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<title>Re: [NSRCA-discussion] Wind tunnel</title>
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<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'>I don’t know about smoke generators
but I do know that the air is “pulled” over the surface. Wouldn’t
you need a clear cowl to se how it flows around the engine? Or perhaps some miniature
pressure sensors?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span style='font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Tahoma><span
style='font-size:10.0pt;font-family:Tahoma'>-----Original Message-----<br>
<b><span style='font-weight:bold'>From:</span></b>
nsrca-discussion-bounces@lists.nsrca.org [mailto:nsrca-discussion-bounces@lists.nsrca.org]
<b><span style='font-weight:bold'>On Behalf Of </span></b>Earl Haury<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, January 23, 2007
2:53 PM<br>
<b><span style='font-weight:bold'>To:</span></b> NSRCA Mailing List<br>
<b><span style='font-weight:bold'>Subject:</span></b> Re: [NSRCA-discussion]
Wind tunnel</span></font></p>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>I experimented with looking at
cooling air flow using smoke with limited success. Airflow can be simulated with
fans & cardboard flow straighteners / aircraft prop - motor (be careful) -
and even leaf blowers / shop vac exits with varying degrees of success. A mini
- webcam mounted in a fuselage (with lighting) provides some view of smoke flow
inside a closed fuse.</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>However - making enough non -
corrosive or non - oily smoke (at a reasonable price) is an issue. Most
of the smoke "wands" produce a corrosive element in the smoke.
Most of the smoke generators produce an oily smoke that leaves an oily
residue. I don't want either in my airplane / equipment. </span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<div>
<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>The best I found are smoke
"pens" used in the HVAC service industry - they consist of a wax
impregnated wick that smokes similar to an extinguished birthday candle.
Unfortunately, the amount of smoke is limited and becomes diluted (invisible)
at the airflows we'd like to investigate. These were useful in determining the
shape / edge of air inlets so that minimum air was diverted around the inlets.</span></font><o:p></o:p></p>
</div>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'> <o:p></o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>Earl</span></font><o:p></o:p></p>
</div>
<blockquote style='border:none;border-left:solid black 1.5pt;padding:0in 0in 0in 3.0pt;
margin-left:3.0pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'>
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<p class=MsoNormal style='margin-left:.5in'><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial'>----- Original Message ----- <o:p></o:p></span></font></p>
</div>
<div style='font-color:black'>
<p class=MsoNormal style='margin-left:.5in;background:#E4E4E4'><b><font size=2
face=Arial><span style='font-size:10.0pt;font-family:Arial;font-weight:bold'>From:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:atwoodm@paragon-inc.com" title="atwoodm@paragon-inc.com">Mark
Atwood</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>To:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> <a
href="mailto:nsrca-discussion@lists.nsrca.org"
title="nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</a> <o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Sent:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Tuesday,
January 23, 2007 1:26 PM<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><font size=2 face=Arial><span
style='font-size:10.0pt;font-family:Arial;font-weight:bold'>Subject:</span></font></b><font
size=2 face=Arial><span style='font-size:10.0pt;font-family:Arial'> Re:
[NSRCA-discussion] Wind tunnel<o:p></o:p></span></font></p>
</div>
<div>
<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
</div>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=1 face=Verdana><span style='font-size:7.0pt;
font-family:Verdana'>I speak from VERY limited experience, however the simple
version appears to be to “pull” the air over the surface rather
than push it. They used a large fan to evacuate the room and provided
small controlled inlets for air to enter and flow over the surface. The
smoke is simply from colored smoke sticks, though I’m not sure of the
source of those. <br>
<br>
I’m curious though how representative that is of the actual
“Flow” over the object. <br>
<br>
<br>
On 1/23/07 2:17 PM, "J.Oddino" <joddino@socal.rr.com> wrote:</span></font><o:p></o:p></p>
<p class=MsoNormal style='mso-margin-top-alt:0in;margin-right:0in;margin-bottom:
12.0pt;margin-left:.5in'><font size=1 face=Arial><span style='font-size:7.0pt;
font-family:Arial'>Anyone know what they use in those automobile ads that shows
how the air flows over their slick streamlined cars?<br>
I was thinking one might determine what the cooling airflow looked like around
and through our electric motors.<br>
</span></font><font size=1 face=Verdana><span style='font-size:7.0pt;
font-family:Verdana'><br>
</span></font><font size=1 face=Arial><span style='font-size:7.0pt;font-family:
Arial'>Jim O</span></font><font size=1 face=Verdana><span style='font-size:
7.0pt;font-family:Verdana'><o:p></o:p></span></font></p>
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<hr size=3 width="95%" align=center>
</span></font></div>
<p class=MsoNormal style='margin-left:.5in'><font size=1 face="Courier New"><span
style='font-size:6.0pt;font-family:"Courier New"'>_______________________________________________<br>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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<p class=MsoNormal style='margin-left:.5in'><font size=3 face="Times New Roman"><span
style='font-size:12.0pt'>_______________________________________________<br>
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