The BCMA 40 will put out 20 pounds of static thrust once broken in with a Xoar 20X8 prop. That's only two more then the 160 did. I bought the 40 for another plane but it turned out to be unsuitable for it so I put it into the CAP for the torque. The rudder requires two servos when you move them to the back. I'm running about 160oz in in each one.