REFLECTOR:TUNE, STRAIGHT EXHAUST PIPES
Tom Martino
reflector@tvbf.org
Thu, 5 Feb 2004 21:46:08 -0700
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I have six individual pipes. Each one is connected (the usual way with
a flange) to the cylinder, then each one extends straight down,
12-inches. They are rock solid, thick stainless. They are all
independent.
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-----Original Message-----
From: Jim Sower [mailto:canarder@frontiernet.net]=20
Sent: Thursday, February 05, 2004 9:24 PM
To: reflector@tvbf.org
Subject: Re: REFLECTOR:TUNE, STRAIGHT EXHAUST PIPES
=20
Tom,=20
By straight "tuned" exhaust pipes do you mean sticking straight out the
cowl? I saw pictures of a Velocity with what appeared to be a pipe from
a 3-into-1 header sticking straight out of the cowl. I would NEVER do
that. Exhaust exiting the airplane that way creates "rooster tail" drag
that is the rough equivalent of having the pipe sticking out a foot or
two from the airplane. That's a LOT of drag. I would be inclined to
find out if the guy who made the 3-into-1 pipes that went out the back
still had his jigs and get some of those. Shirl Dickey went NUTS for
over a year trying to track down some hideous vibration in his E-Racer
and found out it was exhaust pulses from the stub pipes from his V-8
routed straight through the cowl going through the prop.=20
Tom Martino wrote:=20
I ordered and received six straight, 12-inch, tuned exhaust
pipes - stainless, with a generous flange and a reinforced collar. I
have talked to a few structural welders for ideas of brackets to tie
them to the engine. Each one of them examined the installation and told
me they wouldn't do anything. They said I should just let them hang
(with the exception of a safety cable on each, in case they broke away.
Their reasoning is this:The exhaust tubes become part of the
engine.They will move and vibrate with the engine and a 12" extension
does not hang down far enough to create a mechanical "disadvantage".They
say if I tie them to the engine, I could actually create a weak spot,
causing it to stress at that point.=20
I am not a welder, nor have I had personal experience with
straight pipes hanging 12 inches off of an engine.Can I get some
feedback? =20
I plan on using a safety cable but should I go further?
--=20
Jim Sower ... Destiny's Plaything=20
Crossville, TN; Chapter 5=20
Long-EZ N83RT, Velocity N4095T=20
=20
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<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'>I have six individual pipes.<span
style=3D'mso-spacerun:yes'> </span>Each one is connected (the =
usual way with a
flange) to the cylinder, <span class=3DGramE>then</span> each one =
extends straight
down, 12-inches.<span style=3D'mso-spacerun:yes'> </span>They are =
rock solid,
thick stainless.<span style=3D'mso-spacerun:yes'> </span>They are =
all
independent.<o:p></o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
style=3D'font-size:
10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal><font size=3D2 color=3Dnavy face=3DArial><span =
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<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DTahoma><span
style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----<br>
<b><span style=3D'font-weight:bold'>From:</span></b> Jim Sower
[mailto:canarder@frontiernet.net<span class=3DGramE>] <br>
<b><span style=3D'font-weight:bold'>Sent</span></b></span><b><span
style=3D'font-weight:bold'>:</span></b> Thursday, February 05, 2004 9:24 =
PM<br>
<b><span style=3D'font-weight:bold'>To:</span></b> =
reflector@tvbf.org<br>
<b><span style=3D'font-weight:bold'>Subject:</span></b> Re: =
REFLECTOR<span
class=3DGramE>:TUNE</span>, STRAIGHT EXHAUST PIPES</span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>Tom, <br>
By straight "tuned" exhaust pipes do you mean sticking =
straight out
the cowl? I saw pictures of a Velocity with what appeared to be a =
pipe
from a 3-into-1 header sticking straight out of the cowl. I would =
NEVER
do that. Exhaust exiting the airplane that way creates =
"rooster
tail" drag that is the rough equivalent of having the pipe sticking =
out a
foot or two from the airplane. That's a LOT of drag. I would =
be
inclined to find out if the guy who made the 3-into-1 pipes that went =
out the
back still had his jigs and get some of those. Shirl Dickey went =
NUTS for
over a year trying to track down some hideous vibration in his E-Racer =
and
found out it was exhaust pulses from the stub pipes from his V-8 routed
straight through the cowl going through the prop. =
<o:p></o:p></span></font></p>
<p style=3D'margin-left:.5in'><font size=3D3 face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt'>Tom Martino wrote: =
<o:p></o:p></span></font></p>
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<div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'>I ordered and received six =
straight,
12-inch, tuned exhaust pipes – stainless, with a generous flange =
and a
reinforced collar. I have talked to a few structural welders for =
ideas of
brackets to tie them to the engine. Each one of them examined the
installation and told me they wouldn’t do anything. They said =
I
should just let them hang (with the exception of a safety cable on each, =
in
case they broke away.<u3:p></u3:p></span></font><o:p></o:p></p>
</div>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><u3:p></u3:p>Their =
reasoning is
this:The exhaust tubes become part of the engine.They will move and =
vibrate
with the engine and a 12” extension does not hang down far enough =
to
create a mechanical “disadvantage”.They say if I tie them to =
the
engine, I could actually create a weak spot, causing it to stress at =
that point.<u3:p></u3:p></span></font>
<o:p></o:p></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D2 =
face=3DArial><span
style=3D'font-size:10.0pt;font-family:Arial'><u3:p></u3:p>I am not a =
welder, nor
have I had personal experience with straight pipes hanging 12 inches off =
of an
engine.Can I get some feedback? <u3:p></u3:p></span></font> =
<o:p></o:p></p>
<p class=3DMsoNormal style=3D'margin-left:.5in'><u3:p></u3:p><font =
size=3D3
face=3D"Times New Roman"><span style=3D'font-size:12.0pt'>I plan on =
using a safety
cable but should I go further?<u3:p></u3:p><o:p></o:p></span></font></p>
</blockquote>
<p style=3D'margin-left:.5in'><font size=3D3 face=3D"Times New =
Roman"><span
style=3D'font-size:12.0pt'>-- <br>
Jim Sower ... Destiny's Plaything <br>
Crossville, TN; Chapter 5 <br>
Long-EZ N83RT, Velocity N4095T <br>
<o:p></o:p></span></font></p>
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