REFLECTOR:MORE ON COMBUSTION AIR AND COOLING
KeithHallsten
reflector@tvbf.org
Mon, 15 Sep 2003 18:29:33 -0700
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Re: REFLECTOR:MORE ON COMBUSTION AIR AND COOLINGJack,
I looked at the Airflow Performance site you referenced and had a hard =
time finding any real information, or even a photo of the part you =
mentioned. I see that they have a regular and "Long" version of their =
"FM-200 Alternate Air Duct Assembly". Is one of those what you are =
using? Do you have any photos or specs? What type of throttle body is =
the assembly connected to? What did that little wonder cost? I'd like =
to find out whether I'm really interested before I get into long =
long-distance phone calls!
Keith Hallsten, XL, IO-540-D4A5 on order
----- Original Message -----=20
From: Jack Sheehan=20
To: reflector@tvbf.org=20
Sent: Monday, September 15, 2003 9:48 AM
Subject: Re: REFLECTOR:MORE ON COMBUSTION AIR AND COOLING
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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COOLING</TITLE>
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<DIV><FONT face=3DArial size=3D2>Jack,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>I looked at the Airflow Performance =
site you=20
referenced and had a hard time finding any real information, or even a =
photo of=20
the part you mentioned. I see that they have a regular and "Long" =
version=20
of their "FM-200 Alternate Air Duct Assembly". Is one of those =
what you=20
are using? Do you have any photos or specs? What type of =
throttle=20
body is the assembly connected to? What did that little wonder =
cost? =20
I'd like to find out whether I'm really interested before I get into =
long=20
long-distance phone calls!</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2>Keith Hallsten, XL, IO-540-D4A5 on=20
order</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<DIV><FONT face=3DArial size=3D2></FONT> </DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
<DIV=20
style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
<A title=3Dj.f.sheehan@issmail.larc.nasa.gov=20
href=3D"mailto:j.f.sheehan@issmail.larc.nasa.gov">Jack Sheehan</A> =
</DIV>
<DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
<DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, September 15, =
2003 9:48=20
AM</DIV>
<DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: REFLECTOR:MORE ON =
COMBUSTION=20
AIR AND COOLING</DIV>
<DIV><BR></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>
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