I'm not trying to be hard on the man, my whole point is that this isn't an aeronautical engineering forum, it's a beginners forum. A few of us (me included--I was first) gave the man a decent answer, one that would have sufficed in the real world--with our models. I didn't realize at first that it was a life or death issue to differentiate between P factor and torque. I will defer all further thrust offset questions to those who know....