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Message-ID: <63163d560705022110q41ad07of032cecd8512d9b@mail.gmail.com>
Date: Wed, 2 May 2007 23:10:01 -0500
From: "Thomas Jakits" <rotary.thjakits@gmail.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Throttle body size/ other "Paul" issues
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You are right, the text I quoted mentions boundary-layer thickness as an
important factor.
Though before I would glue VG's (howitzer) on the plane I'd try turbolator
tape or sanding with 350 or 400 lengthwise in front of the inlet . Anything
to energize the flow and thin out the b-layer.

This may be another easy test for Ed - reversible too!
Ed, try turbolator tape inside your ducts starting at some point and moving
1/4" wise around from it.
If you hit the right spot, separation should be delayed, flow more
efficient, cooler tems.
Then you close the cowl-flaps and run faster!
Another one would be to sand the inner surfaces lengthwise towards the
radiator - should "streamline" and energize the boundary-flow - sometimes
"as smooth as possible" is NOT the best way :)

TJ


On 5/2/07, marv@lancair.net <marv@lancair.net> wrote:
>
> I remember visiting a Velocity project a number of years ago that had a
> well-constructed NACA duct in an improper location and it simply didn't do
> the job.  Rather than close it off and relocate it the builder installed a
> row of vortex generators in front of the duct about as far away as the duct
> was wide and it then worked like a charm.  Perhaps not the most elegant
> solution but another case for more than one way to skin the proverbial cat.
> FWIW.
>
>    <Marv>
>
>
>  "Thomas Jakits" <rotary.thjakits@gmail.com> wrote:
>
> """
> just recently read about the Naca:
>
> It can work VERY WELL, *IF*
> a) You have the right location
> ...snip...
> """
>
>
>
> --
>
> Homepage:  http://www.flyrotary.com/
>
> Archive and UnSub:   http://mail.lancaironline.net:81/lists/flyrotary/List.html
>
>

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<div>You are right, the text I quoted mentions boundary-layer thickness as an important factor.</div>
<div>Though before I would glue VG&#39;s (howitzer)&nbsp;on the plane I&#39;d try turbolator tape or sanding with 350 or 400 lengthwise in front of the inlet . Anything to energize the flow and thin out the b-layer.</div>
<div>&nbsp;</div>
<div>This may be another easy test for Ed - reversible too!</div>
<div>Ed, try&nbsp;turbolator tape inside your ducts starting at some point and moving 1/4&quot; wise around from it.</div>
<div>If you hit the right spot, separation should be delayed, flow more efficient, cooler tems.</div>
<div>Then you close the cowl-flaps and run faster!</div>
<div>Another one would be to sand the inner surfaces lengthwise towards the radiator - should &quot;streamline&quot; and energize the boundary-flow - sometimes &quot;as smooth as possible&quot; is NOT the best way :)</div>

<div>&nbsp;</div>
<div>TJ<br><br>&nbsp;</div>
<div><span class="gmail_quote">On 5/2/07, <b class="gmail_sendername"><a href="mailto:marv@lancair.net">marv@lancair.net</a></b> &lt;<a href="mailto:marv@lancair.net">marv@lancair.net</a>&gt; wrote:</span>
<blockquote class="gmail_quote" style="PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: #ccc 1px solid">
<div style="FONT: 10pt arial,helvetica,sans-serif">I remember visiting a Velocity project a number of years ago that had a well-constructed NACA duct in an improper location and it simply didn&#39;t do the job.&nbsp; Rather than close it off and relocate it the builder installed a row of vortex generators in front of the duct about as far away as the duct was wide and it then worked like a charm.&nbsp; Perhaps not the most elegant solution but another case for more than one way to skin the proverbial cat.&nbsp; FWIW.
<br><br>&nbsp;&nbsp; &lt;Marv&gt;<span class="q"><br><br><br>&nbsp;&quot;Thomas Jakits&quot; &lt;<a onclick="return top.js.OpenExtLink(window,event,this)" href="mailto:rotary.thjakits@gmail.com" target="_blank">rotary.thjakits@gmail.com
</a>&gt; wrote:<br><br>&quot;&quot;&quot;<br>just recently read about the Naca:<br><br>It can work VERY WELL, *IF*<br>a) You have the right location<br></span>...snip...<br>&quot;&quot;&quot;<br><br>&nbsp;</div>
<div><span class="e" id="q_112500b1fde983e7_3">
<p><pre>--

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</pre>
<p></p></p></span></div></blockquote></div><br>

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