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<DIV><FONT face=Arial color=#800000>Given your initial geometry, lowering the
horizontal tailplane puts it in lower in the downwash flow from the wing, where
the downwash is more severe. This effectively makes the h. tailplane AOA a
little more negative,resulting in a need for down elevator trim change to
restore hands-off straight and level flight (assuming the c.g. is aft of the
wing aerodynamic center). This down elevator trim in knife edge will push the
nose toward the belly, i.e., reduce the up elevator mixing you now
have.</FONT></DIV>
<DIV><FONT face=Arial color=#800000></FONT> </DIV>
<DIV><FONT face=Arial color=#800000>Roll coupling in knife edge (assuming a
straight model) is a function of dihedral angle.</FONT></DIV>
<DIV><FONT face=Arial color=#800000></FONT> </DIV>
<DIV><FONT face=Arial color=#800000>Mike Nauman</FONT></DIV>
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