RE: Anti Yaw Device
So your Hog will provide a really good test vehicle.
BTW, they all turn left on takeoff if you push the throttle too fast.
It's because the prop is working great but everything else isn't yet or just barely getting started. The fin/rudder have barely got their usual power. It comes with airspeed and there isn't much, and what airspeed they're seeing is coming from the propblast on one side.
But the weight is an idea that's not universally preached. It will be interesting to hear other's observations of it. And of course, everyone with a sidemounted engine will have seen something of the effect.