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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi All,</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I was having a conversation about stab placements with
someone and wanted to gather some opinions. Imagine the following
setup: Main wing is 2.5" below thrust line and at 0.25 degree
positive incidence. Stab is placed 0.5 - 0.75" or so above
main wing, and at zero degrees incidence. Engine down and side thrust are
2 and 2.5 degrees respectively. Knife edge flight requires 10%
up-elevator mix to rudder. CG is set so that when flying inverted, it
requires just a little touch of down elevator (not tail heavy, Inverted 45
degree uplines do fall to earth ever so gently). Plane has 4% aileron to
rudder mix, so that adverse roll couple is removed when flying
knife-edge. </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>"In - General" - if the stab was
lowered to being 0.25-0.5" above the wing CL, would the mix require for
K.E. flight be reduced? If the stab is lowered, would this impact the
adverse roll-couple at all? Or, would raising the wing effectively reduce
the pitch and adverse roll couple?</span></font></p>
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font-family:Arial'> </span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,</span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Jim</span></font></p>
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12.0pt'> </span></font></p>
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