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From: "Al Gietzen" <ALVentures@cox.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
Subject: RE: [FlyRotary] Re: Stoich A/F Ratio?? : [FlyRotary] Re: where's the missing power?
Date: Tue, 20 Oct 2009 10:33:26 -0800
Message-ID: <8C28CA3868704368B1CB5704C11EA2EA@BigAl>
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The answers I got indicated that if you were at stoich at 12:00 oclock, =
then
best power should be around 1:00-2:00 oclock. =20
=20
Bill;
I'm going to modify my earlier response based on more careful attention =
when
flying the other day. I monitored (average) EGTs rather than looking at =
the
O2 sensor readout. Mine is set for peak EGT at about 1:30 position (is =
that
stoichometric?). About 100F lean of peak puts the knob at about 11:00
position; about 100F ROP is about 4:00-4:30 position. Note frequent use =
of
"about".
=20
This varies somewhat depending on MAP due to variations in the =
correction
factors.
=20
YMMV;
=20
Al G - Velocity 20B
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<blockquote style=3D'border:none;border-left:solid black =
1.5pt;padding:0in 0in 0in 4.0pt;
margin-left:3.75pt;margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt'=
>
<p class=3DMsoNormal style=3D'margin-left:.5in'><font size=3D3 =
face=3D"Times New Roman"><span
style=3D'font-size:12.0pt'>The answers I got indicated that if you were =
at stoich
at </span></font>12:00 oclock, then best power should be around =
1:00-2:00 oclock. </p>
<p class=3DMsoNormal><font size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:
11.0pt;font-family:Verdana;color:blue'> </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'>Bill;</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'>I’m going to modify my =
earlier
response based on more careful attention when flying the other day. =
I
monitored (average) EGTs rather than looking at the O2 sensor readout. =
Mine
is set for peak EGT at about </span></font><font size=3D2 color=3Dblue
face=3DVerdana><span =
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>1:30</span></fo=
nt><font
size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:11.0pt;font-family:Verdana;
color:blue'> position (is that stoichometric?). About 100F lean of =
peak
puts the knob at about </span></font><font size=3D2 color=3Dblue =
face=3DVerdana><span
=
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>11:00</span></f=
ont><font
size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:11.0pt;font-family:Verdana;
color:blue'> position; about 100F </span></font><font size=3D2 =
color=3Dblue
face=3DVerdana><span =
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>ROP</span></fon=
t><font
size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:11.0pt;font-family:Verdana;
color:blue'> is about </span></font><font size=3D2 color=3Dblue =
face=3DVerdana><span
=
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'>4:00-4:30</span=
></font><font
size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:11.0pt;font-family:Verdana;
color:blue'> position. Note frequent use of =
“about”.</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'> </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'>This varies somewhat depending on =
</span></font><font
size=3D2 color=3Dblue face=3DVerdana><span =
style=3D'font-size:11.0pt;font-family:Verdana;
color:blue'>MAP</span></font><font size=3D2 color=3Dblue =
face=3DVerdana><span
style=3D'font-size:11.0pt;font-family:Verdana;color:blue'> due to =
variations in
the correction factors.</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'> </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'>YMMV;</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'> </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 G - Velocity =
20B</span></font></p>
</blockquote>
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