<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>Re: [NSRCA-discussion] Wind tunnel</TITLE>
<META http-equiv=Content-Type content="text/html; charset=iso-8859-1">
<META content="MSHTML 6.00.5730.11" name=GENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=#ffffff>
<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>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. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>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.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Earl</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=atwoodm@paragon-inc.com href="mailto:atwoodm@paragon-inc.com">Mark
Atwood</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A
title=nsrca-discussion@lists.nsrca.org
href="mailto:nsrca-discussion@lists.nsrca.org">NSRCA Mailing List</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, January 23, 2007 1:26
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: [NSRCA-discussion] Wind
tunnel</DIV>
<DIV><BR></DIV><FONT face="Verdana, Helvetica, Arial"><SPAN
style="FONT-SIZE: 12px">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:<BR><BR></SPAN></FONT>
<BLOCKQUOTE><SPAN style="FONT-SIZE: 12px"><FONT face=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></FONT><FONT face="Verdana, Helvetica, Arial"><BR></FONT><FONT
face=Arial>Jim O<BR></FONT><FONT face="Verdana, Helvetica, Arial"><BR>
<HR align=center width="95%" SIZE=3>
</FONT></SPAN><FONT size=2><FONT face="Monaco, Courier New"><SPAN
style="FONT-SIZE: 10px">_______________________________________________<BR>NSRCA-discussion
mailing list<BR>NSRCA-discussion@lists.nsrca.org<BR><A
href="http://lists.nsrca.org/mailman/listinfo/nsrca-discussion">http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</A><BR></SPAN></FONT></FONT></BLOCKQUOTE><FONT
size=2><FONT face="Monaco, Courier New"><SPAN
style="FONT-SIZE: 10px"><BR></SPAN></FONT></FONT>
<P>
<HR>
<P></P>_______________________________________________<BR>NSRCA-discussion
mailing
list<BR>NSRCA-discussion@lists.nsrca.org<BR>http://lists.nsrca.org/mailman/listinfo/nsrca-discussion</BLOCKQUOTE></BODY></HTML>