B.J. Park recently sent me his thoughts on setting Throttle to Rudder mix on the BiSide. As I mentioned previously, you should install the motor so that it matches the nose ring. That sets the proper thrust angles. After flying it, you will see that it will need some throttle to rudder mix in order to track perfectly.

B.J. said that you really can't tweak the attitude of the plane by adding thrust. In experimenting with the plane, he added up to 5 degrees of right thust and it had no affect on normal flight but it went to the right in a power-off vertical downline. This showed that thrust adjustment was not the way to do it, and that the airplane should be set with the original thrust setting.

I followed his suggestion on my original BiSide and I set the trim of the plane for hands off straight & level flight at full throttle. Then I adjusted throttle to rudder mix at various throttle settings to get it dialed in. That process took me a while to get it right.

B.J. sent me a better process for setting this up. Here's the process he sent me. I tried it and, although I am not totally finished with it, it is much easier and faster than what I did:

1. Take the plane as high as you can, then go into a vertical dive with throttle at idle and with the belly or canopy facing you. If you are using a motor brake setting, then make sure that it is enabled. Adjust the rudder trim so that it is heading perfectly straight down. This took several clicks of left trim on my plane. B.J. says that this is the perfect rudder trim for the plane, aerodynamically and geometrically.

2. Now that you have established the idle downline trim, you need to set the throttle to rudder mix points. First, set the horizontal flight mix with the plane at mid throttle. Set the rudder mix point at this throttle setting so that it is flying straight on a horizontal line. Next, set mixing on vertical uplines at 75% and 100% throttle positions.

You will notice that the mixing is not linear. I used a LINE mix on my 18mz and the mix at mid throttle is about half that at full throttle. I am still working this a bit, so the values may change. I'll post a pic of the curve when I am finished with setting it up.

I was able to get it pretty dialed in in one afternoon, so I was pretty happy with the way it went. Originally, it took me several flying sessions to dial in the rudder to where I liked it.