manage air around and inside the race car easily and efficiently. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> With neoprene <b>ducting</b> drivers can pipe cool air into the cock pit and other cool areas of the car. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> With the high temperature silicone aircraft <b>ducting</b> teams can pipe air from bumper <b>ducts</b> to brake coolers, oil coolers, and even build forced air <a href="/topics/Intake" title="Intake" class=fl>intakes</a>.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.spectorracing.com /customer/home.php?cat=115</font> (192 words)</td></tr>
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<tr><td> </td><td colspan=2><u>NACA Intake Duct</u> <i>(Site not responding. Last check: 2007-11-06)</i></td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> The <b>NACA</b> <b>Duct</b> has an interesting performance phenomena of minimizing parasitic <a href="/topics/Drag" title="Drag" class=fl>drag</a> (because nothing sticks out into the slipstream), while producing significant pressure at the throat of the <b>duct</b>. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> Most of the research and application is with regard to air <b>ducts</b> and scoops as applied to aircraft and high performance automobile systems. </td></tr>
<tr><td valign=top><img style="margin-top:4px;" src=/images/a.gif></td><td></td><td> We are currently evaluating designs for the <a href="/topics/Intake" title="Intake" class=fl>intake</a> of marine water jet propulsion systems.</td></tr>
<tr><td></td><td colspan=2><font color=gray>www.classxboats.com /htdocs/Jet_Drive_Technology/WMI_Research/NACA_Intake_Duct.shtml</font> (327 words)</td></tr>
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