[NSRCA-discussion] C'ARF Integral - Mixing secret?

[Woodward, Jim R (US SSA)]

Hi Guys, - Integral owners,

This weekend I helped out a friend fly his newly acquired Integral and the plane has some surprising tendencies.  I have never flown a plane that had such severe throttle to rudder mixing needed.  When throttle is reduced there is a dramatic yaw to the right.  This symptom starts taking place from 1/3 throttle to idle.  Above ½ the plane starts to fly normal.  On a vertical downline (idle, no throttle to rudder mix), the plane will actually attempt to yaw out of the downline.  Other noted times - when performing a simple ½ reverse Cuban and coming around the back with just a little bit of power, the plane dramatically yaws to the right.

For my 4 flights on the plane over two days (plus watching him fly) and recognizing this bizarre tendency was occurring relatively high on the throttle stick, I input a Throttle to Left Rudder mix.  This mix is at 12% Linear (using JR 12X).  12% takes 90% of the bad problem away.  Throttle curve is nice.  .

>From ½ throttle up the plane flies pretty nice and has very little pitch or roll coupling for knife edge.  CG seems very good.  The motor mount and nose-ring are tight.  The YS and 19x11 combo work great. Rudder trim appears to be normal.  There is no obvious sign or reason for this weird trait

Have any other Integral owners seen this severe yaw when power is reduced?  In all my other planes if I had EVER considered a throttle to rudder mix is was on the order of 2% - certainly not +10% mix.

Thanks,
Jim W.

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