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Patrick,
<BR>What you're experiencing is known as "adverse roll couple"! You can
prove this just by flying right side up and applying full rudder deflection
in either direction and you will see that the airplane will roll in the
opposite direction to whatever rudder you are applying.The cause of the
phenomenon is that the wing is located too far below the Datum line without
sufficient dihedral to compensate for the offset. Aside from trimming it
out with your radio, the only alternative is to saw the wing in half and
adding the correct amount of dihedral which is the better alternative to
achieving a correctly neutral flying airplane. However you will still have
to deal with the pitch condition and if you decide to do whats aerodynamically
required to correct this anomaly you will no longer have an airplane that
you can honestly call a Cap!
<BR>The easiest solution, if you must persist in flying a "scale type"
airplane, is to sell the Cap and buy an Edge, as it has a much better force
arrangement (very close to a neutral flying airplane).
<BR>Georgie
<P>PPandelaers wrote:
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<DIV class="MsoNormal"><SPAN style='font-size:10.0pt;
font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1>Hi
folks,</FONT></FONT></SPAN></DIV>
<P class="MsoNormal"><SPAN style='font-size:10.0pt;
font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1> </FONT></FONT></SPAN>
<P class="MsoNormal"><SPAN lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1>Got
a Cap 232 ARF of some unknown brand “Hype” in </SPAN><SPAN lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Europe</SPAN><SPAN
lang=EN-GB style='font-size:10.0pt;font-family:Arial'>.
Many problems, first of too heavy, wing profile weird but symmetric. High
speed stalls at a blink.</FONT></FONT></SPAN>
<P class="MsoNormal"><SPAN lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1>Size
80” wingspan.</FONT></FONT></SPAN>
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<P class="MsoNormal"><SPAN lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1>Now
the question. Can make it fly pretty good with a DA50, but there’s this
enormous roll-coupling anytime you touch rudder. Also some pulling to the
gear, but nothing unusual.. Best way to test it is to fly knife edge, it
rolls on it’s back in both directions, very quickly! The wing has
NO dihedral. CG is definitely OK, falls nicely straight down on stall turns</FONT></FONT></SPAN>
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<P class="MsoNormal"><SPAN lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1>Thought
first it had to do with dihedral, but in knife edge, the wing doesn’t fly?
What could it have do with it? Tried on simulator AFPD, roll-effect by
lack of dihedral is minor.</FONT></FONT></SPAN>
<P class="MsoNormal"><SPAN lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1>So,
I thought it’s the shape of the rudder, I have to increase the bottom portion.
So I did to a very significant amount, lowering the center (balance of
the surface if you cut it out in cardboard) of the rudder-surface
about 1 “, I noticed some real improvement, but still far from OK. I had
hoped that this much would have reversed the rolling direction. </FONT></FONT></SPAN>
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<P class="MsoNormal"><SPAN lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1>Any
ideas on what I could do? Mixing my radio, 20% rudder to roll, still
way insufficient.</FONT></FONT></SPAN>
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<P class="MsoNormal"><SPAN lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><FONT FACE="Arial"><FONT SIZE=-1>Thx!</FONT></FONT></SPAN>
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<BR><FONT FACE="Arial"><FONT SIZE=-1>Patrick</FONT></FONT></SPAN>
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