REFLECTOR:540 engine prices

Tue, 4 Nov 2003 11:17:57 -0800

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Robin asked:

The question I have on exhaust, since you are way ahead of me here is
why you did a rear exit rather than an "S" curve and a front exit.  Is
there just too little room for the extra piece of pipe, the three pound
weight penalty, or the mechanical problem of safely hanging the forward
facing exhaust that directed your decision?

The simplest approach would be simply going down and out from my
tangential muffler/manifold.  Not doing so is strictly my emphasis on
drag reduction and efficiency.  Any exhaust going out perpendicular to
free stream represents drag, and if you're sending the heated exhaust
gases through the prop, you'd like to do it as close to the hub as
possible for minimum effect on prop efficiency.  Fine points; it is
true.  I have also made a new cowling without the 'bumps' on the side to
get cleaner airflow to the prop.  And moving the prop back 6" with the
extension also gets it back further from the wing wake.  You know; a
little here, a little there . . . 

Al

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<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblue
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:blue'>Robin asked:</span></font></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblue
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:blue'>&nbsp;</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'>The question I have on exhaust, since you are =
way
ahead of me here is why you did a rear exit rather than an &quot;S&quot; =
curve
and a front exit.&nbsp; Is there just too little room for the extra =
piece of
pipe, the three pound weight penalty, or the mechanical problem of =
safely
hanging the forward facing exhaust that directed your =
decision?</span></font></p>

</div>

<div>

<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
color=3Dblue
face=3D"Times New Roman"><span =
style=3D'font-size:12.0pt;color:blue'>&nbsp;</span></font></p>

The simplest approach would be =
simply
going down and out from my tangential muffler/manifold. &nbsp;Not doing =
so is
strictly my emphasis on drag reduction and efficiency.&nbsp; Any exhaust =
going
out perpendicular to free stream represents drag, and if you&#8217;re =
sending
the heated exhaust gases through the prop, you&#8217;d like to do it as =
close
to the hub as possible for minimum effect on prop efficiency.&nbsp; Fine
points; it is true.&nbsp; I have also made a new cowling without the =
&#8216;bumps&#8217;
on the side to get cleaner airflow to the prop.&nbsp; And moving the =
prop back
6&#8221; with the extension also gets it back further from the wing =
wake.&nbsp;
You know; a little here, a little there . . .

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>&nbsp;</span></font></p>

<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'>Al</span></font></p>

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