Everyone thinks 9 degrees out is too much, but no one knows for sure because no one has tried it. Well, I'm going to know soon because I'm going to put in the out thrust, shut 1 engine down and fly at full power. Then I can see the yaw one way or the other. By changing the Ernst thrust plates, I can vary the thrust line from 1 degree in to 11 degrees out. That ought to let me figure out the exact amount.

Normally I would not fly single engine at full power with a rectangular wing and normally spaced engines, but I wanted to see if I could without much, or any, rudder. I will say that I have lost both sides on my Twin Air and I remember that at half power, havng the right engine out is much easier to control than having the left one out. This probably means the out thrust required is not the same on either side. I assume torque, p-factor, etc. Only flight tests will tell. I'll be publishing the results in R/C Report.