REFLECTOR:MORE ON COMBUSTION AIR AND COOLING
John Tvedte
reflector@tvbf.org
Mon, 15 Sep 2003 15:48:14 -0500
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Jack,
=20
Do you have any pictures of your install? It's not obvious to me from
the airflow site..... :-)
=20
Thanks,
=20
John
=20
-----Original Message-----
From: Jack Sheehan [mailto:j.f.sheehan@issmail.larc.nasa.gov]=20
Sent: Monday, September 15, 2003 11:49 AM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:MORE ON COMBUSTION AIR AND COOLING
=09
=09
Tony,
I had the same concerns about using the cooling air from the
NACA as well as a concern about operating on the ground with unfiltered
air.
I placed an intake air scoop under the aircraft. it is attached
to the lower cowling. If I was doing it again I would design it so that
it was part of the fuselage and remain in place when cowling is removed.
I used an alternate air assembly from airflow performance
http://www.airflowperformance.com/airframe.htm
This unit comes with a K&N air filter attached to the alternate
flow assembly. I have a push -pull cable which operates the butterfly in
the assembly. The selection is for either filtered air which is thru the
filter inside the cowling under the engine or Ram air which comes from
the air scoop. The filter is a cone type like those used on off-road or
other injected engines. so it does not have a box or anything it simply
attaches to the assembly. The difference between filtered air and Ram
Air in flight is about 1" MP at about 10,000 feet. This
solution solved both my concerns and additionally provides heated air
from the engine compartment in the event you find yourself in some
frozen precip and you choose not to use the Ram Air to prevent ice
entering the servo. Other folks have manufactured similar types of
scoops and filter arrangements but I liked the idea of having a nice
machined part attached to the engine with no worries about filters being
blocked or other parts being ingested into the engine. The assembly
costs a few bucks but I thought it was a good solution
Jack
N55XL
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<DIV><SPAN class=3D412184720-15092003><FONT face=3DArial color=3D#0000ff =
size=3D2>Jack,</FONT></SPAN></DIV>
<DIV><SPAN class=3D412184720-15092003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D412184720-15092003><FONT face=3DArial color=3D#0000ff =
size=3D2>Do you=20
have any pictures of your install? It's not obvious to me from the =
airflow=20
site..... :-)</FONT></SPAN></DIV>
<DIV><SPAN class=3D412184720-15092003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D412184720-15092003><FONT face=3DArial color=3D#0000ff =
size=3D2>Thanks,</FONT></SPAN></DIV>
<DIV><SPAN class=3D412184720-15092003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<DIV><SPAN class=3D412184720-15092003><FONT face=3DArial color=3D#0000ff =
size=3D2>John</FONT></SPAN></DIV>
<DIV><SPAN class=3D412184720-15092003><FONT face=3DArial color=3D#0000ff =
size=3D2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=3Dltr style=3D"MARGIN-RIGHT: 0px">
<DIV></DIV>
<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr =
align=3Dleft><FONT=20
face=3DTahoma size=3D2>-----Original Message-----<BR><B>From:</B> Jack =
Sheehan=20
[mailto:j.f.sheehan@issmail.larc.nasa.gov] <BR><B>Sent:</B> Monday, =
September=20
15, 2003 11:49 AM<BR><B>To:</B> reflector@tvbf.org<BR><B>Subject:</B> =
Re:=20
REFLECTOR:MORE ON COMBUSTION AIR AND COOLING<BR><BR></FONT></DIV>
<DIV><FONT face=3DArial size=3D-1>Tony,</FONT></DIV>
<DIV><FONT face=3DArial size=3D-1>I had the same concerns about using =
the cooling=20
air from the NACA as well as a concern about operating on the ground =
with=20
unfiltered air.</FONT></DIV>
<DIV><FONT face=3DArial size=3D-1>I placed an intake air scoop under =
the aircraft.=20
it is attached to the lower cowling. If I was doing it again I would =
design it=20
so that it was part of the fuselage and remain in place when cowling =
is=20
removed.</FONT></DIV>
<DIV><FONT face=3DArial size=3D-1>I used an alternate air assembly =
from airflow=20
performance =
http://www.airflowperformance.com/airframe.htm</FONT></DIV>
<DIV><FONT face=3DArial size=3D-1>This unit comes with a K&N air =
filter=20
attached to the alternate flow assembly. I have a push -pull cable =
which=20
operates the butterfly in the assembly. The selection is for either =
filtered=20
air which is thru the filter inside the cowling under the engine or =
Ram air=20
which comes from the air scoop. The filter is a cone type like those =
used on=20
off-road or other injected engines. so it does not have a box or =
anything it=20
simply attaches to the assembly. The difference between filtered air =
and Ram=20
Air in flight is about =
1"=20
MP at about 10,000 feet. This solution solved both my =
concerns and=20
additionally provides heated air from the engine compartment in the =
event you=20
find yourself in some frozen precip and you choose not to use the Ram =
Air to=20
prevent ice entering the servo. Other folks have manufactured similar =
types of=20
scoops and filter arrangements but I liked the idea of having a nice =
machined=20
part attached to the engine with no worries about filters being =
blocked or=20
other parts being ingested into the engine. The assembly costs a few =
bucks but=20
I thought it was a good solution</FONT></DIV>
<DIV><FONT face=3DArial size=3D-1>Jack</FONT></DIV>
<DIV><FONT face=3DArial =
size=3D-1>N55XL</FONT></DIV></BLOCKQUOTE></BODY></HTML>
=00
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