REFLECTOR:NACA inlet shape
Alexander Balic
reflector@tvbf.org
Fri, 15 Aug 2003 18:01:18 -0500
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Re: REFLECTOR:NACA inlet shapeChris,
It is interesting to me that there would be any difference as to what you
are using the captured air for, although there probably would be a
difference in how much pressure ultimately the submerged scoop can generate,
since it is not a direct ram air source, probably after enough back pressure
develops, the inlet becomes "blocked" and further attempts to pressurize the
plenum will just result in the air bypassing the ramp altogether, so
probably. a good radiator scoop might require a ram air source ala P-51 that
moves the opening out of the boundary layer of the fuselage. But I will
certainly try to e NACA first, then change to a ram scoop if I do not get
enough cooling.
Alex
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On Behalf Of
Christopher Barber
Sent: Thursday, August 14, 2003 1:53 PM
To: reflector@tvbf.org
Subject: RE: REFLECTOR:NACA inlet shape
I have seen it expressed though that according to that original research
that NACA scoops are not really suited for application of heat exchange
cooling. I need it to cool a radiator in my application. Those that know
more than I seem adamant that they do not work well (even making reference
to an alleged Velocity builder/flyer who hates them). However, it seems as
if Velocity, Inc. overall has had good results. Any of you engineering (or
programmers, or burger flippers etc) types have any thoughts on this.
Thanks for your insight and experience.
All the best,
Chris
Christopher Barber
Attorney and Counselor at Law
11930 S Sam Houston Pkwy E
Suite 103
Houston, Texas 77089-4755
281-464-LAWS (5297)
281-754-4168 (Fax)
"Serving the needs of Senior Texans"
CBarber@TexasAttorney.net
www.TexasAttorney.net
-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
Behalf Of Tony Babb
Sent: Tuesday, August 12, 2003 7:41 PM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:NACA inlet shape
For the real enthusiast you can download the original NACA research
paper written in 1945. I'm not at home and don't have the reference but if
you go to www.larc.nasa.gov and then search their archive you should be able
to find it OK. The file is called naca-acr-5120.pdf it's about 12MB, title
is "An experimental investigation of NACA submerged-duct entrances".
In there you'll find recommendations for the shape of the duct and also
the shape of the lip on the wide end of the duct.
Fascinating stuff..
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<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=994495422-15082003>Chris,</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=994495422-15082003>It is interesting to me that there would be any
difference as to what you are using the captured air for, although
there probably would be a difference in how much pressure ultimately
the submerged scoop can generate, since it is not a direct ram air source,
probably after enough back pressure develops, the inlet becomes "blocked"
and further attempts to pressurize the plenum will just result in the air
bypassing the ramp altogether, so</SPAN> <SPAN
class=994495422-15082003> probably. a good radiator scoop might
require a ram air source ala P-51 that moves the opening out of the boundary
layer of the fuselage. But I will certainly try to e NACA first, then change to
a ram scoop if I do not get enough cooling.</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=994495422-15082003></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=994495422-15082003>Alex</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=994495422-15082003></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=994495422-15082003></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=994495422-15082003> </SPAN></FONT></FONT></FONT><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> reflector-admin@tvbf.org
[mailto:reflector-admin@tvbf.org]<B>On Behalf Of </B>Christopher
Barber<BR><B>Sent:</B> Thursday, August 14, 2003 1:53 PM<BR><B>To:</B>
reflector@tvbf.org<BR><B>Subject:</B> RE: REFLECTOR:NACA inlet
shape<BR><BR></DIV></FONT>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV><SPAN class=763253819-14082003><FONT face=Garamond color=#0000ff>I have
seen it expressed though that according to that original research that NACA
scoops are not really suited for application of heat exchange cooling. I
need it to cool a radiator in my application. Those that know more than I seem
adamant that they do not work well (even making reference to an alleged
Velocity builder/flyer who hates them). However, it seems as if Velocity,
Inc. overall has had good results. Any of you engineering (or
programmers, or burger flippers etc) types have any thoughts on
this. </FONT></SPAN></DIV>
<DIV><SPAN class=763253819-14082003><FONT face=Garamond
color=#0000ff></FONT></SPAN> </DIV>
<DIV><SPAN class=763253819-14082003><FONT face=Garamond color=#0000ff>Thanks
for your insight and experience.</FONT></SPAN></DIV>
<DIV><SPAN class=763253819-14082003><FONT face=Garamond
color=#0000ff></FONT></SPAN> </DIV>
<DIV><SPAN class=763253819-14082003><FONT face=Garamond color=#0000ff>All the
best,</FONT></SPAN></DIV>
<DIV><SPAN class=763253819-14082003><FONT face=Garamond
color=#0000ff></FONT></SPAN> </DIV>
<DIV><SPAN class=763253819-14082003><FONT face=Garamond
color=#0000ff>Chris</FONT></SPAN></DIV>
<DIV> </DIV>
<P><FONT size=2>Christopher Barber<BR>Attorney and Counselor at Law<BR>11930 S
Sam Houston Pkwy E<BR>Suite 103<BR>Houston, Texas 77089-4755<BR>281-464-LAWS
(5297)<BR>281-754-4168 (Fax)<BR><BR>"Serving the needs of Senior
Texans"<BR><BR>CBarber@TexasAttorney.net<BR>www.TexasAttorney.net </FONT></P>
<BLOCKQUOTE dir=ltr style="MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> reflector-admin@tvbf.org
[mailto:reflector-admin@tvbf.org]<B>On Behalf Of </B>Tony
Babb<BR><B>Sent:</B> Tuesday, August 12, 2003 7:41 PM<BR><B>To:</B>
reflector@tvbf.org<BR><B>Subject:</B> Re: REFLECTOR:NACA inlet
shape<BR><BR></FONT></DIV>
<DIV><FONT face=Arial size=2>For the real enthusiast you can download the
original NACA research paper written in 1945. I'm not at home and don't have
the reference but if you go to <A
href="http://www.larc.nasa.gov">www.larc.nasa.gov</A> and then search their
archive you should be able to find it OK. The file is called
naca-acr-5120.pdf it's about 12MB, title is "An experimental investigation
of NACA submerged-duct entrances".</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>In there you'll find recommendations for the
shape of the duct and also the shape of the lip on the wide end of the
duct. </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Fascinating
stuff..</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>
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